New Mexico Medicare · Medigap comparison

Medigap Plan G vs. Plan N in New Mexico: The 2026 Comparison

If you have chosen Original Medicare and a Medicare Supplement to go with it, two plans do most of the work in New Mexico: Plan G and Plan N. They cover nearly the same gaps, but the small differences — a few copays and one excess-charge rule — decide which fits your budget and how you use care. And starting in 2027, a new state law changes how easily you can switch between them.

By the New Mexico Medicare Help Data Desk

Reviewed by Brian Penner, Independent Medicare advisor — no pressure · Updated July 24, 2026

Neither Plan G nor Plan N is "better" for everyone — the choice comes down to how often you use care and how much you value predictable bills. Plan G costs a bit more each month but has no copays and covers Part B excess charges, so your out-of-pocket costs are small and steady. Plan N usually has a lower premium in exchange for copays of up to $20 on some office visits and $50 on a non-admitted ER visit, plus the risk of excess charges. Both cover the $1,736 Part A deductible and skilled-nursing coinsurance for 2026, and both leave you the $283 Part B deductible. If you see doctors often, Plan G's steadiness usually wins; if you rarely do, Plan N's lower premium can leave you ahead. This guide walks the real 2026 numbers and New Mexico's new birthday-rule law so you can decide.

What are Medigap Plan G and Plan N?

Medigap — also called Medicare Supplement — is a private insurance policy that pairs with Original Medicare (Parts A and B) and pays many of the out-of-pocket costs Medicare leaves behind: the deductibles, the 20% Part B coinsurance, hospital coinsurance, and more. Medigap does not include drug coverage, so most people add a stand-alone Part D plan alongside it.

Medigap plans are standardized. A plan letter means the same set of benefits no matter which insurance company sells it — a Plan G from one carrier covers exactly what a Plan G from another carrier covers. The only differences between carriers are price and service. Among the ten standardized letters, two dominate today's market for people newly on Medicare:

• Plan G is the most comprehensive plan available to people who became eligible in 2020 or later. It covers every standardized gap except the annual Part B deductible.
• Plan N covers the same gaps as Plan G with three exceptions: you pay a copay of up to $20 on some office visits, a copay of up to $50 on an emergency-room visit that does not lead to a hospital admission, and any Part B excess charges. In return, its premium is generally lower.

Sources: Medicare.gov — Medicare Supplement (Medigap); Medicare.gov — how to compare Medigap policies.

What does each plan cover in 2026?

Here is the side-by-side for the 2026 plan year. The dollar figures are the 2026 Medicare amounts each plan is measured against; both plans pay the same major items, and the differences sit in the last three rows.

Sources: Medicare.gov — Medigap benefits comparison; CMS — 2026 Medicare Parts A & B premiums and deductibles; Federal Register — CY 2026 Part A deductible and coinsurance amounts.

Plan N's two gaps: copays and excess charges

The whole Plan G versus Plan N decision really lives in two rows of that table. Understand them and the rest follows.

The copays. Under Plan N you pay up to $20 for some office visits and up to $50 for an emergency-room visit that does not result in you being admitted. These are small on any single visit. The question is how many visits you have in a year. Someone with two or three checkups will barely notice; someone managing a chronic condition with monthly specialist visits will feel it.

The excess charges. A "Part B excess charge" is an extra amount — up to 15% above the Medicare-approved rate — that a provider who does not accept Medicare "assignment" is allowed to bill. New Mexico is not one of the states that prohibit excess charges, so they can apply here. Plan G absorbs that charge; under Plan N you would owe it. In practice most New Mexico providers accept assignment and never bill an excess charge, but it is a real gap — and if you see out-of-area specialists or travel, it matters more.

Sources: Medicare.gov — how to compare Medigap policies; Medicare.gov — Medicare costs and assignment.

What do Plan G and Plan N cost in 2026?

No matter which supplement you pick, you still pay the Part B premium — $202.90 a month in 2026 (CMS) — plus the Medigap plan's own premium and, separately, a Part D drug plan. Medigap premiums are not standardized the way benefits are: they vary by carrier, your age, tobacco use, and where you live in New Mexico, so there is no single statewide price. What is consistent is the pattern:

• Plan G generally has a higher monthly premium, but no copays and no excess-charge exposure. After you meet the $283 Part B deductible, your covered Part B costs are essentially handled. It is the choice for predictable, low-surprise bills.
• Plan N generally has a lower monthly premium. You trade that saving for the $20 and $50 copays and the excess-charge risk. In a light year of care, the lower premium can leave you ahead; in a heavy year, the copays can catch up.

The honest way to compare is total expected cost for a year, not premium alone: take the premium difference between the two plans and weigh it against how many office and specialist visits you realistically expect. That is why the local health picture below matters — frequent visits change the math.

Source: CMS — 2026 Medicare Parts A & B premiums and deductibles.

New Mexico's new Medigap "birthday rule" starts in 2027

Here is the New Mexico–specific news that changes this decision. In March 2026 the governor signed Senate Bill 21 into law, creating an annual Medigap "birthday rule" that takes effect January 1, 2027. Starting then, a New Mexican age 65 or older who already holds a Medigap policy gets a 60 days window around their birthday each year to switch to another Medigap plan with the same or lesser coverage — with no medical underwriting. An insurer cannot deny you or charge more based on your health during that window.

