Biostatistics & Population Health

Population health: social determinants of health

Clinical Overview and When to Suspect SDOH Impact

— Economic stability (poverty, employment, food security, housing stability)

— Education access/quality (literacy, early childhood, higher education)

— Health care access/quality (insurance, provider availability, health literacy)

— Neighborhood/built environment (housing quality, transportation, air/water, violence)

— Social/community context (discrimination, incarceration, civic participation, social cohesion)

— Repeated missed appointments or medication non-adherence in a previously engaged patient

— Recurrent hospitalizations for ambulatory-care-sensitive conditions (CHF, asthma, DKA, COPD)

— Mismatch between prescribed regimen and clinical response (e.g., uncontrolled HTN on 4 drugs)

— Children with failure to thrive, recurrent lead exposure, or asthma exacerbations

— Adults with frequent ED use for primary care issues

— Patients declining recommended diagnostics ("I can't afford that scan")

Social determinants of health (SDOH) are the non-medical conditions in which people are born, grow, work, live, and age that shape health outcomes — accounting for an estimated 40–50% of modifiable health outcomes, far exceeding clinical care (~10–20%).

Healthy People 2030 organizes SDOH into 5 domains:

When to suspect SDOH driving a presentation:

Step 3 management: Step 3 expects you to screen universally, not selectively. Implicit bias studies show clinicians under-detect SDOH when relying on appearance/demographics. Use a standardized tool (PRAPARE, AHC-HRSN, Hunger Vital Sign) at intake and annually.

Board pearl: SDOH screening is now a CMS quality measure (Z-codes Z55–Z65) and required for hospital accreditation by The Joint Commission since 2023. Documentation with Z-codes supports risk adjustment and reimbursement under value-based care.

High-yield framing: SDOH are upstream causes of the causes — addressing them shifts population-level outcomes more than any single drug.

Presentation Patterns and Key History

— "I had to choose between my insulin and rent" → cost-related non-adherence (affects ~25% of US adults with chronic disease)

— Skipping doses, splitting pills, sharing inhalers

— Job loss → loss of employer-sponsored insurance → gap in care

— Weight fluctuations, hypoglycemia at month's end (SNAP benefits exhausted), poorly controlled diabetes despite adherence

— Use the Hunger Vital Sign (2 questions): "Within the past 12 months, we worried whether our food would run out before we got money to buy more" and "the food we bought just didn't last" — either answered "often/sometimes true" = positive screen

— Couch-surfing, shelter use, eviction history, mold/pest exposure (asthma triggers)

— Ask: "Do you have a safe, stable place to sleep tonight?"

— Missed appointments clustered around bad weather, no car, distant clinic

— "I couldn't get a ride" — screen with single item: "In the past 12 months, has lack of transportation kept you from medical appointments, work, or getting things needed for daily living?"

SDOH rarely present as a chief complaint — they surface through patterns the astute clinician recognizes during routine encounters.

Economic instability red flags in history:

Food insecurity clues:

Housing instability:

Transportation barriers:

Intimate partner violence (IPV), discrimination, immigration status, literacy — ask privately, normalize ("I ask all my patients…")

Key distinction: Food insecurity ≠ hunger. Food insecurity is the uncertain access to nutritionally adequate food; many food-insecure patients are obese due to reliance on cheap, calorie-dense foods. Do not dismiss SDOH screening based on BMI.

Step 3 management: When a patient reveals an SDOH need, respond in the same visit — even if just acknowledgment + warm handoff to a social worker. Screening without response erodes trust and is considered low-value by AHRQ standards.

Board pearl: USPSTF recommends screening all women of reproductive age for IPV (Grade B) and connecting positive screens to support services.

Physical Exam Findings and Environmental Assessment

— Dental caries, gingivitis (cariogenic cheap diet, lack of dental access)

— Iron deficiency pallor, glossitis, angular cheilitis (B-vitamin deficiency)

— Pediatric stunting (height-for-age <5th percentile) vs wasting (weight-for-height) — chronic vs acute

— Paradoxical obesity with micronutrient deficiency

— Cockroach/dust mite exposure → eczema, allergic rhinitis, asthma

— Lead toxicity in children from pre-1978 housing → developmental delay, microcytic anemia, abdominal pain

— Cold-related: chilblains, frostbite in unhoused patients

— Bed bug bites in linear "breakfast-lunch-dinner" pattern

— Pneumoconioses (silicosis in miners/sandblasters, asbestosis in shipyard workers)

— Pesticide exposure in farmworkers (cholinergic toxidrome, neuropathy)

— Hearing loss in construction/factory workers

— Injuries in various stages of healing, central pattern (head/neck/torso) vs accidental (extremities), inconsistent history, partner answering for patient

— Track marks, nasal septal perforation, dental decay (methamphetamine "meth mouth")

— Hypertension disproportionate to known risk factors → chronic stress, neighborhood violence exposure (allostatic load)

— Tachycardia + weight loss in food-insecure adult → consider concurrent hyperthyroidism vs deprivation

Physical exam in SDOH-affected patients reveals downstream biological consequences of upstream social conditions — pattern recognition is key.

