It’s important to understand the soup of abbreviations you encounter in Medicare.
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People trying to figure out Medicare can get tripped up by the labels of the different types of coverage. Here are three examples.
“I am enrolled in Part A and Part B and want to get Part G.”
“I need to find a Plan D that will cover my medications.”
“I signed up for Part C but I still need to get a PPO.”
I could go on but you get the gist. Medicare’s alphabet soup identifies different types of coverage while creating confusion. Fitting the letters into a structure can help clean up the landscape.
Medicare teaches that there are four parts of Medicare. However, in my view, there are really three essential parts.
When first signing up for Medicare, everyone is enrolled in Part A and Part B, known as Original Medicare. Then they have a choice.
- Stick with just Part A and Part B. This has one big downside – unlimited out-of-pocket costs.
- Add a Medicare supplement plan (Medigap policy) and Part D drug plan to Part A and Part B. A Medigap policy limits out-of-pocket costs. Pay the monthly premium, see doctors and providers who accept Medicare, and out-of-pocket costs are limited to the Part B deductible, $283 this year. Part D helps pay for prescription medications.
- Elect Medicare Advantage. This is also known as Part C. However, it is not a part but rather a package. Medicare calls this “all-in-one alternative to Original Medicare,” bundling hospital and medical services (Part A and Part B) and incorporating Part D. In other words, Part A plus Part B plus Part D equals Medicare Advantage.
That covers the parts of Medicare. Now here’s where letters and plans come into play.
- Lettered Medigap plans: Over 30 years ago, Medicare standardized Medigap policies and identified the different plans by letters. In 2026, there is Plan A, B, C, D, F, G, K, L, M and N – a total of 10 plans (not parts).
- Medicare Advantage initialisms: These plans are identified by abbreviations made up of first letters: Part C plans can be a preferred provider organization plan (PPO), a health maintenance organization (HMO), special needs plan (SNP), medical savings account (MSA), and private fee-for-service (PFFS).
So, when trying to interpret the alphabet soup, remember these points.
- Parts refer to the core of Medicare – Part A, Part B, and Part D.
- Single letters identify Medigap policies that work with Part A and Part B.
- Three- or four-letter abbreviations identify Medicare Advantage or Part C plans.
