The chief medical officer at a large Coordinated Care Organization in Oregon examines actuarial projections showing federal work requirements effective December 2026 will affect approximately 520,000 expansion adults across Oregon’s CCO network. Her organization serves roughly 185,000 of them, not marginal members generating minimal revenue but precisely the members her CCO has invested most heavily in over the past five years: patients with diabetes who finally achieved A1C control after eighteen months of care management, individuals with serious mental illness whose medication adherence required weekly care coordinator contact, members recovering from substance use disorder who are six months into successful treatment. The spreadsheet contains conventional projections showing expected coverage losses of 15 to 20 percent, premium revenue reduction of $84 million annually, global budget adjustment implications. The numbers look concerning but manageable.
What the spreadsheet fails to capture is everything that happens after a member loses coverage. Maria, 47, works seasonally in agricultural processing with type 2 diabetes, hypertension, and depression. The CCO’s disease management program spent eighteen months achieving her current stability. When Maria loses coverage in March because her winter work hours fell below 80 monthly, the investment evaporates. When she returns in September after demonstrating spring and summer employment, her conditions have deteriorated during six months without medication access. The CCO must restart from a worse baseline while bearing immediate costs that exceed Maria’s inadequate returning risk score.
Value-based care economics require enrollment stability that work requirements destroy. The three-year investment horizon that justified prevention spending, behavioral health integration, and community health worker programs assumed members would remain attributed long enough for returns to materialize. Semi-annual redetermination cycles compress that horizon below the threshold where most upstream investments break even.
Most early analyses of ACO financial exposure from work requirements follow straightforward methodology identifying expansion adult attribution, estimating percentage losing coverage due to compliance failures, and multiplying by average per-member revenue. This logic fails for ACOs in ways it does not fail for fee-for-service arrangements or even traditional managed care. ACO payment models reward investment in prevention, care coordination, and population health improvement. These investments require upfront spending that generates returns over time. When the invested population disappears mid-cycle, the ACO has incurred costs without opportunity for return. The economics differ fundamentally from arrangements where payments and costs flow in parallel.
Consider what actually happens when an ACO invests in a complex member who subsequently loses coverage. Roberto, 52, has poorly controlled diabetes, hypertension, chronic kidney disease, and depression. His baseline risk profile projects healthcare costs of approximately $48,000 annually. The ACO assigns a nurse care manager, connects Roberto with a community health worker for food access support, schedules monthly primary care visits, and coordinates behavioral health integration for his depression. Six months into the performance year, Roberto’s care is improving. His A1C has dropped from 9.2 to 7.8, blood pressure is approaching target, depression responding to medication and therapy. The ACO has invested approximately $6,000 in care coordination, care management, and community health worker support during these six months.
Roberto works as a delivery driver for a restaurant supply company with fluctuating hours. During slow winter months, he sometimes drops to 60 hours. In January, his hours fall below the 80-hour monthly threshold. His employer provides limited documentation because driver hours vary by route assignment and tips constitute meaningful income. Roberto fails work requirement verification in March. His care costs during his enrolled months totaled approximately $24,000 for medical services plus the $6,000 coordination investment. The ACO bore these costs. Roberto disappears from attribution with six months of costs absorbed and no opportunity to capture the returns that would have materialized in subsequent quarters and years. The stranded investment represents direct financial loss.
Roberto may return. After demonstrating adequate work hours during spring and summer, he re-enrolls in September. During his six-month coverage gap, Roberto could not afford his medications. His diabetes control deteriorated rapidly with A1C rising to 10.4. His blood pressure elevation caused symptoms that sent him to an emergency department for an uninsured visit he cannot pay for. His depression worsened as his health destabilized. Roberto’s returning risk profile does not reflect his actual acuity. ACO risk adjustment models use twelve to twenty-four month lookback periods for diagnosis capture and severity scoring. Half of Roberto’s lookback now consists of months without coverage and without documented care. His returning risk score suggests a moderately complex diabetic member. His actual presentation is a severely decompensated patient requiring intensive intervention.
The ACO faces risk adjustment degradation, systematic underpayment for members whose returning risk scores inadequately capture their current clinical needs. Roberto’s risk score generates approximately $400 monthly in risk-adjusted payment. His actual care costs during restabilization will exceed $1,000 monthly. The ACO absorbs a $600 monthly shortfall that flows directly to the bottom line without any revenue offset. This mismatch persists until new documentation accumulates to recapture lost diagnosis codes and severity indicators. If Roberto sees his primary care physician quarterly, it takes twelve months of consistent care to generate four encounters documenting his chronic conditions at their current severity. During those twelve months, the ACO absorbs systematic underpayment that accumulates to approximately $7,200 per complex returning member.