Signs suggesting food insecurity / nutritional gaps:

Signs of housing instability/poor housing quality:

Occupational exposure findings:

Signs of IPV:

Signs of substance use as coping for adverse social conditions:

Hemodynamic/vital sign clues:

Board pearl: Allostatic load — cumulative physiologic "wear and tear" from chronic stress — manifests as elevated cortisol, BP, HbA1c, CRP, and waist circumference. It mechanistically links discrimination/poverty to cardiometabolic disease.

Step 3 management: Document environmental exposures and consider home visit referral (visiting nurse, community health worker) for housebound or repeatedly noncompliant patients.

Diagnostic Workup — Screening Tools and Initial Assessment

— PRAPARE (Protocol for Responding to and Assessing Patient Assets, Risks, and Experiences) — 21 items, NACHC-developed, integrates with EHRs, covers all 5 domains

— AHC-HRSN (Accountable Health Communities Health-Related Social Needs) — CMS 10-item core screening for 5 high-priority needs: housing instability, food insecurity, transportation, utility help, interpersonal safety

— WE CARE — pediatric SDOH screener used in well-child visits

— Hunger Vital Sign (2 items, food insecurity) — sensitivity 97%, specificity 83%

— HITS (Hurt, Insult, Threaten, Scream) — IPV screening, 4 items

— Single-item health literacy: "How confident are you filling out medical forms by yourself?" — "somewhat/a little/not at all" = limited literacy

— REALM-SF (Rapid Estimate of Adult Literacy in Medicine, Short Form) — 7 words

— Pediatric lead level at 12 and 24 months (universal in Medicaid-eligible children; targeted in others based on housing-age and zip code risk)

— HbA1c, lipid panel with attention to access-related delays

— TB screening (IGRA preferred) in patients from high-prevalence countries, congregate housing, incarceration history

— HIV, HCV — opt-out universal screening per USPSTF/CDC regardless of risk disclosure (reduces stigma)

SDOH "diagnostics" are standardized screening instruments — Step 3 expects familiarity with tool names, domains, and implementation.

Comprehensive screening tools:

Domain-specific brief screens:

Initial "labs" to consider when SDOH suspected:

Step 3 management: When implementing screening, choose a validated tool, train staff, embed in workflow, and pre-arrange referral pathways before going live — screening without resources causes harm.

Board pearl: Sensitivity matters more than specificity for SDOH screens because false negatives miss vulnerable patients; false positives just trigger a (low-harm) social work referral. Choose high-sensitivity tools.

Key distinction: Screening identifies need; assessment quantifies severity and resources; intervention addresses it. Confusing these is a common Step 3 distractor.

Diagnostic Workup — Community-Level and Population Data

— Area Deprivation Index (ADI) — block-group ranking 1–100 across 17 socioeconomic indicators; higher = more deprived; predicts readmissions, mortality

— Social Vulnerability Index (SVI) — CDC tool, 4 themes (socioeconomic, household composition, minority/language, housing/transportation) — used for disaster preparedness and resource allocation

— Child Opportunity Index (COI) — neighborhood resources for child development

— BRFSS (Behavioral Risk Factor Surveillance System) — state-level health behaviors, CDC telephone survey

— NHANES — national, includes biomarkers + interviews

— YRBSS — Youth Risk Behavior Surveillance

— PRAMS — Pregnancy Risk Assessment Monitoring System

— Race/ethnicity-stratified outcomes (e.g., Black maternal mortality 3× white; Native American diabetes prevalence 2× white)

— Life expectancy gaps by ZIP code — can vary >20 years across census tracts within a single US city

— Cluster of pediatric asthma in one apartment complex → public health investigation, environmental assessment

— Outbreak of GI illness in low-income housing → water system investigation

— Cluster of elevated lead → housing department referral, source identification

Beyond individual screening, Step 3 expects fluency with population-level data sources that contextualize a patient's risk.

Area-level indices (geocoded to patient address/ZIP):

Surveillance systems:

Health disparities metrics:

Confirmatory "diagnostics" for SDOH-driven disease patterns:

Step 3 management: When you suspect a community-level health threat (cluster of disease, environmental exposure), report to local/state public health department — this is both ethical and legally required for notifiable conditions.

Board pearl: ICD-10 Z-codes (Z55–Z65) encode SDOH and should be documented at every relevant encounter — they enable risk adjustment, quality measurement, and population health reporting under MIPS/MACRA.

CCS pearl: On CCS-style cases, ordering "social work consult" early in an inpatient case with SDOH cues earns credit and prevents delayed discharge.

Risk Stratification and Intervention Logic

— Acute/safety-critical: active IPV, child/elder abuse, homelessness tonight, suicidal ideation, no food today → same-day intervention, social work, safe shelter, mandatory reporting if applicable

— Sub-acute: food insecurity, utility shut-off notice, eviction pending → same-week, connect to SNAP, LIHEAP, legal aid

— Chronic: low health literacy, low income, transportation barriers → longitudinal, integrate into care plan

— Ask (screen), Assess (severity, readiness), Advise (options), Assist (warm handoff/referral), Arrange (follow-up to verify resolution)

— Community health workers (CHWs) — reduce hospitalizations, improve chronic disease control (IMPaCT trial, Penn Medicine)

— Medical-legal partnerships — embed legal aid in clinic, address housing/disability/benefits

— Food prescription programs ("Food is Medicine") — produce vouchers, medically tailored meals; CMS demonstrating waivers

— Patient navigators — reduce no-show rates, improve cancer screening completion

— Housing First for chronically unhoused — provides housing without preconditions; reduces ED use, improves substance use treatment engagement

— High utilizers ("hot-spotting") → intensive case management

— Moderate risk → CHW outreach, telehealth

— Low risk → standard care + universal screening

Once SDOH needs are identified, stratify by acuity and modifiability to guide intervention intensity.

