Medicare Supplement Plan C: Coverage, Costs, and Eligibility

Medicare Supplement Plan C is a standardized Medigap policy that helps pay several costs left by Original Medicare. It is important to understand one eligibility limit first: people who became newly eligible for Medicare on or after January 1, 2020 generally cannot buy Plan C. If you were eligible before that date, Plan C may still be an option, depending on availability and your circumstances.

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The letter can cause confusion because Medicare Advantage is also known as Part C. A Medicare Supplement Plan C is different: it works alongside Original Medicare, while Medicare Advantage is another way to receive Medicare-covered services. The sections below explain what Medigap Plan C covers, who can enroll, what affects its price, and how to compare it with other choices.

What does Medicare Supplement Plan C cover?

Original Medicare consists of Part A hospital insurance and Part B medical insurance. It pays its share of covered services, but beneficiaries may still have deductibles, coinsurance, and other cost-sharing. A Medigap policy is private insurance that can help pay some of those out-of-pocket costs. Plan C has a defined set of benefits, so a Plan C policy from one insurer has the same standardized core benefits as a Plan C policy from another insurer in the same state.

Plan C generally covers the following Medicare cost-sharing amounts:

• Part A coinsurance and hospital costs: This includes Part A coinsurance, plus coverage for up to 365 additional hospital days after Original Medicare benefits are used.
• Part A hospice care coinsurance or copayment: Plan C helps with the applicable cost-sharing for covered hospice care.
• Part A deductible: The policy covers the Part A deductible for a covered benefit period.
• Skilled nursing facility care coinsurance: Plan C helps pay the applicable Part A skilled nursing facility coinsurance, subject to Medicare's coverage rules.
• Part B coinsurance or copayment: It helps pay many of the cost-sharing amounts for Medicare-covered Part B services.
• Part B deductible: Plan C includes this benefit for people who are allowed to purchase the plan.
• First three pints of blood: It covers the first three pints used in a covered medical service when applicable.
• Foreign travel emergency care: Plan C includes limited coverage for emergency care during foreign travel, subject to the policy's limits and conditions.

These are Medigap benefits, not a promise that every service or bill will be paid. Original Medicare generally must cover the service before a supplement can pay its share, and policy limits apply. A Medigap policy also does not replace Medicare: beneficiaries need to keep Medicare Parts A and B for the supplement to work with them.

Plan C does not cover Part B excess charges. Those are amounts a provider may be permitted to bill above the Medicare-approved amount in certain circumstances. Before choosing a policy, check which providers you use and ask how Medicare and the supplement would process your claims. Medicare's official Medigap benefit comparison lays out how standardized plan letters differ.

Who can buy Plan C now?

Federal law changed which Medigap plans may cover the Medicare Part B deductible. Since January 1, 2020, a Medigap policy sold to someone newly eligible for Medicare cannot cover that deductible. As Plan C includes the Part B deductible, people who first became eligible for Medicare on or after that date generally cannot enroll in a new Plan C policy. Plan F is subject to the same broad restriction because it also covers the Part B deductible.

The restriction is tied to when a person first became eligible for Medicare, not simply the date they decide to shop. If you were eligible for Medicare before January 1, 2020, you may still be able to buy Plan C if an insurer offers it where you live and you meet the applicable enrollment requirements. Someone who already has Plan C may generally keep that policy, provided premiums are paid and the policy remains in force. Availability and enrollment rights can vary by state and by personal circumstances.

Do not assume that turning 65 is the only factor. Medicare eligibility can begin earlier for some people, and an individual's first eligibility date matters for this rule. If you are unsure when you became eligible or whether a guaranteed-issue right applies, verify your situation with Medicare, your State Health Insurance Assistance Program (SHIP), or a licensed insurance professional before applying.

When comparing options, the term “Part C” can be misleading. Medicare Advantage is also called Medicare Part C, but it is not Medigap Plan C. Medicare Advantage plans are offered by private insurers as an alternative way to receive Medicare benefits. A Medigap plan supplements Original Medicare. They are different coverage arrangements, and a person generally cannot use a Medigap policy to pay Medicare Advantage cost-sharing.

