Guides ยท Last reviewed October 28, 2026
Medicaid retroactive coverage: bills from before you applied
Medicaid.gov says benefits may be covered retroactively for up to three months prior to the month of application, if you would have been eligible during that period. CMS says that shortens for applications made on or after January 1, 2027.
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How it works
- Once you're found eligible, coverage is effective either on the date of application or the first day of the month of application.
- Benefits also may be covered retroactively for up to three months before the month of application, if you would have been eligible then had you applied.
- Coverage generally only reaches bills for services that Medicaid covers.
Example: if you apply in November 2026 after a hospital stay in August, ask whether the August bill falls inside the retroactive window and whether you met the eligibility rules in that month.
What's changing in 2027
A CMS informational bulletin dated November 18, 2025 explains Section 71112 of the 2025 law (Public Law 119-21). Today, states must give applicants retroactive eligibility for up to three months before the month of application. For applications made on or after January 1, 2027, retroactive eligibility will be limited to one month before the month of application for people in the Medicaid adult group (the ACA expansion group), and two months for everyone else. The same bulletin says separate CHIPs may keep offering retroactive eligibility but cannot begin coverage earlier than two months before the application month. Your state Medicaid agency can tell you which group you fall in and what applies in your state.
What to do if you have an unpaid bill
- Apply as soon as you think you may qualify. The sooner you apply, the more bills fall inside the window.
- Tell the hospital you've applied. Ask them to hold the account while Medicaid decides, and keep a copy of your application and date.
- Send the approval letter to the provider and ask them to bill Medicaid for covered dates.
- Ask about financial assistance for anything Medicaid doesn't cover. See hospital financial assistance.
Also see
Medicare Savings Programs for people with Medicare, and Special Enrollment Periods if you're deciding between Medicaid and a Marketplace plan.
Common questions
How far back can Medicaid pay?
Medicaid.gov says up to three months prior to the month of application, if you would have been eligible then. For applications made on or after January 1, 2027, CMS says it will be one or two months.
What changes in 2027?
CMS says that for applications made on or after January 1, 2027, retroactive eligibility will be limited to one month before the application month for the Medicaid adult group and two months for everyone else.
Does CHIP work the same way?
Not exactly. CMS says states may choose whether to offer retroactive eligibility in a separate CHIP, and from 2027 it cannot begin earlier than two months before the application month.
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Sources
CMS plans further guidance on Section 71112, so details may change. Confirm with your state Medicaid agency. Billmira is a self-help information tool, not a law firm, and this isn't legal, tax, or medical advice. Rules change and plans differ; check the official sources above and your own documents.