Acuity tiers:

Intervention framework — the "5 A's" adapted for SDOH:

Evidence-based interventions:

Risk-stratified care management:

Step 3 management: The correct answer often involves multidisciplinary coordination — social work, CHW, pharmacist for low-cost alternatives, behavioral health — rather than a single intervention.

Key distinction: Equity (giving people what they need to reach the same outcome) differs from equality (giving everyone the same). SDOH interventions are equity-based by design — more resources to higher-need patients.

Board pearl: Hot-spotting interventions show regression to the mean in RCTs (Camden Coalition trial) — be cautious interpreting before-after data without controls.

Pharmacotherapy — Prescribing Through an SDOH Lens

— Default to generics unless brand specifically required (narrow therapeutic index drugs: warfarin, levothyroxine, AEDs — even here, generic usually fine if consistent)

— Use $4 lists (Walmart, Costco, GoodRx) — most chronic disease staples (metformin, lisinopril, amlodipine, atorvastatin, HCTZ, sertraline, omeprazole) cost <$10/month

— Avoid combination products that cost more than separate generics; use combo pills when they reduce pill burden AND cost is comparable (improves adherence)

— Once-daily dosing > BID > TID > QID for adherence

— Check formulary tier before prescribing; non-formulary requires prior auth → delays care

— 340B drug pricing at FQHCs and DSH hospitals — substantial discounts

— Manufacturer patient assistance programs (PAPs) for insulin, biologics, oncology drugs

— Medicare Part D coverage gap ("donut hole") — reduced but still relevant; the Inflation Reduction Act caps out-of-pocket at $2,000/year (2025) and insulin at $35/month

— Type 2 DM in low-resource patient: metformin + glipizide + NPH/regular insulin if SGLT2i/GLP-1 unaffordable (counsel re: hypoglycemia)

— Asthma: generic ICS (budesonide, fluticasone) over brand combo inhalers when possible; SMART therapy (budesonide-formoterol) — formerly brand-only, now generic available

— Anticoagulation: warfarin remains correct answer when DOAC unaffordable AND reliable INR follow-up possible

Pharmacotherapy is where SDOH most directly intersects with daily prescribing — Step 3 frequently tests affordable, accessible regimen selection.

Cost-conscious prescribing principles:

Insurance/formulary navigation:

High-yield substitutions:

Step 3 management: Always ask about cost before/after prescribing: "Were you able to fill this and afford it?" Document non-adherence reasons specifically — "cost" vs "side effects" vs "forgot" drives different interventions.

Board pearl: Cost-related medication non-adherence increases all-cause mortality, hospitalization, and total healthcare spending — penny-wise/pound-foolish at the system level.

CCS pearl: On Step 3 cases, ordering "review medication costs with patient" or "pharmacy consult" is recognized as appropriate stewardship.

Non-Pharmacologic Interventions and Community Linkages

— SNAP (Supplemental Nutrition Assistance Program) — federal, income-based; clinicians can refer or provide eligibility info

— WIC (Women, Infants, Children) — pregnant/postpartum women + children <5; nutrition + formula + healthcare referrals

— School meal programs (free/reduced lunch, summer EBT)

— Food pantries, Meals on Wheels (homebound elderly), medically tailored meals for CHF/CKD/diabetes

— Produce prescription programs — reimbursable under some Medicaid 1115 waivers

— Section 8 housing vouchers, public housing, Housing First for chronic homelessness

— Continuum of Care programs for unhoused

— Medical respite beds for unhoused post-discharge

— Legal aid for eviction defense (medical-legal partnership)

— NEMT (Non-Emergency Medical Transportation) — Medicaid benefit, often underused

— Rideshare partnerships (Lyft/Uber Health), volunteer driver programs

— Telehealth as transportation workaround

— EITC (Earned Income Tax Credit) — largest US anti-poverty program; pediatricians can promote

— SSI/SSDI for disabled patients — clinicians complete disability paperwork

— Unemployment insurance, TANF

— Teach-back method — ask patient to explain plan in own words

— Plain language materials (6th-grade reading level), pictograms

— Reach Out and Read — pediatric literacy promotion in clinic

SDOH-focused care relies heavily on non-pharmacologic, community-based interventions — the "social prescription."

Food insecurity interventions:

Housing interventions:

Utility/heat: LIHEAP (Low Income Home Energy Assistance) — prevents shut-offs; clinicians can write "medical necessity" letters for patients on home O2, dialysis, refrigerated meds

Transportation:

Income/benefits:

Education/literacy:

Step 3 management: The correct intervention is often a referral, not a prescription. Maintain an updated community resource directory (e.g., findhelp.org / Aunt Bertha) and warm-handoff workflows.

Board pearl: Closed-loop referrals (confirming patient received the service) outperform "give them a phone number" referrals by 2–3× in resolution rates.

