A doctor can accept Medicare patients and still not accept Medicare assignment. That distinction can lead to an unexpected bill called an excess charge. Plan G excess charge coverage is designed to protect you from that particular gap, but it is most valuable in certain locations and provider situations. Knowing how it works can help you compare Medigap plans based on more than just the monthly premium.

What Are Medicare Part B Excess Charges?

Original Medicare sets an approved amount for covered medical services, including doctor visits, outpatient procedures, diagnostic tests, and durable medical equipment. Many doctors accept assignment, meaning they agree to accept Medicare’s approved amount as full payment for covered services. You remain responsible for your usual Medicare cost sharing, such as the Part B deductible and coinsurance.

Some providers do not accept assignment. They may still see Medicare patients and bill Medicare, but they can charge more than Medicare’s approved amount for a covered Part B service. That additional amount is an excess charge.

Under federal rules, the charge is generally limited to 15% above Medicare’s approved amount. For example, if Medicare approves $200 for a covered service, a non-participating provider could charge up to $230. Medicare and a supplement may pay their portions based on the $200 approved amount, leaving you responsible for the extra $30 unless your Medigap policy covers excess charges.

The 15% limit applies to individual covered services. It is not necessarily 15% of your entire medical bill. A few excess charges may be manageable, but repeated visits, specialist care, or higher-cost outpatient services can add up.

How Plan G Excess Charge Coverage Works

Medicare Supplement Plan G pays 100% of Medicare Part B excess charges after you have met the annual Part B deductible. This benefit is standardized in most states. In practical terms, a Plan G policy from one carrier must provide the same core excess-charge benefit as Plan G from another carrier, even though premiums, underwriting practices, customer service, and rate history can differ.

Plan G also pays the Medicare-approved Part B coinsurance after your deductible, along with several other significant gaps in Original Medicare. The key limitation is the Part B deductible itself. Plan G does not pay that deductible, so you pay it before Plan G begins paying eligible Part B cost sharing.

This coverage applies to Medicare-approved services and charges. It does not turn an uncovered service into a covered one, and it does not remove the need to follow Medicare rules. If Original Medicare does not cover a service, Plan G generally will not pay for it.

It also does not mean every provider can bill whatever they want. Federal limiting-charge rules still apply, and state rules may provide even stronger consumer protections.

Assignment matters more than many people realize

A participating Medicare provider accepts assignment for all Medicare-covered services. A non-participating provider can decide whether to accept assignment on a claim-by-claim basis. If that provider does not accept assignment, excess charges may apply.

Before making an appointment, ask the office two direct questions: “Do you accept Medicare assignment?” and “Will I be responsible for any amount above Medicare’s approved charge?” The billing department can often give a clearer answer than a general scheduling desk.

If a specialist is central to your care, it is worth confirming this before choosing a Medigap plan. A low premium is helpful, but the plan should also fit the providers you expect to use.

Where Excess Charges May Not Be a Concern

Excess charges are not allowed in every state. Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island, and Vermont have rules that prohibit or restrict them. If you live in one of these states, the excess-charge feature of Plan G may have less practical value.

That does not automatically make Plan G the wrong choice. Plan G includes other strong benefits, and your decision should still account for your premium, anticipated health care use, travel needs, and comfort with out-of-pocket expenses. It simply means you should not pay more for Plan G solely because you are worried about an expense your state already prevents.

Provider habits matter, too. In many communities, most physicians accept Medicare assignment, so patients rarely encounter excess charges. In other areas, especially where you see a particular specialist or travel frequently for care, the protection may be more relevant.

Plan G Versus Plan N for Excess Charges

Plan G and Plan N are often compared because both can provide broad Medicare Supplement coverage, but they handle Part B excess charges differently.

Plan G pays covered Part B excess charges after the Part B deductible. Plan N does not. With Plan N, you may pay excess charges yourself if you use a provider who does not accept Medicare assignment. Plan N can also include copayments for certain office and emergency room visits, while Plan G generally covers the Part B coinsurance in full after the deductible.

In exchange, Plan N often has a lower monthly premium. For a person who routinely uses providers that accept assignment and lives in a state where excess charges are prohibited, Plan N may be a sensible way to reduce premium costs. For someone who wants more predictable Part B expenses or prefers not to monitor assignment status closely, Plan G can be the more comfortable fit.

There is no one correct answer. The better choice depends on the premium difference in your area, your provider network habits, and how much financial uncertainty you are willing to accept.

Plan G and Plan F are different for new Medicare beneficiaries

Plan F also covers Part B excess charges and pays the Part B deductible. However, Plan F is generally unavailable to people who became eligible for Medicare on or after January 1, 2020. If you were eligible for Medicare before that date, you may still be able to apply for Plan F, depending on your situation and what is available in your state.

For many people newly eligible for Medicare, Plan G is the closest broad-coverage option because it covers nearly all of the same Medicare cost sharing except the Part B deductible.

How to Decide Whether This Benefit Is Worth Paying For

Start by looking beyond the plan letter. Because Plan G benefits are standardized, the real comparison often comes down to carrier pricing, rate increases over time, available household discounts, and the underwriting rules that apply when you enroll.

Then consider your own care pattern. If you have established doctors, call their offices to confirm whether they accept assignment. If you see multiple specialists, travel between states, or want the freedom to use any Medicare provider without worrying as much about billing practices, Plan G’s excess-charge protection can provide welcome peace of mind.

It is also wise to consider timing. Your Medigap Open Enrollment Period begins when you are both 65 or older and enrolled in Medicare Part B. During that window, you generally have important protections when buying a Medigap policy. Waiting until you have health issues or want to switch plans later can mean medical underwriting in many states, and approval is not guaranteed.

A licensed Medicare agent can compare Plan G rates from multiple carriers and explain whether excess charges are likely to matter where you live. At eMedicareGuide, that conversation can help you separate meaningful coverage differences from features that may not affect your actual bills.

Before you choose, focus on the doctors you use, the state where you live, the premium you can sustain, and the amount of out-of-pocket uncertainty you are comfortable carrying. The right Medigap policy should make it easier to get care with confidence, not leave you guessing what a routine appointment may cost.