As of 2026-09, federal Medicaid may not pay for the care of an inmate of a public institution outside three statutory exceptions — a 2024 law barred ending enrollment at incarceration and, CMS wrote, left that payment exclusion unchanged

What is happening?

The federal Medicaid statute defines what counts as payable medical assistance, and a closing clause of that definition, 42 U.S.C. 1396d(a), subparagraph (A), takes out care and services for any individual who is an inmate of a public institution. The clause carries only three parenthetical exceptions: a person who is a patient in a medical institution, certain screening, diagnostic, referral and targeted case management services for eligible juveniles under 1396a(a)(84)(D), and, at state option, eligible juveniles who are awaiting disposition of charges. CMS calls this rule the inmate payment exclusion and lists the same three exceptions in its informational bulletin of 2025-12-23.

Being an inmate does not end eligibility. CMS writes in the same bulletin that inmate status is not a condition of Medicaid eligibility and does not cause a loss of it, and that an inmate is a person involuntarily held under the authority of law enforcement, at any age. What stops is payment, not eligibility.

In 2024 Congress moved one of the two rules and not the other. Section 205 of Division G, Title I of the Consolidated Appropriations Act, 2024, signed 2024-03-09, bars states from 2026-01-01 onward from terminating Medicaid or CHIP eligibility solely because a person is incarcerated, adults included. CMS wrote on 2025-12-23 that this amendment makes no change to the inmate payment exclusion.

For adults, the only route around the exclusion is a Section 1115 demonstration. CMS opened the Reentry Section 1115 Demonstration Opportunity on 2023-04-17 in State Medicaid Director letter SMD 23-003, and in a September 2026 set of frequently asked questions it set the pre-release window for future approvals at up to 60 days for prisons, jails and adult tribal correctional facilities, and up to 90 days for youth correctional facilities. The CMS program page lists 22 approved jurisdictions, 21 states and the District of Columbia, on a page that carries no date; the count here is as of viewing on 2026-09-27.

Whose problem is this?

The body that set the exclusion is Congress, and the body that can relax it without new legislation is CMS through case-by-case approvals. Neither the people in custody nor the counties that run jails hold either lever.

Where does this problem end?

The boundary is drawn around the payment rule rather than the eligibility rule, because the 2024 law already separated the two and only one of them was changed by it.

What is the state now, and what should it be?

Now

Needs a new measurementno statute, regulation or agency document opened here sets a target for what federal Medicaid should pay for adults while they are in custody. What exists is a mandatory pre-release service obligation for eligible juveniles and the stated goals of the demonstration, and neither is a target for adult inmates. A 30-day pre-release window proposed in bills reintroduced in 2025 is a proposal, not a standard, and is not used here as one.

How big is it?

not-derivable is the result for the affected population. The number that would size this problem, people in custody who are eligible for or enrolled in Medicaid, does not appear in any source opened here, and the federal dollars not paid because of the exclusion do not appear either.

What can be stated are the custody counts from BJS, each with its own date, which are not added together here because their reference dates differ:

The prison figure includes federal prisoners, whom the demonstration is not expected to reach, so it cannot serve as the base for the population a demonstration could touch. CMS itself notes in its 2023 letter that health care spending data for local jails is not readily available, because jail funding is spread across several local agencies.

Under what conditions does it arise?

1. The exclusion attaches to custody status, not to income or place. A person who is eligible on the day of arrest remains eligible inside, yet federal payment stops for as long as the person is an inmate of a public institution. The CMS definition turns on involuntary custody under law-enforcement authority, so it does not wait for a conviction.

2. Eligibility and payment are governed by different provisions. Congress changed the eligibility side in 2018 for juveniles and in 2024 for everyone, while the payment side sits in the definition of medical assistance and was left as written.

3. Relief is discretionary and state by state. Each state must apply for a demonstration and CMS must approve it. The length of the pre-release window is not fixed in the statute beyond the 30-day ceiling on what the SUPPORT Act guidance was to cover; CMS set 90 days in 2023 as a condition of its general demonstration authority and reset it to 60 days for future adult approvals in 2026.

4. The demonstration is not designed to move costs. CMS writes that the exclusion rests on the understanding that correctional authorities pay for inmate care, that a demonstration does not relieve them of their constitutional duty, and that states must reinvest the new federal share in services, with a reinvestment plan. That wording was already in the 2023 letter.

The practical effect is that the same person, holding the same eligibility, receives federally funded care before arrest and after release and loses it in between, unless a state has sought and received an exception for a window before release.

What has been tried?

Every change so far has either worked on eligibility or created a time-limited, state-by-state window under demonstration authority. None of the attempts listed here altered the payment clause itself.

What was found?

Why is it still unsolved?

Institutional exemption — the exclusion is written into the definition of what Medicaid pays for, and every remedy adopted so far works around that definition instead of through it.