True financial impact from work requirements involves at least seven distinct components for ACOs, with relative weight varying substantially based on payment model structure. Component 1: Direct Revenue Loss varies by payment model. Under global budgets, lost revenue has no associated cost offset because infrastructure costs remain fixed. Under shared savings, lost members represent investment without return opportunity. Under two-sided risk, permanent departures may reduce downside exposure for high-cost members while eliminating upside potential for improving members. Component 2: Stranded Investment represents care management programs, behavioral health integration, community health worker support, and chronic disease intervention representing sunk costs that evaporate when members lose coverage. Component 3: Risk Adjustment Degradation shows members returning after coverage gaps presenting with degraded risk scores that inadequately capture their actual acuity. Conservative estimates suggest complex members returning after coverage gaps generate underpayment of $5,000 to $8,000 per member during twelve-month recapture periods. This component represents the largest source of exposure for ACOs with significant returning member populations.
Component 4: Quality Measure Disruption affects ACO payment models that tie substantial revenue to quality performance. Coverage churn creates measurement problems where members who lose coverage mid-measurement period may be excluded from denominators entirely, potentially helping quality rates, but the prevention investments targeting those members represent stranded costs. Members who return with deteriorated conditions worsen quality metrics for the subsequent measurement period. Component 5: Global Budget Structural Mismatch applies to global budget models where infrastructure costs for care coordination, behavioral health integration, and community health improvement remain fixed regardless of enrollment fluctuation. When enrollment declines, per-member infrastructure costs rise as fixed costs spread across fewer members. Component 6: Shared Savings Calculation Distortion shows ACOs receiving shared savings payments face complex year-end calculations comparing actual costs to benchmarks. Members who lose coverage mid-year after consuming significant healthcare resources count toward costs but not toward denominator calculations that determine benchmark adequacy. Component 7: Two-Sided Risk Asymmetry means ACOs bearing downside risk face asymmetric exposure where high-cost members who lose coverage early in the performance year leave the ACO holding their costs without opportunity to manage subsequent utilization.
Oregon’s sixteen Coordinated Care Organizations face the most concentrated financial exposure among ACO models. CCOs receive fixed monthly per-member payments covering physical, behavioral, and oral health services, bearing full financial risk for attributed populations. Infrastructure costs remain fixed regardless of enrollment fluctuation. With 520,000 expansion adults statewide, conventional analysis estimates global budget revenue from expansion adults at $3.12 billion with revenue reduction from 20 percent coverage loss of $624 million. Infrastructure cost reallocation means CCO fixed costs remain constant while spreading across 20 percent fewer members. Conventional estimate of financial strain comes to $94 to $125 million for infrastructure mismatch plus cash flow disruption. Comprehensive seven-component analysis reveals direct revenue loss of $62 million, stranded investment of $52 million, risk adjustment degradation of $286 million from 41,000 complex returners at $7,000 each, quality measure disruption of $31 million, and global budget structural mismatch of $47 million for total Year 1 impact of $478 million and stabilized annual impact of $312 million.
Across all states operating Medicaid ACO or ACO-like programs, approximately 2.4 million expansion adults face work requirements under value-based payment arrangements. Nationwide ACO sector exposure shows global budget models covering 575,000 expansion adults face Year 1 exposure of $510 million stabilizing at $335 million annually. Two-sided risk models covering 435,000 expansion adults face Year 1 exposure of $340 million stabilizing at $225 million. Shared savings models covering 195,000 expansion adults face Year 1 exposure of $176 million stabilizing at $115 million. RAEs and hybrid models covering 680,000 expansion adults face Year 1 exposure of $545 million stabilizing at $355 million. California ACO and ACO-like arrangements covering 380,000 expansion adults face Year 1 exposure of $305 million stabilizing at $200 million. The aggregate Year 1 exposure of approximately $2 billion represents a fundamental challenge to the Medicaid ACO sector with stabilized annual exposure of $1.3 billion persisting indefinitely as long as work requirements generate enrollment churn among complex populations.
The insight that matters most: ACOs face greatest financial impact not from members who leave permanently but from members who cycle through coverage gaps and return with inadequate risk scores. This reframes intervention strategy. Navigation investment should concentrate on preventing coverage disruption among complex members whose risk adjustment profiles create greatest exposure rather than spreading thin across all expansion adults.