Quick Answer
Plan A covers only the core basics – coinsurance and a few gap costs – while Plan G covers nearly everything Medicare doesn’t, apart from the Part B deductible. Plan A usually costs less per month but leaves more expenses exposed, while Plan G carries a higher premium in exchange for far more predictable, comprehensive coverage. Most people working with a licensed medicare insurance agent find that Plan G ends up being the better value once you factor in how much less you’ll pay out of pocket during a hospital stay or a heavy medical year.
What Medigap Plans Are Actually Meant to Do
Medicare Supplement, or Medigap, plans exist to fill the gaps left behind by Original Medicare – the deductibles, copays, and coinsurance that Part A and Part B don’t fully cover. Every lettered plan (A through N) offers a standardized set of benefits, meaning a Plan G from one insurance company covers the same things as a Plan G from another. The only real differences between companies are price, customer service, and financial stability, which is exactly why comparing plans with a knowledgeable medicare insurance agent matters more than just picking the first quote you see.
Plan A and Plan G sit at opposite ends of the coverage spectrum. Plan A is the most basic Medigap option available, while Plan G is one of the most comprehensive plans currently open to new enrollees, since Plan F was closed to anyone newly eligible for Medicare after January 1, 2020.
What Medigap Plan A Covers
Plan A is the entry-level Medigap option, and it covers a limited but meaningful set of benefits:
- Part A coinsurance and hospital costs for up to an additional 365 days after Medicare benefits are used up
- Part B coinsurance or copayment, typically 20% of approved charges
- The first three pints of blood used in a medical procedure
- Part A hospice care coinsurance or copayment
What Plan A does not cover is just as important: it skips the Part A deductible, the Part B deductible, Part B excess charges, skilled nursing facility coinsurance, and any foreign travel emergency coverage. This makes it a fairly bare-bones option, best suited for someone who wants the lowest possible premium and doesn’t expect to need much medical care.
What Medigap Plan G Covers
Plan G takes a much broader approach. It covers nearly every gap Original Medicare leaves open, including:
- Part A deductible, coinsurance, and hospital costs, including the extra 365 days of hospital coverage
- Part B coinsurance or copayment
- Skilled nursing facility coinsurance
- Part A hospice care coinsurance or copayment
- The first three pints of blood
- Part B excess charges, which are extra amounts some providers can legally charge above the Medicare-approved rate
- 80% of foreign travel emergency costs, up to plan limits
The only thing Plan G doesn’t cover is the annual Part B deductible, which enrollees pay out of pocket before coverage kicks in. Once that deductible is met, Plan G functions almost identically to the now-closed Plan F, which is why so many financial advisors and insurance agents point new enrollees toward it.
Comparing the Costs
Monthly premiums for Plan A are typically lower than Plan G, sometimes significantly so, because Plan A covers so much less. But that lower premium comes with a trade-off: if you have a hospital stay, need skilled nursing care, or see a doctor who charges excess fees, you could end up paying thousands more out of pocket in a single year with Plan A than you would with Plan G.
Plan G’s higher premium buys predictability. Aside from the annual Part B deductible, your major medical costs are essentially capped, which many retirees on a fixed income find more manageable than facing unpredictable bills during a health crisis. This is one of the main reasons people frequently compare medicare advantage plans and Medigap plans side by side before making a decision – the “cheaper” option on paper isn’t always cheaper in practice.
Medigap vs. Medicare Advantage: A Quick Distinction
It’s worth pausing here, since Medigap and Medicare Advantage are often confused. Medigap plans like A and G work alongside Original Medicare, letting you see any provider nationwide who accepts Medicare, with no network restrictions. Medicare Advantage plans, by contrast, replace Original Medicare with a private plan that typically includes its own network, and often bundles in extras like dental, vision, and prescription drug coverage.
If you’re weighing both paths, it helps to look closely at medicare advantage plan coverage in your area, since benefits, networks, and costs vary significantly by county and by carrier. Someone who wants nationwide access and predictable costs often leans toward Medigap, while someone who wants lower premiums and added benefits like dental or vision may prefer Medicare Advantage. Neither is universally better – it depends on your health needs, your budget, and how much flexibility matters to you.
Which Plan Fits You Best?
A few questions can help clarify the right direction:
- Do you want the lowest possible premium and accept more risk? Plan A, or another basic option, may fit.
- Do you want comprehensive coverage and predictable costs? Plan G is typically the stronger choice for most people.
- Do you travel internationally? Plan G’s foreign travel emergency coverage is a meaningful advantage Plan A doesn’t offer.
- Are you managing ongoing health conditions? Plan G’s broader coverage tends to reduce financial surprises during frequent care.
Because Medigap pricing depends heavily on age, gender, tobacco use, and location, actual numbers can vary widely between individuals, which is exactly the kind of detail a licensed agent can walk through with you using real quotes rather than estimates.
Conclusion
Plan A and Plan G represent two very different philosophies within Medigap coverage – one built around a minimal premium, the other built around minimal exposure to unexpected costs. For most people, medicare supplement plan g ends up offering the better overall value once real-world medical expenses are factored in, though Plan A can still make sense for someone in good health who wants to keep monthly costs as low as possible. Since every situation is different, it’s worth getting a personalized comparison rather than guessing. The team at California Medicare Agency works exclusively with Medicare, helping California residents compare Plan A, Plan G, and Medicare Advantage options side by side so you can choose coverage that actually fits your health and your budget.
Frequently Asked Questions
1. Is Plan G more expensive than Plan A?
Yes, Plan G typically has a higher monthly premium than Plan A, but it covers far more, often reducing your total costs during a hospital stay or major illness.
2. Does Plan A cover the Part B deductible?
No. Plan A doesn’t cover the Part A or Part B deductibles, which are two of its biggest coverage gaps compared to Plan G.
3. Can I switch from Plan A to Plan G later?
Yes, but you may face medical underwriting outside your initial enrollment window, so switching isn’t always guaranteed or immediate.
4. Does Plan G cover care outside the United States?
Yes, Plan G covers 80% of emergency care costs abroad up to plan limits, while Plan A offers no foreign travel coverage at all.
5. Should I compare Medigap and Medicare Advantage before choosing?
Yes. Coverage, networks, and costs differ significantly, so comparing both with an agent helps ensure you pick the right fit.