The payment bar sits in the federal statute, so only Congress can remove it. What Congress has done instead is to protect enrollment: first for juveniles in 2018, then for everyone from 2026. That protects the paperwork a person needs on the day of release, but it leaves the period inside untouched, and CMS has said so plainly in its own bulletin.

The relief that does exist is a demonstration, which by design is a test rather than a rule. A state has to apply, CMS has to approve, and the terms are set by CMS guidance rather than by statute. That guidance has already moved once for future approvals, from up to 90 days to up to 60 days for adult facilities, and the September 2026 questions and answers do not say whether earlier approvals change. A nonprofit waiver tracker reports that one state withdrew its approved waiver in December 2025, and no source opened here establishes why.

The third layer is that the cost of care in custody has no single ledger. CMS itself writes that jail health spending data is not readily available because the money is spread across local agencies. A cost that nobody can total is difficult to weigh against the federal share that the statute withholds, and the sources opened here do not attempt that comparison.

What observation would mean it is solved?

Candidates — (a) the statutory definition in 42 U.S.C. 1396d(a) is amended to allow federal payment for some services to adult inmates beyond the current three exceptions (b) reentry demonstrations are approved in every state that applies, with a stated and stable pre-release window (c) a published federal count of Medicaid-eligible people in custody, and of the federal share actually paid for them before release, appears and rises.

(a) alone depends on what the amendment says. A narrow change, for example one limited to a short window before release, would relax the exclusion without removing it, and the period between admission and that window would remain unpaid.

(b) alone is not permanent. Demonstrations are time-limited and depend on guidance that has already changed once for future approvals; one approved state has already withdrawn. A demonstration map can expand in one year and contract in the next without any change to the statute.

(c) alone does not yet exist. No source opened here gives either number, so there is no baseline against which a change could be read. The three have to be read together, and (c) is the one that would show whether (a) or (b) reached people.

What is it connected to?

Related problems already in this corpus sit on neighbouring axes. The Medicaid coverage gap in states that did not expand eligibility concerns who is eligible by income and by state choice, while this problem concerns people who are already eligible and lose federal payment because of custody. Federal benefit exclusion for residents of the territories turns on place, while this one turns on status and ends at release. Documents on incomplete data about deaths in custody and on unenforced prison rape elimination standards concern data and standards inside the same facilities, while this one concerns who pays for the care delivered there.

The juvenile pre-release obligation under CAA 2023 section 5121 is the nearest example of a mandatory, non-demonstration exception, and it applies only to eligible juveniles.

What these sources do not say

• How many people in custody are eligible for or enrolled in Medicaid. No source opened here gives this number, and it is the one that would size the problem.
• How much federal money the exclusion withholds. A Congressional Budget Office cost estimate page for a Medicaid reentry bill exists, but it could not be opened, so no figure is used.
• Whether the demonstrations have changed outcomes after release. CMS says rapid-cycle reports are forthcoming and publishes no outcome figures in its 2026 questions and answers. A California impact report could not be opened, so none of its figures are used.
• Which four jurisdictions were approved in September 2026, and whether those approvals carry the 60-day window.
• Whether approvals already granted with up to 90 days will change. The 2026 questions and answers speak only of future approvals.
• Why Michigan withdrew its approved waiver. The state page could not be opened.
• Whether annual reinvestment updates and a final reinvestment evaluation were already required in 2023. Parts of SMD 23-003 were not read, so these cannot be confirmed as new in 2026.
• The changes to non-service expenditures during implementation. CMS says details will be published later.
• The legislative origin of the exclusion and the reasons first given for it. Not examined here.
• Custody counts for adult tribal correctional facilities, and for state and local facilities with federal prisons removed. The BJS pages opened give only local jail and combined state and federal prison totals.
• Whether the exclusion causes worse health after release. HHS and MACPAC place the exclusion and post-release risks side by side; neither says it has measured a causal link, and no source opened here does.
• The position of CMS on the bills reintroduced in 2025 to change the exclusion. CMS sets out its own position on the demonstration in its questions and answers on goals, the 60-day window, cost shifting and the juvenile obligation. No source opened here carries a CMS position on the bills.

See the evidence

The statute text, the three CMS guidance documents, the CMS program pages, and the BJS tables were opened directly. The 22 approved jurisdictions come from a CMS page without a date and are stated as of viewing. The nonprofit waiver tracker and the national association of county governments are non-federal sources and are used for facts only. The 80 percent estimate and the 40-times overdose risk are carried at low grade because their underlying studies were not opened, and neither is presented as caused by the exclusion. This is a Path A output (research-based definition), so observation_refs is empty and provenance_mode: press-derived.

People affected

Estimated range Not derivable

The reason and what is missing are listed under “What is missing” below