Special Populations — Elderly and Patients with Chronic Disease

— Social isolation/loneliness — mortality risk comparable to smoking 15 cigarettes/day (Holt-Lunstad meta-analysis); increases dementia, CVD, depression

— Food insecurity — 1 in 14 older adults; under-recognized because of stoicism, pride

— Elder mistreatment — physical, emotional, financial, neglect; mandatory reporting in most states (varies by state)

— Polypharmacy + cost — Medicare Part D donut hole, choosing between food and meds

— Transportation loss — driving cessation → isolation, missed appointments

— Housing — fixed income vs rising rents, falls in poorly maintained homes, lack of accessibility modifications

— Caregiver burden screen (Zarit Burden Interview)

— Functional status (ADLs, IADLs) — proxy for support needs

— Cognitive screen (Mini-Cog, MoCA) — affects capacity, vulnerability to exploitation

— Home safety assessment — falls risk, hoarding, utility status

— Dose adjustments often require labs that uninsured patients skip → check renal function before prescribing renally cleared drugs (metformin, DOACs, gabapentin)

— Dialysis patients face enormous transportation burden (3×/week); home modalities (PD, home HD) may improve QoL but require stable housing, electricity, sanitation

— PACE (Program of All-Inclusive Care for the Elderly) — capitated, integrated care for nursing-home-eligible elders living at home

— Older Americans Act programs — congregate meals, Meals on Wheels, senior centers

— Medicare Savings Programs, LIS (Low-Income Subsidy/"Extra Help") for Part D

Older adults experience SDOH through distinct mechanisms — fixed income, mobility decline, social isolation, ageism.

Key SDOH risks in elderly:

Assessment additions:

Renal/hepatic impairment + SDOH:

Resource programs:

Step 3 management: For elderly with new functional decline + missed appointments, consider home-based primary care referral and Area Agency on Aging linkage.

Board pearl: Social isolation in elderly patients is a prescribable problem — group medical visits, senior centers, faith communities, and intergenerational programs have evidence for reducing depression and mortality.

Key distinction: Self-neglect (capable adult refusing care) vs elder neglect (caregiver failing duty) — both reportable, different interventions.

Special Populations — Pregnancy, Pediatrics, and Marginalized Groups

— Maternal mortality: US has highest among high-income countries; Black women die at 3× rate of white women, persisting across income/education — implicating structural racism, implicit bias

— Prenatal care access — late entry to care correlates with poor outcomes; Medicaid covers ~42% of US births

— WIC, SNAP during pregnancy improve birth outcomes

— Doulas — emerging evidence for reducing C-section rates and improving experience, especially for Black patients; some states now cover via Medicaid

— IPV screening at first prenatal, each trimester, postpartum (ACOG)

— Postpartum Medicaid extension to 12 months (now in most states post-ARPA) — reduces maternal mortality

— ACEs (Adverse Childhood Experiences) — dose-response relationship with adult chronic disease (CVD, depression, addiction, early death); screen using ACE questionnaire

— Toxic stress disrupts neurodevelopment; buffering relationships protective

— Lead screening at 12 and 24 months (universal for Medicaid)

— Reach Out and Read, Bright Futures — anticipatory guidance with SDOH integration

— School-based health centers expand access

— LGBTQ+ patients — minority stress, healthcare avoidance, higher mental health/SUD burden; trauma-informed care, correct pronouns, PrEP access

— Immigrants/refugees — language barriers (use professional interpreters, not family, especially not children), fear of "public charge" deterring care (rule rescinded 2021 but chilling effect persists)

— Incarcerated/recently released — high mortality first 2 weeks post-release (overdose), gaps in chronic care; transitions clinics bridge

— Rural patients — provider shortages, transportation, hospital closures

SDOH effects are amplified and intergenerational in pregnancy and childhood — interventions here yield the largest population return.

Pregnancy:

Pediatrics:

Other marginalized groups:

Step 3 management: Always offer professional interpretation for LEP (Limited English Proficiency) patients — required under Title VI of Civil Rights Act and Section 1557 of ACA. Using family members is substandard care and a liability risk.

Board pearl: ACE score ≥4 quadruples risk of depression, doubles risk of CHD/cancer, and increases risk of suicide attempt 12-fold.

Complications and Adverse Outcomes of Unaddressed SDOH

— Ambulatory-care-sensitive condition admissions — preventable hospitalizations for asthma, CHF, diabetes, HTN — marker of primary care access failure

— 30-day readmissions — strongly predicted by post-discharge SDOH (food, transport, housing); not adjusted for in HRRP penalties → safety-net hospitals disproportionately penalized

— Medication non-adherence → uncontrolled chronic disease, end-organ damage

— Delayed cancer diagnosis — later-stage presentation in uninsured/underinsured → worse survival

— Mental health crises — untreated depression/anxiety → suicide, SUD, lost productivity

— Lead poisoning → developmental delay, behavioral issues, lower lifetime earnings

— Food insecurity → poor school performance, obesity, metabolic disease in adulthood

— ACEs → toxic stress → epigenetic changes, adult chronic disease

— Severe maternal morbidity (SMM), preterm birth, low birthweight, postpartum depression

— Pregnancy-associated deaths (homicide, suicide, overdose) — leading causes in US, often linked to IPV/SUD

— Life expectancy disparities — up to 20+ years across census tracts in same city

— Health inequities by race, income, geography — Black-white life expectancy gap ~5 years

— Excess mortality during disasters/pandemics concentrated in vulnerable communities (COVID-19, Hurricane Katrina)

— Economic costs — health inequities cost US ~$320 billion/year (Deloitte 2022)

— Prescribing unaffordable medications → silent non-adherence → uncontrolled disease blamed on patient

— Discharging unhoused patients without coordination → bounce-back admission, mortality

— Mandating dietary changes without addressing food access → patient shame, lost trust

Unaddressed SDOH produce predictable, measurable clinical and population-level harms Step 3 expects you to recognize.

