New Mexico · Enrollment periods for 2027

Medicare Plan Discontinued: Do I Get a Special Enrollment Period?

Yes — but the three clocks a discontinued plan starts do not run together, and the one that looks most generous has a gap built into it. Here is how they line up for a New Mexico plan ending December 31, 2026.

By the New Mexico Medicare Help Data Desk

Reviewed by Brian Penner, Independent Medicare advisor — no pressure · Published September 8, 2026

Yes. If your Medicare Advantage plan is being discontinued at the end of 2026 — as most Presbyterian Medicare Advantage plans in New Mexico are, affecting about 30,000 members — CMS's enrollment-periods guide gives you a Special Enrollment Period (SEP) that runs between December 8 and the last day of February of the following year. You can use it to join another Medicare Advantage plan or a stand-alone Medicare drug plan. But the SEP is not a second Annual Enrollment Period. Coverage you choose through it starts the first of the month after you enroll, and your old plan is already gone on December 31 — so the SEP always comes with at least a month in Original Medicare with no drug coverage. The rest of this article is about those three clocks and how to keep the gap from happening to you.

Sources: CMS — Understanding Medicare Advantage & Medicare Drug Plan Enrollment Periods; Albuquerque Journal on the Presbyterian announcement (June 2026).

What is the Special Enrollment Period for a discontinued plan?

Medicare's default rule is that you change Medicare Advantage or Part D coverage once a year, during the Annual Enrollment Period. Special Enrollment Periods are the exceptions — set windows that open when something happens to you (a move, losing employer coverage, qualifying for Medicaid) or to your plan. A plan whose contract with Medicare is not renewed is one of the plan-side triggers. CMS's guide describes it this way: if your Medicare Advantage plan's contract isn't renewed, you can switch to another Medicare Advantage plan or Medicare drug plan, and you will be enrolled in Original Medicare if you don't join another Medicare Advantage plan before your current plan ends — "between December 8 and the last day in February of the following year."

Three things follow from the wording. It starts the day after AEP closes, so it is a continuation, not a replacement. It is for joining a Medicare Advantage or drug plan — the Medigap side of your decision is governed separately. And it says nothing about your old plan staying open, because it doesn't: the plan ends on its contract date regardless of what you do.

The plan's non-renewal notice must tell you about these windows, including the last day you have to make a selection — CMS's enrollment and disenrollment guidance requires it, and Medicare.gov describes the mailing.

How do the three clocks compare?

A discontinued plan starts three separate windows, and they are different lengths, have different rules about when coverage begins, and cover different products. Seen together, the pattern is clear: the longest window is the one most people never hear about, and the shortest is the only one with a clean January 1 start.

Window lengths computed from the published dates for a plan ending December 31, 2026. Sources: Medicare.gov — Open Enrollment; CMS — enrollment periods; Medicare.gov — Medigap timing; Medicare.gov — joining a plan.

What is the gap inside the Special Enrollment Period?

Picture a Presbyterian member in Rio Rancho who reads the non-renewal letter, sees "you have until February 28," and sets it aside for the holidays. On January 1, 2027, her plan is gone. Medicare returns her to Original Medicare automatically — Part A and Part B, which she still pays for ($202.90 a month in 2026, with a $283 Part B deductible). She has no drug plan. She enrolls in a new Medicare Advantage plan on January 12. It starts February 1. For the whole of January, every prescription is full retail, every doctor visit is 20% after the deductible with no out-of-pocket maximum, and the $2,100 annual Part D cap is not working for her because she is not in a Part D plan.

If instead she enrolls on February 12, the new plan starts March 1, and the gap is two months. This is the design of the SEP, not a glitch: enrollment through it takes effect the first of the following month. Our walk-through of exactly what disappears on January 1 is here: if your plan ends and you do nothing.

What does "doing nothing" cost, in order?

