The One Big Beautiful Bill

Signed on July 4, 2025, the One Big Beautiful Bill Act is the largest federal budget reconciliation law since the Affordable Care Act. Its health provisions are centered on Medicaid, where the savings are massive and the structural changes are permanent. But the law’s effects do not stop at the Medicaid boundary. The downstream pressure on dual eligible populations, state fiscal capacity, and the long-term Medicare financing environment makes OBBBA as much a Medicare story as a Medicaid one. This article maps the law’s health provisions and traces the cascade.

The Work Requirement Architecture

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The core of OBBBA’s Medicaid savings mechanism is a federal work requirement applied, for the first time on a national scale, to adults enrolled through the ACA Medicaid expansion. Adults aged 19 through 64 who receive coverage through expansion or a qualifying 1115 demonstration waiver must complete 80 hours per month of qualifying community engagement activities including employment, job training, education at least half-time, community service, or some combination of these. Exemptions cover individuals aged 65 or older, those with a documented disability or medical frailty determination, pregnant women, and adults with caretaker responsibilities for dependents.

States are required to verify compliance at application and at least every six months following enrollment. They may impose more frequent verification cycles if they choose. The federal implementation deadline is January 1, 2027, though states that demonstrate a good faith effort may receive extensions to December 31, 2028. HHS was required to issue guidance by June 2026, and CMS issued preliminary guidance in December 2025.

The CBO’s projections on the work requirement provisions account for the single largest share of OBBBA’s Medicaid savings, estimated at $326 billion in reduced federal spending over the ten-year budget window. CBO projects that 4.8 million adults will lose coverage by 2034 as a direct result. A critical feature of the law compounds this figure: individuals who lose Medicaid coverage due to work requirement noncompliance are expressly ineligible for ACA Marketplace premium tax credits. They do not qualify for employer-sponsored coverage at meaningful rates, and they have no federal subsidy pathway available. The coverage gap created by this provision is structurally different from prior Medicaid gaps because it is legislatively sealed.

The administrative machinery required to implement work requirements at scale is itself a major risk factor. Arkansas’s 2018 attempt resulted in 18,000 people losing coverage before a federal court halted the program, and administrative error, not intentional noncompliance, accounted for the majority of disenrollments. Six-month verification cycles applied to over 20 million expansion enrollees across 41 states represent a processing volume with no federal precedent. State eligibility systems built for annual redetermination cycles will need retooling, and the December 2025 CMS guidance does not resolve the implementation complexity.

The aged and disabled Medicaid population is formally exempt from the 80-hour requirement. But exemption from the work mandate does not mean exemption from the administrative apparatus surrounding it. Documentation requirements, medical frailty determinations, and six-month verification cycles all apply to the broader eligibility environment. Individuals who are near the disability determination threshold face renewed scrutiny at renewal. For the dual eligible population, which includes low-income beneficiaries enrolled in both Medicare and Medicaid, the administrative churn created by intensified Medicaid eligibility verification is a structural risk even when no individual is directly subject to the work requirement itself.

Provider Taxes and State-Directed Payments

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OBBBA makes two interconnected changes to Medicaid financing that will reshape how states fund their programs and pay their providers.

The first is a graduated reduction in the provider tax safe harbor. States have long used provider taxes as a financing mechanism, taxing hospitals and other providers and then using the collected revenue to draw down federal matching funds at the applicable FMAP rate. The safe harbor that protected taxes up to 6% of net patient revenues is phased down to 3.5% by 2032. The reduction begins in 2028 and proceeds in annual increments. States with provider taxes near or at the 6% ceiling, which represented 32 states as of 2019, face a phased loss of the financing leverage these taxes provide. CBO estimates the provision reduces federal outlays by $89 billion. RAND’s analysis of the full OBBBA package estimates total Medicaid funding flowing through state programs declines by $664 billion between 2025 and 2034, a figure that subsumes provider tax effects alongside work requirement savings and other provisions.

