Moved to a New County? The Special Enrollment Period Most People Miss

Most people assume that moving only affects their Medicare coverage if they cross a state line. That is not true. If your Medicare Advantage or Part D plan is only offered in certain counties — which most are — moving to a new county, even within the same state, can trigger a Special Enrollment Period (SEP).

Why County Lines Matter

Medicare Advantage and Part D plans are approved for specific service areas, usually defined by county. When you move outside that service area, your current plan may no longer be available to you, and Medicare gives you a window to pick a new one without waiting for the Annual Enrollment Period.

How Long the Window Lasts

If you tell your plan about the move before it happens, your SEP starts the month before you move and runs for two full months after. If you notify your plan after moving, the SEP starts the month you tell them and also runs for two months after that. Either way, timely notification matters — waiting too long can shrink your window.

What Happens If You Do Nothing

If you do not act within your SEP, you could be stuck with a plan that no longer covers your new local doctors and pharmacies until the next Annual Enrollment Period rolls around in the fall. That can mean months of paying for a network you cannot actually use.

What to Do When You Move

• Notify your current plan of your new address as soon as you know your move date
• Ask specifically whether your new county is inside the plan's service area
• If it is not, use your SEP to compare plans available at your new address
• Keep documentation of your move date in case you need to prove your SEP eligibility later

A move is a good moment to re-shop your coverage entirely, not just find a like-for-like replacement — your new area may have better options than what you had before.