Medicare Supplement
Medigap A Through N: What Those Letters Actually Promise
Medigap A Through N: What Those Letters Actually Promise — plain-language Medicare information for Santa Ana, California.
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Key takeaways
- Medigap policies are sold by private companies but standardized by the federal government, so the letter tells you exactly what's covered.
- Medigap works only with Original Medicare — you cannot pair it with a Medicare Advantage plan.
- Your best pricing and guaranteed acceptance usually come during your six-month Medigap Open Enrollment Period, which starts when you're 65 and enrolled in Part B.
- Medigap does not include prescription drug coverage; you'll need a separate Part D plan for that.
SANTA ANA, Calif. — If you've ever stared at a Medicare Supplement brochure and wondered why the plans are labeled with letters like A, G, and N, you're not alone. Those letters aren't marketing shorthand. They're a federal system designed to make shopping easier — once you know how to read them.
Medicare Supplement Insurance, commonly called Medigap, works alongside Original Medicare to help pay some of the out-of-pocket costs Parts A and B leave behind. And here's the part many people miss: the benefits inside each lettered plan are set by law. That means a Plan G sold by one company covers the same things as a Plan G sold by another.
What Medigap actually does
Original Medicare (Parts A and B) pays a big share of your hospital and doctor bills, but not all of it. You're still on the hook for deductibles, coinsurance, and copays — and there's no yearly cap on what those out-of-pocket costs can add up to.
A Medigap policy fills in some or all of those gaps. Depending on the letter you choose, it may help cover the Part A hospital deductible, Part B coinsurance, skilled nursing coinsurance, the first three pints of blood, and even limited foreign travel emergency care.
Medigap does not cover prescription drugs, dental, vision, hearing aids, or long-term care. For medications, you'll enroll in a separate Part D plan.
Why the letters matter
Since 1992, federal law has required Medigap plans to follow a standardized format. Today, the plans available to new enrollees are labeled A, B, D, G, K, L, M, and N. (Plans C and F are still held by people who were eligible for Medicare before January 1, 2020, but they're not sold to newly eligible beneficiaries.)
Here's the practical takeaway: if two companies both sell Plan N, the benefits are identical. What differs is the premium, the company's customer service, and how they price the policy over time. That's why comparing on price and stability — not benefit lists — is the real work.
Massachusetts, Minnesota, and Wisconsin standardize their Medigap plans differently, but California follows the federal letter system.
How Medigap fits with the rest of Medicare
Medigap only works with Original Medicare. You cannot use a Medigap policy alongside a Medicare Advantage plan — the two systems are separate paths.
If you have Original Medicare plus a Medigap policy plus a stand-alone Part D drug plan, you're on the "Original Medicare route." If you choose a Medicare Advantage plan instead, that plan bundles hospital, medical, and usually drug coverage together, and Medigap isn't part of that picture.
Santa Ana is in Orange County, where residents have access to both Medicare Advantage plans and Medigap policies through multiple private carriers. Availability and pricing are set at the county and state level, so what your neighbor pays may not match your quote.
The enrollment window that matters most
The single most important date in Medigap is your Medigap Open Enrollment Period. It's a six-month window that starts the month you're 65 or older and enrolled in Part B. During that time, insurance companies must sell you any Medigap policy they offer at their best available rate, regardless of your health history.
Miss that window, and in most cases companies can use medical underwriting — meaning they can charge you more, or turn you down, based on preexisting conditions. There are some limited "guaranteed issue" rights outside that window (for example, if an employer plan ends), but they're narrower than most people expect.
This is the mistake to avoid: assuming you can wait and shop Medigap whenever it's convenient. The rules are much stricter after your initial window closes.
What Medigap does not do
A few things worth flagging so you're not surprised later:
- Medigap policies cover one person. Spouses need their own policies.
- Premiums are separate from your Part B premium, and they can rise over time.
- Newer plans (sold to those eligible on or after January 1, 2020) cannot cover the Part B deductible.
- Medigap is different from retiree coverage from a former employer — if you have both, ask how they coordinate before making changes.
By the numbers
Medicare Part B premium, 2006–2026
The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.
Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.
By the numbers
How people get Medicare in Orange County
(MA penetration in Orange County)
MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.
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The parts of Medicare
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When can you enroll? An interactive year
Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.
Good to know
Frequently asked questions
Can I switch from Medicare Advantage to Original Medicare with a Medigap plan?
Do I still need Part D if I have a Medigap plan?
Are all Medigap Plan G policies the same?
Where can I get unbiased help comparing Medigap plans?
- CMS — Medicare basics (medicare.gov)
For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.
Also for Santa Ana
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This page was last updated: September 2026.