Here's the thing nobody tells you in September. Your parent's Medicare plan is about to send them a letter, every Medicare article on the internet is about to tell you to sit down and compare plans before December 7, and for a meaningful number of families that advice is going to produce a careful, well-researched decision about an address they will not be living at by spring.
I spent eight years buying houses from families in transition. The calls I remember most were not the ones where somebody made a bad decision. They were the ones where somebody made a good decision at the wrong moment, and then felt locked into it. A family would tell me they had already handled the insurance, already picked the plan, already done the hard October homework, so the move had to wait until next fall. It did not have to wait. Nobody had told them that.
So if your family is anywhere near a move right now, a move into assisted living, a move across town to be near you, a rehab stay that might not end at home, this is the piece worth ten minutes. Not because Open Enrollment does not matter. It does. Because the thing you are almost certainly not being told is that Medicare already has a door built for exactly your situation, and using it does not cost you the October window. You get both.
You do not need to become an expert. You need to know three dates, one definition, and the one question to ask before you compare a single plan.
What the Rules Actually Say
Start with the calendar, because two of these dates are the only ones most families ever hear.
Per Medicare.gov, the Open Enrollment Period runs October 15 through December 7, and a change made in that window takes effect January 1 of the next year, as long as the plan gets the request by December 7. That window is written into the regulation too: 42 CFR 422.62(a)(2)(iii) sets the annual coordinated election period as October 15 through December 7 for every year beginning in 2011.
Before that, the letter. Medicare.gov calls it the Plan Annual Notice of Change, and it says the plan sends it in September covering the changes in coverage and costs that take effect in January. The deadline behind it sits in 42 CFR 422.111(d)(2), which requires a plan changing its rules effective January 1 to notify every enrollee at least 15 days before the annual coordinated election period begins. Count back fifteen days from October 15 and you land on September 30. That letter is due in your parent's mailbox in the next three weeks.
Then there's a third date almost nobody mentions. Medicare.gov describes a separate Medicare Advantage Open Enrollment Period running January 1 through March 31, for people already in a Medicare Advantage plan.
And underneath all of it sit the Special Enrollment Periods, which are the part of this that actually fits a family in transition. Medicare.gov states that if your parent moves to a new address where new plan options are available, their chance to switch begins when they move and continues for two full months after. If they tell the plan before the move, that window opens the month before the move instead.
There's a more generous version for a stay in an institution. Medicare.gov states that the chance to join, switch, or drop coverage lasts as long as your parent lives in the institution, plus two full months after the month they move out.
The Word That Decides Which Door You Get
Here is where families get tripped up, and it is worth slowing down for, because the answer is counterintuitive.
"Institution" in this context is a defined term, and assisted living is not on the list.
The definition lives at 42 CFR 422.2. For purposes of the open enrollment period for institutionalized individuals, it means someone who continuously resides, or is expected to continuously reside, for 90 days or longer in a skilled nursing facility, a Medicaid nursing facility, an intermediate care facility for individuals with intellectual and developmental disabilities, a psychiatric hospital or unit, a rehabilitation hospital or unit, a long-term care hospital, or a swing-bed hospital.
Assisted living communities, independent living, memory care that is licensed as assisted living, and your spare bedroom are not in that list. That is not a technicality you can talk your way past on the phone, and it is not a reason to panic either. It just means your family is using the other door, the one for a change of permanent residence, which is available whenever the new address brings new plan options with it. Regulation 42 CFR 422.62(b)(2) says so directly, extending the special election period to people who have new plan options available as a result of a change in permanent residence.
The practical difference is duration. A skilled nursing stay long enough to count keeps the door open the whole time your parent is there, plus two months after. A move to assisted living gives you a defined window around the move.
Both are real. Both are more flexible than the one week in October your family has been told is their only shot.
The Network Is the Part That Actually Bites
Premiums are what families compare. Networks are what families feel.
The version of this I see most often: a parent moves twenty-five miles to be closer to a daughter. The plan is the same plan, the premium did not change, nothing looks broken. Then the cardiologist is out of network at the new address, the preferred home health agency the community works with does not contract with that plan, and the skilled nursing facility three minutes away, the one that would matter enormously if there's a fall in February, is not in the network either.