How much does Plan C cost?

There is no single national premium for Plan C. The benefits are standardized, but private insurance companies set their own premiums. Price depends on factors such as the insurer, location, age, tobacco use where permitted, and the insurer's pricing method. Some policies may use attained-age pricing, issue-age pricing, or community-rated pricing. Ask which method applies and how the premium can change over time.

The monthly premium is only one part of the comparison. Consider the amount you would pay over a year, whether the premium has changed in recent years, and which other costs remain your responsibility. Plan C does not cover every possible cost, including Part B excess charges. A lower premium can be attractive, but it should be weighed against benefits, provider billing practices, your likely use of care, and how a premium may develop as you get older.

A useful way to organize the comparison is to separate predictable costs from costs that depend on care. The premium is a predictable recurring expense, while Medicare cost-sharing depends on covered services and the rules for each benefit period. Make a simple worksheet with one column for each plan you are considering. Include the annual premium, the Part B deductible you would pay yourself if the plan does not cover it, possible copayments, and any uncovered costs that matter to you. Do not assume that a plan with a benefit for a particular expense will pay for a service Medicare does not cover.

For example, someone comparing eligible Plan C with Plan G should account for Plan C's Part B deductible benefit and Plan G's Part B excess-charge coverage. The question is not which letter sounds more comprehensive; it is how the premiums and covered cost-sharing fit the person's budget and circumstances. Plan N adds a different trade-off, including possible copayments and no coverage for Part B excess charges. Because a person's future healthcare use is uncertain, consider more than one scenario rather than basing the choice on a single expected doctor visit.

Ask the insurer for the policy's current outline of coverage and read the sections on benefit limits, exclusions, renewal, and premium changes. If you receive a quote, confirm that it is for the same plan letter and location as the other quotes you are comparing. A side-by-side review is more useful when the plan type, household information, and requested effective date match.

For an apples-to-apples review, compare Plan C policies available in your state and ask each insurer or licensed agent to confirm:

• The current premium and how it is calculated.
• Whether the policy is available to you under the January 1, 2020 eligibility rule.
• Any household discounts or other premium adjustments, if offered and applicable.
• How often premiums have changed, while recognizing past changes do not predict future prices.
• How the policy handles foreign travel emergency coverage and any relevant limits.
• What costs are not covered, including Part B excess charges.
• Whether you can change policies later and whether medical underwriting may apply.

Do not compare a Plan C premium with a different lettered plan as if the policies offered identical coverage. Start with the benefits, then compare the premium and policy terms among insurers selling the same letter in your area. Medicare's Choosing a Medigap Policy guide explains standardized plans and shopping considerations.

How does Plan C compare with Plans G and N?

The right comparison depends first on eligibility. Someone newly eligible on or after January 1, 2020 generally cannot buy Plan C, so Plans G or N may be relevant alternatives to discuss. Someone eligible before that date may compare Plan C with other policies if they are available and enrollment rules permit. The table summarizes broad benefit differences; it is not a quote or a guarantee that any plan is offered in a particular location.

Plan G covers the Part B excess charge benefit that Plan C does not, but it does not cover the Part B deductible. Plan N also leaves the Part B deductible to the beneficiary and may involve copayments for certain office or emergency-room visits; it does not cover Part B excess charges. Exact terms and remaining Medicare cost-sharing should be confirmed with current official materials and the policy documents.

If Plan C is available to you, compare its premium with Plan G or Plan N premiums and the costs each option leaves behind. In particular, do not assume Plan C will always be less expensive simply because it has fewer benefits than Plan G in one area, or that a plan with a lower premium will have the lowest total cost. Actual premiums differ among insurers and locations.

Plan letters describe benefits, not provider networks. With Original Medicare and Medigap, beneficiaries generally may see any provider that accepts Medicare, subject to Medicare rules. Still, it is sensible to ask a doctor's billing office whether the provider accepts Medicare assignment and to understand how the provider may bill Medicare. Plan C's lack of Part B excess-charge coverage can matter when a provider is allowed to bill those charges. Plan G's excess-charge benefit does not remove the need to confirm that a service is Medicare-covered or that the provider accepts Medicare.

