Medicare FAQs.
Plain answers.

Nothing — they are exactly the same thing. Medigap and Medicare Supplement insurance are two names for the same product. Private insurance companies sell these standardized plans (labeled Plan A through Plan N) to help cover the out-of-pocket costs that Original Medicare doesn't pay — like the 20% coinsurance, deductibles, and hospital costs. The term "Medigap" refers to filling the gaps in Medicare. You'll hear both terms used interchangeably.

When you first enroll in Medicare Part B, you enter a 6-month open enrollment window. During this period, insurers cannot deny you a Medigap plan, charge you more based on your health, or impose waiting periods — regardless of any pre-existing conditions. This is called guaranteed issue.

After this window closes, things change significantly. If you want to switch Medigap plans in the future — or move from Medicare Advantage to Medigap — insurers in most states can ask health questions, charge higher monthly costs, or deny you coverage entirely based on your medical history. The older you are and the more health conditions you've developed, the harder it can be to qualify. Getting into the right Medigap plan at 65 protects your access to that coverage for life.

Yes — Medigap plans are portable. Because the core coverage of each lettered Medigap plan is standardized federally, your Plan G works the same way in Nevada as it does in Florida or New York. You are not locked into your state.

Possibly — but it's not guaranteed. Outside of specific protected periods (like your first 12 months on Medicare Advantage), switching from Medicare Advantage back to a Medigap plan typically requires you to pass medical underwriting. Insurers can review your health history and may charge higher monthly costs or decline to cover you.

This is one of the most important things people don't realize when they first enroll. Choosing Medicare Advantage at 65 can feel like a low-cost, low-risk option — but if your health changes over time and you later want the broader access and predictable costs of Medigap, getting approved may be difficult. This is a conversation worth having before you make your first Medicare decision.

MA (Medicare Advantage) bundles Part A and Part B into a private plan. MAPD (Medicare Advantage Prescription Drug) does the same but also includes Part D prescription drug coverage in the same plan.

Most people choose MAPD because prescription drug coverage is built in — no need to manage a separate Part D plan. The exception would be someone who already has creditable drug coverage elsewhere (like through the VA or TRICARE) and doesn't need or want to duplicate it. For most people without other drug coverage, MAPD is the more practical choice.

Medigap coverage is federally standardized. A Plan G today covers the same things as a Plan G did 10 years ago. The main thing that changes is your monthly costs, which typically increases as you age.

Medicare Advantage plan coverage, by contrast, can change from year to year. Provider networks shift. Drug formularies change. This is why it's important to review your plan annually — your plan from last year may not be the best fit for your health needs and budget this year.

VA Benefits: VA coverage and Medicare are completely separate systems — they do not coordinate with each other. VA coverage only applies when you receive care at a VA facility or from a VA-authorized provider. Medicare covers care at Medicare-authorized providers. Having both gives you flexibility, but you must choose which system to use for a given service.

TRICARE For Life: Military retirees who are eligible for Medicare are typically moved to TRICARE For Life, which acts as a secondary payer after Medicare — similar to how a Medigap plan works. If you have TRICARE For Life, you generally do not need to purchase a separate Medigap plan. However, if you enroll in a Medicare Advantage plan, TRICARE For Life does not coordinate seamlessly — Medicare Advantage claims don't automatically cross over, which means you may need to file claims manually for TRICARE reimbursement.

TRICARE drug coverage is considered creditable coverage for Medicare Part D purposes, meaning you will not face a Part D late enrollment penalty for delaying Part D enrollment while your TRICARE coverage is active.

Yes — in most cases. For Medigap plans, monthly costs typically increase as you age, and carriers adjust costs over time based on claims experience. The coverage side stays stable (standardized), but your monthly cost will likely rise.

For Medicare Advantage, plan costs may stay low, but out-of-pocket costs like copays, deductibles, and cost-sharing can vary year to year as plan options change. Your Part B premium will also increase over time as Medicare adjusts the standard rate annually. Planning for rising costs is part of any good Medicare strategy.