Nobody sent a letter about that, because nothing on the plan's side changed. Your parent moved.
Worth knowing for the other direction, though: when the plan is the one making the change, it owes your family notice. Under 42 CFR 422.111(e), when a Medicare Advantage plan terminates a contracted provider, it must give written notice and make one attempt at telephone notice at least 45 calendar days before the termination date if that provider is a primary care or behavioral health provider, and written notice at least 30 calendar days ahead for other specialties. If a doctor your parent sees regularly drops off, that notice is owed, and it is a legitimate thing to ask about if it never showed up.
What This Means for Your Family in the Next Three Weeks
The transformation here is small and specific. You stop guessing whether October is the moment, and you become the one who knows the sequence. Choose well for the address your parent lives at today, and keep the move's door in your back pocket. That is the whole strategy. The rest is execution.
Step 1: Find the letter before it gets thrown away
It arrives in September, it is beige, and it looks exactly like the marketing the plan sends all year. Ask your parent to set aside anything from their plan for the next three weeks, or ask permission to check the mail with them once. Medicare.gov's instruction if it never comes is simple: contact the plan directly.
Step 2: Answer the move question before you compare anything
Ask it out loud, in plain words. Is there a real chance the address changes in the next twelve months? A tour already scheduled, a waitlist deposit already paid, a rehab stay that might not end at home, a conversation the family keeps having. If the honest answer is yes, you're choosing a plan for the current address on purpose, as a bridge, and you're not going to agonize over it.
Step 3: Compare for where your parent lives right now
Use the October 15 to December 7 window the way it's designed. Check what changed in the letter, check that the current doctors and current pharmacy are still in network for next year, and make the request by December 7 so coverage starts January 1.
Step 4: Tell the plan before the move, not after
This is the step that pays. Medicare.gov says telling the plan ahead of a move opens the switching window the month before the move instead of the month of it. That extra month is the difference between choosing calmly and choosing from a hospital discharge planner's office. Put the new address in writing, keep a copy, and note the date you sent it.
Step 5: Write down the two-month clock
Whichever door your family ends up using, it closes. Two full months after the move for a change of address, two full months after the month your parent leaves an institution for that one. Put the closing date on the calendar the day the move happens, not later.
Frequently Asked Questions
When does Medicare Open Enrollment start and end in 2026?
Per Medicare.gov, the Open Enrollment Period runs October 15 through December 7. A change made in that window takes effect January 1 of the next year, and the plan has to receive the request by December 7. The same dates appear in the regulation at 42 CFR 422.62(a)(2)(iii).
When does the Annual Notice of Change arrive?
Medicare.gov says the plan sends the Plan Annual Notice of Change in September, and it covers the changes in coverage and costs that take effect in January. The underlying rule at 42 CFR 422.111(d)(2) requires notice at least 15 days before the annual coordinated election period begins, which places the deadline at September 30. If it does not arrive, Medicare.gov says to contact the plan directly.
Can my parent change Medicare plans after moving to assisted living?
Yes, if the new address brings new plan options with it. Medicare.gov states that when you move to a new address where new plan options are available, the chance to switch begins when you move and continues for two full months after, and that telling the plan before the move opens the window the month before instead. Assisted living does not qualify as an institution under 42 CFR 422.2, so this is the door that applies rather than the institutional one.
Does a nursing home stay give a longer window to switch plans?
It can. Medicare.gov states that for someone living in an institution, the chance to join, switch, or drop coverage lasts as long as they live there plus two full months after the month they move out. The definition at 42 CFR 422.2 covers a stay of 90 days or longer in settings including a skilled nursing facility, a nursing facility, a rehabilitation hospital or unit, and a long-term care hospital.
What if a doctor leaves the plan's network mid-year?
The plan owes notice. Under 42 CFR 422.111(e), a Medicare Advantage plan terminating a contracted primary care or behavioral health provider must give written notice and make one attempt at telephone notice at least 45 calendar days before the termination date, and must give written notice at least 30 calendar days ahead for other specialties.
