People expect a cross-country move to change their health coverage. What surprises them is that moving one town over can do it too.
Plan availability is set by county
Medicare Advantage and Part D plans are approved to operate in specific service areas, defined at the county level. The plans offered, the benefits attached to them, the premiums and the networks all vary from one county to the next.
That produces the situation we see a few times a year locally: someone in Marlborough compares plans with a friend in Northborough, the numbers do not match, and both assume one of them misread something. Neither did — Marlborough is in Middlesex County and Northborough is in Worcester County, and the plan slates are genuinely different.
The two towns are about ten minutes apart.
What happens if you move and do nothing
Depends on where you moved.
Still inside your plan’s service area. Usually nothing breaks, though the network of providers convenient to your new address may be thinner than the one near your old one. Worth checking rather than assuming.
Outside your plan’s service area. This is the problem case. Your plan may not be able to serve your new address properly, and coverage away from the service area is typically limited to emergency and urgent care on most HMOs. In some cases the plan will disenroll you, and if you have not chosen a replacement you can end up back on Original Medicare with no drug coverage — and a late-enrollment penalty accruing.
The window, and how to get the longer version
A permanent move to a new plan service area is a qualifying event that opens a Special Enrollment Period.
Tell the plan before you move, not after
If you notify your plan before the move, the window generally runs the month of the move plus two months after.
If you tell them afterwards, it generally runs the month you notify them plus two months — so every month you delay is a month of the window spent.
Same rule, two quite different amounts of room.
Medigap is the exception
If you are on Original Medicare with a Medicare Supplement, a move is far less disruptive. Medigap has no network — it works with any provider in the country who accepts Medicare — so your coverage travels with you.
Two caveats: premiums can differ by state, and a few states run their own standardized plan sets rather than the federal letter plans. Massachusetts is one of them, which matters if you are moving in or out.
Your standalone Part D plan does still need checking, because that is set by county like everything else.
The checklist
- Tell your plan before you move if you possibly can — it lengthens your window.
- Update your address with Social Security, which handles Medicare enrollment records.
- Check the plan slate for your new county, not your new state.
- Re-check every doctor. New address, new convenient providers, possibly new networks.
- Re-run your prescriptions — pharmacy networks are also county-level, and the preferred pharmacy near your old house may be standard near the new one.
- If you are on Medigap, confirm the premium and whether your new state uses different plan designations.
Snowbirds and split households
If you spend part of the year in another state, the question is not “where did I move” but “where do I actually live.”
Most Advantage HMOs cover only emergency and urgent care outside the service area, which travels badly. A PPO handles it better. Original Medicare with a supplement handles it best of all, because there is no service area at all.
If your year is genuinely split, that fact alone often decides the structural question. It is worth raising early rather than discovering it during a February doctor’s visit two states away.
Just moved, or about to?
Tell us the new ZIP code and we will confirm what is available there, whether your doctors are in network, and how long your window runs. There is no fee.
See where we work or get in touch.
Frequently asked questions
How long is the Special Enrollment Period after a move?
It depends on when you tell the plan. If you notify them before you move, the window generally runs the month of the move plus two months after. If you tell them afterwards, it generally runs the month you notify plus two months. Telling them early gives you more room.
Does moving affect a Medigap policy?
Medigap policies have no network and work with any provider nationwide accepting Medicare, so a move does not disrupt coverage the way it can with a network plan. Premiums can still differ by state, and some states have their own standardized plan sets.
What if I move to a different county in the same state?
County is what matters for Medicare Advantage and Part D, not state. Two towns a few miles apart in different counties can have entirely different plan slates.