Also distinguish a Medigap comparison from an overall Medicare coverage comparison. A Medigap policy works with Original Medicare; it does not supply a provider network or prescription drug coverage. People who choose Original Medicare often review a separate Part D plan for prescriptions. Medicare Advantage combines Medicare-covered services through the private plan and has different plan rules. These alternatives have different ways of structuring premiums, cost-sharing, provider access, and drug coverage, so compare each complete arrangement rather than one Medigap benefit in isolation.

What should you check before enrolling?

Before applying, collect the information that will shape your decision. Write down your Medicare Part A and Part B effective dates, current policy details, home ZIP code, and the doctors or facilities whose billing practices matter to you. If you already have a Medigap policy, ask whether changing it could affect guaranteed-issue rights or require medical underwriting. Rules are not identical for every situation or state.

1. Confirm eligibility. Establish when you first became eligible for Medicare and whether the Part B deductible restriction applies. Do not rely only on your current age or the date you started shopping.
2. Check local availability. Ask which insurers currently offer Plan C in your state and whether you can enroll under your circumstances. A plan letter can be standardized without being sold by every company everywhere.
3. Compare policy terms and premiums. Review the same letter across insurers, and compare the premium, pricing approach, rate history, and remaining out-of-pocket costs.
4. Look at the whole Medicare arrangement. Plan C supplements Original Medicare. If you are considering Medicare Advantage instead, compare that separate coverage choice on its own terms rather than treating it as a Medigap policy.
5. Use official and impartial help. Read Medicare's current Medigap materials and contact SHIP for free, state-based counseling. A licensed broker can explain policies they represent, but may not represent every plan available in your area.

Grey State Financial is an independent insurance brokerage, not an insurance carrier. We can help explain how Medigap plan letters and enrollment considerations work, and compare policies we represent. Brokerage assistance is provided at no charge to clients; agents are compensated by insurance carriers. Plan availability and eligibility depend on the individual and location.

We do not offer every plan available in your area. For information about all of your options, visit Medicare.gov or contact your State Health Insurance Assistance Program (SHIP).

For more background on how supplement coverage works, see our Medicare coverage overview. If you want help understanding the questions to ask, contact Grey State Financial or call (424) 348-3637.

Contact us to review your Medigap questions or call (424) 348-3637

Frequently Asked Questions

Can I buy Plan C if I turned 65 after 2019?

Turning 65 after 2019 does not by itself answer the question; the key is when you first became eligible for Medicare. People newly eligible on or after January 1, 2020 generally cannot buy a new Plan C policy because it covers the Part B deductible. Verify your individual eligibility date and state rules before applying.

Can I keep Plan C if I already have it?

In general, people who already have Plan C may keep it as long as they continue paying premiums and the policy remains in force. Contact the insurer before making a change, because replacing a policy can affect your coverage and may require underwriting.

Does Plan C cover prescription drugs or dental care?

No. Plan C is a standardized Medigap policy that helps pay certain Original Medicare cost-sharing. It does not include prescription drug coverage or routine dental coverage. People who need drug coverage typically consider a separate Part D plan when enrolled in Original Medicare, subject to applicable enrollment rules.

Is Medicare Supplement Plan C the same as Medicare Advantage Part C?

No. Medicare Advantage, also called Medicare Part C, is an alternative way to receive Medicare benefits through a private plan. Medigap Plan C is a supplement that works with Original Medicare. The names are similar, but the coverage structures are different.

Does every insurer charge the same premium for Plan C?

No. Standardization means the core benefits are alike, not that premiums are identical. Insurers set their own prices, and rates can vary by location, pricing method, age, and other permitted factors.

Plan C can be worth examining for someone who is eligible and can find it locally, but it is not available to everyone and it does not cover every possible cost. Confirm your eligibility, compare the policy details and premiums, and use current Medicare and state guidance before choosing a Medigap option.