Why this matters for the Plan G versus Plan N choice: before this law, once your one-time Medigap Open Enrollment window closed at 65, changing plans in New Mexico usually meant passing a health screening — a real barrier if your health had changed. The birthday rule removes that barrier once a year for moves to equal-or-lesser plans. Because Plan N is considered lesser coverage than Plan G, someone on Plan G could use the birthday rule to move down to Plan N — for example, to lower their premium — without underwriting. Moving up from Plan N to Plan G is a step up in coverage and generally would not be protected, so it could still require underwriting.

The law reaches roughly 71,380 New Mexicans who held Medigap coverage as of September 2024. It does not force anyone to change and it does not lower premiums by itself — it simply gives you a yearly, no-health-questions chance to re-shop. If you are choosing between G and N now, it is one more reason not to feel permanently locked in, though the direction of the move still matters.

Sources: NM Aging & Long-Term Services Department — Governor signs Medigap bill into law (March 2026); NM ALTSD — Senate Bill 21 (2026) overview; NM Legislature — SB 21 agency bill analysis (PDF).

When can you buy or switch Medigap in New Mexico?

Timing decides how easy — or expensive — a Medigap plan is to get. The key windows:

• Medigap Open Enrollment (the big one). This is a one-time, six-month window that starts the month you are 65 and enrolled in Part B. During it, any Medigap plan sold in New Mexico must accept you with no health questions and cannot charge you more for pre-existing conditions. This is the easiest time to buy either Plan G or Plan N.
• Guaranteed-issue rights. Certain life events — such as an employer plan or Medicare Advantage plan ending — can open a limited right to buy specific Medigap plans without underwriting, even outside your open-enrollment window.
• The new birthday rule (from January 1, 2027). Each year after 2026, your 60 days birthday window lets you switch to a same-or-lesser Medigap plan without health questions, as described above.
• Any other time. Outside those windows, a New Mexico insurer can use medical underwriting — reviewing your health and potentially declining you or charging more. That is why the first two windows are so valuable, and why the birthday rule is a meaningful addition.

Sources: Medicare.gov — when to buy a Medigap policy; NM ALTSD — SB 21 (2026).

What this means across New Mexico

Because the Plan G versus Plan N choice turns on how often you see doctors, local health patterns are part of the math. In Bernalillo County — home to Albuquerque and the state's largest population — chronic conditions that mean regular office visits are common among adults, according to the CDC's 2023 PLACES estimates:

Source: CDC PLACES, 2023, Bernalillo County, NM adults (model-based crude prevalence; values rounded). Rates vary by county across New Mexico.

The practical read: if you live with high blood pressure (34%), arthritis (25%), or diabetes (12%) — as many New Mexicans do — you are likely making regular office and specialist visits, and Plan N's $20 copays recur with each one. For frequent users, Plan G's no-copay predictability often pencils out even at a higher premium. For someone who rarely visits a doctor, Plan N's lower premium can be the better value. New Mexico spans dense metro networks and wide rural stretches alike, so run the numbers on your care, not a statewide average.

How to choose between Plan G and Plan N

Five steps cut through it faster than any premium chart:

1. Estimate your yearly visits. Count routine, specialist, and likely ER visits. Multiply by Plan N's $20/$50 copays to see your realistic copay total.
2. Compare that to the premium gap. Ask for the actual Plan G and Plan N premiums for your age and ZIP, then weigh the yearly difference against your expected copays.
3. Factor in excess-charge risk. If you see providers who may not accept assignment, or you travel and use out-of-area doctors, Plan G's excess-charge coverage is worth more.
4. Buy during a no-underwriting window. Your six-month Medigap Open Enrollment at 65 — or a guaranteed-issue right — is the time to lock in either plan with no health questions.
5. Remember the birthday rule. From January 1, 2027, you can move to a same-or-lesser plan each year without underwriting, so a Plan G choice today is not permanent — but a move up to richer coverage later may still require underwriting.

Sources: Medicare.gov — compare Medigap policies; Medicare & You 2026 handbook (PDF).

How we know this: the $202.90 Part B premium and $283 Part B deductible come from the CMS 2026 Parts A & B fact sheet; the $1,736 Part A deductible and $217/day skilled-nursing coinsurance come from the Federal Register CY 2026 notice; the Plan G and Plan N benefit differences, $20 and $50 copays, and excess-charge rule come from Medicare.gov's Medigap comparison; and the January 1, 2027 birthday rule and 71,380 enrollee figure come from New Mexico's Aging & Long-Term Services Department and the Legislature's SB 21 materials. Local chronic-condition rates are CDC PLACES 2023 estimates for Bernalillo County. Medigap premiums are set by each carrier and vary by age, tobacco use, and location — confirm current prices before you act. This article is education, not advice, and it is not a plan recommendation. 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 for information on all of your options. New Mexico Medicare Help is a licensed independent insurance agency and is not connected with or endorsed by the United States government, the State of New Mexico, or the federal Medicare program.

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