The second change is a cap on state-directed payments. States use state-directed payments, channeled through managed care contracts, to pay Medicaid providers at rates above what the base capitation rate would support. OBBBA limits these supplemental payments to 100% of Medicare rates in expansion states and 110% of Medicare rates in non-expansion states. Programs that exceed these ceilings must phase down by 10 percentage points annually beginning January 1, 2028. Safety-net hospitals, disproportionate share facilities, and nursing homes that rely on state-directed payments to offset Medicaid underpayments will see a phased reduction in supplemental support coinciding with the projected drop in insured patients from the work requirement provisions. The timing compounds the stress.

The FMAP reduction for states covering undocumented immigrants adds a third fiscal pressure. States that provide full-scope Medicaid to undocumented immigrants using state funds, a choice several states have made, see their federal matching rate reduced. The interaction with states that are simultaneously managing the provider tax phase-down and state-directed payment cap creates a fiscal environment where the tools states have historically used to absorb Medicaid cuts are all being constrained at the same time.

The Rural Health Transformation Program

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One major offset to the Medicaid cuts is the Rural Health Transformation Program. OBBBA appropriates $10 billion per fiscal year for fiscal years 2026 through 2030, $50 billion over five years, disbursed through CMS as grants to eligible states. States must submit an application to CMS by December 31, 2025, including a detailed rural health transformation plan and a certification of expenditure. CMS must approve or deny applications by an early 2026 deadline.

RHTP targets rural hospital stabilization, workforce support, broadband expansion, and ambulance services. The program was created in recognition that OBBBA’s Medicaid cuts fall disproportionately on rural states and rural hospitals, many of which operate with thin Medicaid margins and no alternative revenue source. Rural hospitals in states that did not expand Medicaid are in a particularly precarious position: they lose coverage among their low-income patients through OBBBA’s eligibility tightening without having the expansion population base that expansion states can partially protect.

Whether RHTP funding reaches the providers and communities it is designed to support depends on implementation choices that remain unresolved. Grant mechanisms, distribution formulas, eligible expenditure categories, and application requirements will all be defined through CMS guidance. The program’s effectiveness is also partly contingent on whether rural states can navigate the application process within the compressed timeline. States that have not historically administered large federal grant programs may lack the administrative infrastructure to develop compliant applications quickly.

The RHTP’s interaction with Critical Access Hospital economics is direct. CAHs receive cost-based Medicare reimbursement, which creates a floor below which Medicare payment cannot fall. But CAHs’ financial viability depends on Medicaid, which is subject to the full scope of OBBBA’s cuts. Whether RHTP grant funding is sufficient to offset the Medicaid revenue decline at individual facilities will vary enormously by state and facility. The program is a significant investment and a meaningful acknowledgment that the legislation creates concentrated rural risk. Whether it is sufficient is a different question.

Medicare Provisions

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Medicare received considerably lighter treatment in OBBBA than Medicaid. The major Medicare provision is a temporary 2.5% conversion factor update for 2026, providing one year of payment relief for physicians without addressing the structural inadequacy of the physician fee schedule’s update mechanism. The Senate-passed version replaced an earlier House provision that would have applied a 75% Medical Economic Index inflation update for 2026 followed by annual 10% MEI increases, leaving no permanent inflation-adjusted fix in the final law.

Several Medicare provisions that circulated during the legislative process did not survive reconciliation. Premium support restructuring, means-testing modifications, and benefit changes were all discussed and all dropped. The parliamentary constraints of the budget reconciliation process under the Byrd Rule constrained what could be included, as did the political arithmetic of a 218-214 House vote and a 51-50 Senate vote.

The most consequential indirect Medicare effect in OBBBA involves the Social Security benefit tax elimination. OBBBA eliminates the income tax on Social Security benefits for certain beneficiaries, a provision with meaningful implications for Hospital Insurance Trust Fund financing. Social Security benefit tax revenues are partially directed to the HI Trust Fund. Eliminating or reducing them accelerates the depletion trajectory for a trust fund already projected to face insolvency by the early 2030s. The conversion factor update is temporary. The trust fund acceleration is structural.