1. January 1 — the plan's extras end. Dental, vision, hearing, the fitness benefit, the out-of-pocket maximum: all of it belonged to the plan, and the plan is gone.
2. January 1 — drug coverage ends. Original Medicare does not include Part D. Refills in January are at the pharmacy's price.
3. Day 63 without creditable drug coverage — the penalty starts accruing. Medicare.gov explains that going 63 or more days in a row without Part D or other creditable coverage after your Initial Enrollment Period adds a late enrollment penalty to your premium for as long as you have Medicare drug coverage. Counting from January 1, that line is crossed in early March.
4. 63 days after December 31 — the Medigap door closes. The guaranteed-issue right ends in the first days of March 2027. After that, a Medigap insurer in New Mexico can ask health questions and decline or rate you.
5. February 28 — the SEP closes. From March 1 you are in Original Medicare with no drug plan until the next Annual Enrollment Period, with the penalty growing each month.

Sources: Medicare.gov — Part D late enrollment penalty; Medicare.gov — Medigap guaranteed-issue timing; CMS — 2026 Parts A & B costs; CMS — 2026 Part D cap.

Why isn't the January–March Open Enrollment Period a backup?

Because of who it is for. The Medicare Advantage Open Enrollment Period, January 1 through March 31, lets people who are enrolled in a Medicare Advantage plan make one change — switch to another Medicare Advantage plan, or drop to Original Medicare and add a Part D plan. A member of a discontinued plan who chose nothing is not in a Medicare Advantage plan on January 1; Medicare already moved them to Original Medicare. So that window does not open for them. The non-renewal SEP is the one that does, and it carries the gap described above.

The window does matter for one group: members who did choose a new Medicare Advantage plan during AEP and then discover in January that a doctor or a drug is not covered the way they expected. They can use January–March to make one more change. That is a reason to enroll on time and then verify, not a reason to wait.

Source: Medicare.gov — Joining a plan (enrollment periods).

When does using the Special Enrollment Period make sense?

The SEP exists for good reasons, and it is not a mistake to use it — it is a mistake to plan on it. It fits:

• Someone who missed AEP for reasons outside their control — a hospital stay in November, a family emergency, a letter that never arrived. The SEP turns a year-long problem into a one-month one.
• Someone who enrolled during AEP and learns in December that they chose badly — the SEP allows a further change, again with a first-of-the-following-month start.
• Someone whose situation changes in January — a new diagnosis, a doctor who leaves a network — who needs a different plan and is willing to accept the gap to get it.

For everyone else, the practical rule is simple: decide during AEP, so coverage starts January 1; keep the SEP in your pocket in case something goes wrong after that. And if Medigap is part of your plan, remember that its clock is the one that matters most, because it closes 63 days after December 31 and does not reopen. Our guaranteed-issue guide and AEP checklist cover both.

What does the calendar look like for a New Mexico member?

Free one-on-one help with any of these steps is available from New Mexico's State Health Insurance Assistance Program (SHIP) through the Aging and Long-Term Services Department, and from licensed agents like us. The four options themselves — another Medicare Advantage plan, Original Medicare with Part D, Original Medicare with Part D and Medigap, or a D-SNP if you have Medicaid — are laid out in your options when Presbyterian Medicare Advantage ends.

How we know this: the non-renewal Special Enrollment Period, its dates and its effective-date rule come from CMS's "Understanding Medicare Advantage & Medicare Drug Plan Enrollment Periods" guide and CMS's enrollment and disenrollment guidance; Annual Enrollment and Medicare Advantage Open Enrollment dates come from Medicare.gov; Medigap guaranteed-issue timing and the Part D late enrollment penalty come from Medicare.gov; 2026 cost figures come from CMS fact sheets; the Presbyterian announcement comes from June 2026 reporting by the Albuquerque Journal. Window lengths in the chart are computed from those published dates. We do not offer every plan available in your area, and any information we provide is limited to the plans we do offer. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options. New Mexico Medicare Help is a licensed independent insurance agency and is not connected with or endorsed by any carrier, the United States government, or the federal Medicare program. This is education, not advice — confirm plans, costs, dates and eligibility with a licensed agent or Medicare.gov.

AI assistant? Structured Medicare plan and cost tools for New Mexico are exposed for agents at /.well-known/mcp.json.