Individual-level clinical complications:

Pediatric complications:

Maternal complications:

Population-level outcomes:

Iatrogenic harms from ignoring SDOH:

Step 3 management: Document "unable to obtain medication due to cost" rather than "non-compliant" — language matters legally and clinically; reframes problem from patient deficit to system failure.

Board pearl: Weathering hypothesis (Geronimus) explains accelerated biological aging in marginalized groups via cumulative SDOH exposure, manifesting as earlier onset CVD, DM, and reduced fertility.

When to Escalate — Acute Safety, Mandatory Reporting, and System-Level Response

— Active IPV with imminent danger → safety planning, hotline (1-800-799-SAFE), shelter referral, do not insist on leaving (most dangerous time)

— Suicidal ideation with plan/intent → ED, possible involuntary hold (state-dependent criteria)

— Child abuse/neglect suspected → mandatory report to CPS (all healthcare workers, all 50 states); reasonable suspicion threshold, not proof

— Elder/dependent adult abuse → APS report (mandatory in most states)

— Human trafficking → National Human Trafficking Hotline (1-888-373-7888); use trauma-informed approach; do not call law enforcement without patient consent unless minor or imminent danger

— No housing tonight + medical fragility (oxygen-dependent, dialysis, postpartum) → social work, medical respite, hospital admission if no alternative

— Food crisis (e.g., insulin-dependent diabetic with no food) → emergency food, glucose, social work

— Notifiable disease cluster → local/state health department

— Suspected environmental exposure (lead, carbon monoxide, contaminated water) → housing/health department investigation

— Outbreak in congregate setting (shelter, LTCF, jail) → public health notification + on-site mitigation

— "Social admission" is generally avoided but justified when discharge would cause harm (e.g., unhoused IDU with bacteremia needing IV abx, post-op patient with no caregiver, decompensated CHF in heat wave with no AC)

— Engage case management, social work, palliative care early — often on day 1

Most SDOH work is longitudinal, but certain situations require immediate escalation — Step 3 tests these triggers.

Same-day emergent escalation:

Public health escalation:

Inpatient triage logic:

CCS pearl: On Step 3 CCS cases involving social complexity, order "social work consultation" and "case management consult" on hospital day 1 — late ordering delays disposition and is penalized.

Step 3 management: Always document the report: agency contacted, person spoken to, time, content. Reporting is legally protected when in good faith (Good Samaritan-style immunity).

Board pearl: You do not need patient consent to make a mandatory report; in fact, you cannot withhold based on patient refusal. Inform the patient you are reporting unless doing so would endanger them.

Key Differentials — Distinguishing SDOH-Driven from Other Causes of Poor Control

— Cost-related non-adherence → cannot afford medication; intervention = generic substitution, PAP, $4 lists

— Access-related non-adherence → cannot get to pharmacy/clinic; intervention = mail-order, NEMT, telehealth

— Health literacy-related → doesn't understand regimen; intervention = teach-back, pictograms, simplified regimen

— Cultural/belief-related → distrust, alternative medicine preference, religious objection; intervention = motivational interviewing, cultural humility, partnership

— Side-effect related → tolerable alternative needed; not pure SDOH but interacts (cheaper drug with more SE may be only option)

— Cognitive impairment → forgets doses; intervention = pillbox, caregiver, simplified regimen, blister packs

— Mental health-related → depression, anxiety, SUD impair self-care; intervention = treat underlying condition

— Intentional non-adherence → patient priorities differ; intervention = shared decision-making

— Cost: "I stretch my pills," "skip when I can't afford refills" — often hidden unless asked directly

— Access: missed appointments cluster, lives far from pharmacy

— Literacy: cannot name medications, cannot describe purpose, asks others to read forms

— Cultural: prefers traditional remedies, distrustful of system based on history

— Direct, non-judgmental questions: "Many of my patients have trouble taking medications every day. What gets in the way for you?"

— Pharmacy refill history (objective adherence proxy)

— Pill counts, MEMS caps (research settings)

When a patient's disease is poorly controlled, distinguish SDOH-driven from other categories within the "non-adherence/treatment failure" differential.

Within the "non-adherence" differential — same category:

Distinguishing features in history:

Key distinction: Non-adherence ≠ non-compliance. "Non-adherence" is descriptive; "non-compliance" is judgmental and implies patient fault. Step 3 favors non-judgmental framing.

Diagnostic approach:

Step 3 management: Match intervention to root cause — prescribing the same drug with sterner counseling fails when the issue is cost or access.