The prohibition on CMS enforcement of the Medicare Savings Program enrollment rule until October 2034 is a smaller but specific Medicare provision worth noting. The MSP rule that was stayed made it easier for dual eligible beneficiaries to enroll in programs that pay Medicare premiums and cost-sharing. Suspending enforcement means that some low-income Medicare beneficiaries who would have benefited from streamlined MSP enrollment will not receive it. For a population with limited financial margins, MSP enrollment is often the difference between manageable and catastrophic cost-sharing exposure.

The Medicaid-to-Medicare Cascade

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The most significant Medicare dimension of OBBBA is not any direct Medicare provision. It is the downstream effect of large-scale Medicaid disruption on populations that eventually age into or are simultaneously enrolled in Medicare.

Individuals who lose Medicaid coverage during the years between Medicaid eligibility and Medicare eligibility at 65 enter a coverage gap with no federal subsidy pathway. The OBBBA marketplace ineligibility provision closes the ACA route. Those who lose Medicaid in their early 60s, a period of high healthcare utilization, may remain uninsured until Medicare eligibility. Delayed care during this window worsens health status at Medicare entry, increasing the costs and complexity of care that Medicare must manage from enrollment forward.

For current dual eligibles, the risk is different but equally structural. Aged and disabled individuals formally exempt from work requirements are not insulated from the administrative consequences of the broader Medicaid eligibility environment. States managing higher verification volumes, tighter provider tax funding, capped state-directed payments, and reduced FMAP will have less administrative capacity and fewer financial resources for D-SNP integration, FIDE SNP build-out, and PACE expansion. The infrastructure required to serve dual eligibles well is resource-intensive. OBBBA compresses the resources states have available precisely when the dual eligible population is growing.

The interaction with LTSS coverage is particularly acute. When individuals who relied on Medicaid long-term services and supports lose Medicaid coverage, Medicare does not provide a replacement. Medicare covers skilled nursing facility care on a time-limited, post-acute basis. It does not cover custodial care, home health below the skilled care threshold, or the full range of community-based LTSS that Medicaid funds. The OBBBA-driven contraction of Medicaid LTSS availability is therefore not a benefit that Medicare absorbs. It becomes an unmet need.

State fiscal pressure from OBBBA will also affect D-SNP policy choices. States that face Medicaid budget shortfalls have less capacity to negotiate D-SNP integrated care coordination agreements, to fund state-directed payment supplements for integrated plans, or to mandate FIDE SNP enrollment as an alternative to broader Medicaid managed care contracting. The integration policy environment that CMS has been building through D-SNP alignment rules and FIDE SNP requirements depends on state partnership that states under severe fiscal stress may not be able to sustain.

The work requirement verification apparatus itself carries a secondary effect that warrants attention. States that build the administrative infrastructure to conduct six-month verification cycles for 20-plus million expansion adults will have a functional eligibility churn engine that can be applied to other eligibility processes. The pattern of administrative disenrollment observed in Arkansas, where the majority of coverage losses came from verification failures rather than actual noncompliance, is not an exception. It is a predictable consequence of high-volume eligibility verification in systems not designed for monthly tracking.

OBBBA is primarily a Medicaid law that also happens to be a Medicare law. Its direct Medicare provisions are modest. Its indirect effects on dual eligible populations, state fiscal capacity for integrated care programs, the LTSS ecosystem, and HI Trust Fund financing are substantial and will compound over the budget window as Medicaid enrollment contracts and state financing mechanisms shrink.

Related Reading

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MCR-00_01 The Trust Fund Clock MCR-09_01 Medicaid Work Requirements: The Dual Eligible Blind Spot MCR-05_13 Rural Medicare: Critical Access Hospitals, Ground Ambulance, and the Geographic Equity Problem MCR-09_05 Medicare Savings Programs: The Invisible Benefit Cliff