Transferring Medicaid from Illinois to Montana

Gather your documents before the move

You will reapply from scratch: proof of identity, income (pay stubs or award letters), your new address, and immigration documents if applicable.

Tell Illinois Department of Healthcare and Family Services (HFS) you are leaving

HFS directs customers to manage their case — including renewals and updates such as address changes — through the ABE (Application for Benefits Eligibility) 'Manage My Case' portal; use it or your local Family Community Resource Center to update or close your case.

Time the closure to the end of your move month

Keep coverage through the month you travel. Your old state's coverage generally ends the month you stop being a resident.

Apply with Montana Department of Public Health and Human Services (DPHHS) as soon as you arrive

There is no waiting period based on how long you have lived there — apply immediately. Processing: up to 45 days (90 if a disability decision is needed). From January 1, 2027 (earlier in some states), most adults in the expansion group must also show 80 hours a month of work, school, job training, or community service, or an exemption, possibly for 1 to 3 months preceding the application.

Ask about retroactive coverage

Most states can pay eligible medical bills from as early as the third month before the month you apply, so ask when you apply if you had care during the gap. For applications filed on or after January 1, 2027, federal law (Public Law 119-21) shortens this to the month before the month you apply for adults in the expansion group and the second month before the month you apply for everyone else.