Board pearl: Brown bag medication review (patient brings all bottles to visit) uncovers polypharmacy, duplications, OTCs, supplements, and adherence patterns no chart review captures.

Key Differentials — Other-Category Drivers of Population Health Outcomes

— Social/economic factors (~40%) — SDOH (income, education, employment, social support)

— Health behaviors (~30%) — smoking, diet, exercise, alcohol, sex (heavily shaped by SDOH)

— Clinical care (~20%) — access, quality

— Physical environment (~10%) — air/water quality, housing, neighborhood

— Genetics — variable, increasingly recognized as gene-environment interaction

— Genetic ancestry — sickle cell disease, BRCA mutations, G6PD — but race ≠ genetics; race is a social construct that proxies for SDOH exposure

— Implicit bias / structural racism in healthcare — documented under-treatment of pain in Black patients, delayed cardiac workup in women, dismissal of Native American patients

— Health system factors — provider shortages (HPSAs), hospital closures (especially rural and safety-net), insurance churn

— Policy factors — Medicaid expansion status (expansion states have better outcomes for low-income adults), minimum wage, paid sick leave

— Commercial determinants — tobacco, alcohol, ultra-processed food, firearms industries shape health behaviors and exposures

— Black patient with uncontrolled HTN: consider SDOH (access, cost, stress), biology (lower renin/salt sensitivity → different first-line preference: thiazide or CCB), and bias (under-treatment) — usually multifactorial

— Native American patient with diabetes: consider SDOH (food deserts on reservations, Indian Health Service underfunding), historical trauma, genetic susceptibility — address all

— Disparity — any difference in health outcomes between groups (descriptive)

— Inequity — unjust, avoidable disparity (normative)

— Equity — fair opportunity for all to attain full health potential (goal)

Differentiate SDOH effects from other major drivers of population health outcomes — Step 3 expects framework fluency.

The "determinants of health" framework (proportional contribution):

Distinguishing other-category causes of disparate outcomes:

Disentangling in clinical scenarios:

Health equity vs health disparity vs health inequity:

Step 3 management: Avoid attributing disparities solely to "genetics" or "lifestyle choices" — this is scientifically inaccurate and perpetuates inequity. The correct framing integrates SDOH, structural factors, and biology.

Board pearl: Race-based clinical algorithms (eGFR, VBAC, pulmonary function) are being revised because race-correction often perpetuates inequity; eGFR equations now race-free (CKD-EPI 2021).

Long-Term Plan — Integrating SDOH into Chronic Disease Management

— Annual (minimum) SDOH re-screen — needs change with life circumstances

— Updated problem list with Z-codes — supports care coordination, risk adjustment

— Named care team: PCP, CHW/navigator, social worker, pharmacist, behavioral health

— Closed-loop referral tracking — confirm services received, not just offered

— Medication reconciliation with cost check at each visit

— Patient-defined goals — what matters to patient (e.g., "make it to my granddaughter's graduation") drives motivation more than HbA1c targets

— Post-MI patient with food insecurity: cardiac rehab + nutrition referral + medically tailored meals (where available) + generic statin/BB/ACEi

— Post-stroke patient with no caregiver: home health + medical alert system + caregiver respite + transportation for rehab

— Post-discharge patient with housing instability: medical respite bed, shelter coordination, follow-up in 7 days (in-person or telehealth)

— Risk-stratified panel management — identify high-risk patients for proactive outreach

— Registry-based recall for overdue screenings, vaccinations, chronic disease metrics

— Group medical visits for diabetes, prenatal care — peer support + efficient education

— Community partnerships — faith-based organizations, schools, food banks, housing authorities

— PCMH (Patient-Centered Medical Home) model integrates SDOH

— ACOs with shared savings incentivize SDOH investment

— Medicaid 1115 waivers for "health-related social needs" — food, housing, transportation as covered benefits in some states (e.g., NC, CA CalAIM, OR)

Sustainable SDOH-informed care requires systematic integration into chronic disease management plans, not one-time fixes.

Care plan components for SDOH-affected patients:

Secondary prevention through SDOH lens:

Quality improvement and population health:

Health system supports:

Step 3 management: At every chronic disease visit, the discharge plan should answer: "What barriers might prevent this plan from working, and what's our backup?"

Board pearl: Continuity of care with the same PCP independently improves outcomes (reduced mortality, hospitalizations) — staffing models and insurance churn that disrupt continuity worsen SDOH-affected patients most.

Follow-Up, Monitoring, and Counseling Cadence

— High-risk (recent hospitalization, multiple SDOH needs, complex disease): 7-day post-discharge visit (in-person or telehealth), then biweekly until stable, then monthly

— Moderate-risk: monthly to bimonthly with CHW touchpoints between

— Low-risk with controlled chronic disease: every 3–6 months standard

— Medication adherence: pharmacy fill history, self-report, pill counts, MPR (medication possession ratio)

— Appointment adherence: no-show rate; pattern analysis identifies access barriers

— Re-screening: annual SDOH re-screen + after life events (job loss, eviction, new diagnosis, pregnancy)

— Clinical metrics: standard (HbA1c, BP, lipids) but interpret in context of access

— Patient-reported outcomes: PHQ-9, GAD-7, quality of life

— Motivational interviewing — patient-centered, especially for behavior change in resource-limited settings

— Health coaching by CHWs — peer-level, culturally concordant

— Group visits — peer support, efficient

— Telehealth — overcomes transportation, but digital divide (broadband, devices, literacy) creates new equity issue

— Asynchronous messaging — patient portals; barrier for low-literacy/LEP patients

— Cardiac/pulmonary rehab dramatically underutilized in low-income, minority, female, and rural patients; automatic referral + addressing transport improves uptake

— Home-based rehab when facility-based not accessible

— Use every encounter to update; standing orders, reminder systems

— Address vaccine hesitancy with cultural humility, trusted messengers

Follow-up intensity for SDOH-affected patients should be tailored to risk and resources, not standardized to "see in 3 months."