About Ryan Riggins
Ryan Riggins is a senior transition advisor and former house flipper. After 8+ years buying homes from families in transition, he walked away from the cash-buyer side to help families avoid the $50K mistakes he used to profit from. Based in Greensboro, NC. NC Real Estate License #361546, eXp Realty. Founder of Riggins Strategic Solutions and the SeniorSafeApp app.
Want to see the holes before they cost you? The free Medicare Gap Analyzer walks through what Medicare does not cover in about three minutes, no email required: rigginsstrategicsolutions.com/tools/medicare-gap-analyzer
Want a step-by-step guide? The Senior Transition Blueprint is free, all 20 modules and 69 tools: rigginsstrategicsolutions.com/the-blueprint
Not sure where your family stands? The free Family Readiness Score takes five minutes and shows the gaps across the home, the money, the legal documents, care, and family alignment: rigginsstrategicsolutions.com/tools/family-readiness-score
Need a personalized plan? The Senior Transition Roadmap is free, by application. It adds calls with Ryan and 90 days of email support: rigginsstrategicsolutions.com/the-roadmap
Selling a parent's home? Ryan finds and vets the right local agent for your situation and stays in your corner on the whole sale, at no added cost to your family: rigginsstrategicsolutions.com/in-your-corner
Coordinate the family in one place. SeniorSafeApp keeps daily check-ins, medications, and documents where the whole family can see them: seniorsafeapp.com
Sources
All sources checked September 9, 2026.
- Medicare.gov, Joining a health or drug plan. Source for the Open Enrollment Period running October 15 through December 7 with coverage starting January 1 provided the plan gets the request by December 7, and for the Medicare Advantage Open Enrollment Period running January 1 through March 31. https://www.medicare.gov/basics/get-started-with-medicare/get-more-coverage/joining-a-plan
- Medicare.gov, Special Enrollment Periods. Source for the change-of-address window beginning when you move and continuing for two full months after, for the window opening the month before the move if you tell the plan first, and for the institutional window lasting as long as you live in the institution plus two full months after the month you move out. https://www.medicare.gov/basics/get-started-with-medicare/get-more-coverage/joining-a-plan/special-enrollment-periods
- Medicare.gov, Plan Annual Notice of Change (ANOC). Source for the plan sending the notice in September, for it covering changes in coverage and costs effective in January, and for Medicare's instruction to contact the plan if it does not arrive. https://www.medicare.gov/basics/forms-publications-mailings/mailings/costs-and-coverage/upcoming-plan-changes
- 42 CFR 422.111(d)(2) and 422.111(e), retrieved as XML from GovInfo. Source for the requirement to notify all enrollees of changes effective January 1 at least 15 days before the annual coordinated election period begins, and for the provider termination notice requirements of 45 calendar days with one telephone attempt for primary care and behavioral health providers and 30 calendar days written notice for other specialties. https://www.govinfo.gov/content/pkg/CFR-2025-title42-vol3/xml/CFR-2025-title42-vol3-sec422-111.xml
- 42 CFR 422.62(a)(2)(iii), 422.62(a)(4) and 422.62(b)(2), retrieved as XML from GovInfo. Source for the annual coordinated election period running October 15 through December 7, for institutionalized individuals not being limited in the number of elections or changes they may make, and for the special election period extending to individuals who have new plan options available as a result of a change in permanent residence. https://www.govinfo.gov/content/pkg/CFR-2025-title42-vol3/xml/CFR-2025-title42-vol3-sec422-62.xml
- 42 CFR 422.2, retrieved as XML from GovInfo. Source for the definition of "institutionalized" as continuous residence, or expected continuous residence, of 90 days or longer in a skilled nursing facility, nursing facility, intermediate care facility for individuals with intellectual and developmental disabilities, psychiatric hospital or unit, rehabilitation hospital or unit, long-term care hospital, or swing-bed hospital. https://www.govinfo.gov/content/pkg/CFR-2025-title42-vol3/xml/CFR-2025-title42-vol3-sec422-2.xml
The September 30 date stated in this post is arithmetic performed on the two cited regulations, counting back the 15-day notice margin in 42 CFR 422.111(d)(2) from the October 15 start of the annual coordinated election period in 42 CFR 422.62(a)(2)(iii). It is not a separate CMS statement.