Recommended cadence by risk tier:

Monitoring parameters specific to SDOH:

Counseling modalities:

Rehab considerations:

Vaccination/screening catch-up:

Step 3 management: Pre-visit planning — review chart, gaps in care, SDOH needs, refills due — converts a problem-focused visit into a comprehensive one without adding visit time.

CCS pearl: Schedule 7-day post-hospital follow-up for high-risk patients — strongly reduces 30-day readmission and is a quality metric.

Board pearl: Telehealth parity policies (post-COVID) expanded access but audio-only visits (for patients without smartphones/broadband) must be allowed to avoid widening disparities.

Ethical, Legal, and Patient Safety Considerations

— LEP patients: consent obtained through professional interpreter is required for valid consent; family member interpretation is substandard and exposes liability, especially for procedures

— Low health literacy: use teach-back; document patient's understanding in their own words

— Patients with cognitive impairment: assess decision-making capacity for the specific decision; involve surrogates per state hierarchy if lacking

— Adolescents: minor consent laws vary by state for contraception, STI testing, mental health, SUD treatment — generally permitted without parental consent

— Screening information is PHI — protect; share only with patient consent or treatment necessity

— IPV documentation — be cautious; abuser may access records via shared insurance or patient portal; use coded notes when needed

— Immigration status — generally do not document unless clinically necessary; protect from disclosure

— Child abuse/neglect — all states, reasonable suspicion

— Elder abuse / dependent adult abuse — most states

— Notifiable diseases — per state list (TB, STIs, foodborne, vaccine-preventable, COVID, etc.)

— Gunshot/stab wounds — most states

— Impaired drivers — varies by state (mandatory in some for seizures, dementia)

— Discharge to inadequate housing/support = predictable harm; document SDOH assessment and mitigation

— Medication reconciliation at every transition (admission, transfer, discharge) — Joint Commission NPSG; errors disproportionately harm low-literacy patients

— Discharge summaries to PCP within 48 hours; warm handoff superior

— Clinical algorithms trained on biased data perpetuate disparities (e.g., Optum algorithm under-referred Black patients to high-risk care because it used cost as proxy for need)

— Audit algorithms for disparate impact

— EMTALA — ED must screen and stabilize regardless of ability to pay

— Title VI / Section 1557 — language access, anti-discrimination

— ADA — disability accommodations

— HIPAA — privacy protections; permits disclosures for public health, mandatory reporting, abuse reporting

SDOH work sits at the intersection of clinical ethics, law, and patient safety — Step 3 examines this explicitly.

Informed consent edge cases:

Confidentiality and SDOH screening:

Mandatory reporting (clinician duty):

Transition-of-care safety:

Equity in research and AI:

Legal protections:

Step 3 management: When a patient declines a recommended intervention citing cost, explore alternatives (generic, PAP, sliding-scale clinic) rather than documenting "patient refused" — the latter is misleading and may have legal implications.

Board pearl: Just culture in patient safety holds systems, not individuals, accountable for predictable errors — applies to SDOH gaps where systemic fixes (e.g., universal screening, CHW integration) outperform exhorting clinicians to "do more."

High-Yield Associations and Rapid-Fire Facts

SDOH proportion of health outcomes: ~40–50% (vs ~20% clinical care, ~30% behaviors, ~10% environment)

Healthy People 2030 domains (5): Economic Stability, Education, Healthcare Access, Neighborhood/Built Environment, Social/Community Context

ICD-10 Z-codes for SDOH: Z55–Z65

PRAPARE — comprehensive SDOH tool (NACHC); AHC-HRSN — CMS 10-item core

Hunger Vital Sign — 2 items; sens 97%

Food insecurity ≠ hunger; often coexists with obesity

Black maternal mortality = 3× white; persists across education/income

ACE score ≥4 quadruples depression risk, 12× suicide attempt risk

Social isolation mortality ≈ smoking 15 cigarettes/day

Life expectancy can differ >20 years across ZIP codes in same city

Lead screening — universal at 12 and 24 months for Medicaid-eligible

WIC — pregnant/postpartum + children <5

SNAP — federal food assistance; income-based

LIHEAP — utility assistance; medical necessity letters help

NEMT — Medicaid non-emergency medical transportation benefit

EITC — largest US anti-poverty program

Housing First — provides housing without preconditions; reduces ED use

Medical-legal partnerships — embed legal aid in clinic

CHWs (community health workers) — reduce hospitalizations (IMPaCT trial)

Closed-loop referrals outperform "phone number" referrals 2–3×

Title VI / Section 1557 require language access; use professional interpreters, never children

EMTALA — ED screening/stabilization regardless of payment

Allostatic load — biological "wear" from chronic stress

Weathering hypothesis — accelerated aging from cumulative SDOH exposure

Race-corrected eGFR removed (CKD-EPI 2021) to address inequity

PACE — integrated care for nursing-home-eligible elders at home

Postpartum Medicaid extended to 12 months in most states

Medicare Inflation Reduction Act — insulin $35/month; OOP cap $2,000 (2025)

Cost-related non-adherence ↑ mortality and hospitalization

5 A's: Ask, Assess, Advise, Assist, Arrange

Equity ≠ Equality — equity means resources matched to need

Just culture addresses systems, not individuals

Key distinction: "Disparity" describes, "inequity" judges, "equity" aspires.

Board pearl: Universal screening with closed-loop referral and same-visit response is the gold-standard SDOH workflow.

Board Question Stem Patterns

"A 58-year-old man with HTN returns with BP 168/96 despite being prescribed lisinopril, amlodipine, HCTZ, and metformin. He recently lost his job and insurance. Next best step?" → Switch to $4 generics, simplify regimen, address cost; refer to FQHC / pharmacy assistance — not add a 4th antihypertensive.

"A 45-year-old woman has end-of-month hypoglycemia despite stable insulin dose; HbA1c 9.2%. Which screening tool?" → Hunger Vital Sign; intervene with SNAP/WIC, food pantry, medically tailored meals, adjust insulin to food access.

"An 18-month-old Medicaid-enrolled child in a pre-1978 home. Best screening?" → Blood lead level; if elevated, report to health department, environmental investigation, follow-up testing, nutritional counseling (iron, calcium, vitamin C).

"A 32-year-old woman with frequent ED visits for vague pain, partner answers questions for her. Next step?" → Interview alone with professional interpreter if needed; use HITS; offer hotline, safety plan; do not force disclosure or leaving.

"Spanish-speaking patient needs surgical consent; her teenage son is available to interpret." → Use professional medical interpreter (in-person, phone, or video); do not use family, especially minors.

"Unhoused man with cellulitis on IV antibiotics ready for discharge." → Medical respite bed referral, OPAT coordination, social work, 7-day follow-up.

"Suspected child neglect — parent insists you not report." → Report anyway; mandatory reporter, reasonable suspicion threshold, good-faith immunity.

"Black woman with chest pain receives less aggressive workup than her white roommate." → Recognize implicit bias / structural racism; apply guideline-directed evaluation equally; bias training, standardized protocols.

"Hospital readmission rates penalize safety-net hospitals." → Because HRRP does not fully risk-adjust for SDOH; addressed by stratified comparison groups.

"Clinic switches entirely to video visits; no-show rate rises in elderly Medicare population." → Offer audio-only option, in-person access, community technology assistance.

Pattern 1 — Cost-related non-adherence disguised as treatment failure:

Pattern 2 — Food insecurity in a diabetic:

Pattern 3 — Pediatric lead exposure:

Pattern 4 — IPV detection:

Pattern 5 — Language access:

Pattern 6 — Post-discharge SDOH:

Pattern 7 — Mandatory reporting:

Pattern 8 — Health disparity recognition:

Pattern 9 — Population health metric:

Pattern 10 — Telehealth and digital divide:

Step 3 management: When stems mention insurance change, job loss, eviction, language, immigration, recent release from incarceration, or geographic relocation, the answer almost always involves addressing the SDOH before escalating pharmacotherapy.

Board pearl: The "best next step" with SDOH stems is rarely a new drug or test — it's typically a referral, screening tool, or system-level intervention.

One-Line Recap

Social determinants of health drive ~40–50% of health outcomes, and the Step 3 physician's job is to universally screen for them with validated tools, respond in-visit with closed-loop referrals to evidence-based resources, and integrate SDOH into every clinical decision — from medication selection to discharge planning to long-term chronic disease management — recognizing that addressing upstream social conditions produces greater health gains than any single clinical intervention.

Screen universally, not selectively — use PRAPARE, AHC-HRSN, Hunger Vital Sign, HITS; document with ICD-10 Z-codes (Z55–Z65); re-screen annually and after life events.

Respond, don't just document — same-visit acknowledgment, warm handoff to social work/CHW, closed-loop referral to SNAP, WIC, LIHEAP, NEMT, Housing First, medical-legal partnership, professional interpreters; screening without response erodes trust and is low-value.

Prescribe with affordability in mind — generics, $4 lists, PAPs, simplify regimens, ask about cost at every visit; document "cost barrier" rather than "non-compliant."

Escalate when safety demands — mandatory reporting for child/elder abuse and notifiable diseases; same-day intervention for IPV, suicidality, homelessness with medical fragility, food crisis in insulin-dependent patients; engage social work and case management on hospital day 1.

Recognize structural drivers — implicit bias, structural racism, language access laws (Title VI, Section 1557), EMTALA, weathering, allostatic load, ACEs, and intergenerational transmission — and reframe disparities as inequities requiring system-level solutions, not patient-level deficits.

Board pearl: The right answer on SDOH stems is almost never a new prescription — it's a screen, a referral, a system fix, or an interpreter.