Medicare Coverage Gaps: What Social Security Doesn’t Pay For

As senior benefits specialists, we’ve seen too many retirees shocked by medical bills Medicare doesn’t cover. Here’s what you need to know — and what options exist to close those gaps.

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Information portal · Not insurance or medical advice · Regulated by CMS (Centers for Medicare & Medicaid Services)

What Medicare Covers — and What It Doesn’t

Medicare is the federal health insurance program for Americans 65 and older, administered by the Centers for Medicare & Medicaid Services (CMS). It has four parts — and each covers different services with different cost-sharing rules.

Medicare Part A covers hospital stays, skilled nursing facility care, and some home health services. Part B covers outpatient care, doctor visits, and preventive services. Together, they form “Original Medicare” — but they leave significant gaps.

Original Medicare does not cap your out-of-pocket costs. There’s no annual limit on what you could pay for covered services — which is why Medicare supplement plans (also called Medigap) were created by the federal government.

Medicare Supplement Plans: Filling the Gaps

Medicare supplement plans — regulated by CMS and sold by private insurers — help pay for costs that Original Medicare doesn’t cover. These include deductibles, copayments, and coinsurance.

There are 10 standardized Medigap plan types (A, B, C, D, F, G, K, L, M, N). Each offers a different level of coverage at different premium levels. Plan G is currently the most comprehensive option available to new enrollees since Plan F was phased out.

With a Medicare supplement plan, you can generally see any doctor or specialist in the U.S. who accepts Medicare — without referrals or network restrictions. This flexibility is a key advantage over Medicare Advantage plans.

Medicare Advantage Plans: An Alternative Approach

Medicare Advantage plans (Part C) are an alternative way to receive your Medicare benefits through a private insurer approved by CMS. These plans often include additional benefits not covered by Original Medicare — such as dental, vision, hearing, and fitness programs.

Medicare Advantage plans typically have lower monthly premiums than Medigap plans, but they use provider networks. You may need referrals and may be limited to in-network doctors and hospitals — especially for non-emergency care.

Unlike Medicare supplement plans, Medicare Advantage plans cap your annual out-of-pocket costs — which can provide predictability for budgeting alongside your Social Security income.

Medigap vs. Medicare Advantage: Key Differences

Feature	Medicare Supplement (Medigap)	Medicare Advantage
Provider network	Any Medicare doctor	In-network required
Monthly premium	Higher	Often lower/zero
Out-of-pocket cap	None (plan pays gaps)	Annual cap applies
Extra benefits	No	Dental, vision, hearing
Drug coverage	Needs separate Part D	Often included
Referrals needed	No	Often yes (HMO)
Regulated by	CMS + State	CMS

Source: Centers for Medicare & Medicaid Services (CMS) | medicare.gov | All information is general and for educational purposes only.

⚖ What If You’re Disabled and Can’t Work?

Social Security Disability Insurance (SSDI) is a separate benefit — and millions of eligible Americans are denied on their first application. A Social Security disability attorney can make a critical difference in the outcome of your claim.

Next, we explain SSDI eligibility, how the application process works, and when hiring a disability lawyer makes financial sense.

→ SSDI Rights & Disability Benefits

Frequently Asked Questions

Do I need Medicare supplement plans if I have Social Security?

Social Security provides income, not health coverage. Medicare is separate. Even with Medicare Parts A and B, you face deductibles, copays, and no out-of-pocket limit. Medicare supplement plans help cover these costs — they are not the same as Social Security.

When can I enroll in Medicare?

You can enroll in Medicare starting 3 months before your 65th birthday. Your Initial Enrollment Period lasts 7 months total. Missing this window can result in permanent late enrollment penalties on your monthly premium.

What is senior health insurance beyond Medicare?

Senior health insurance beyond Medicare includes Medigap policies, Medicare Advantage plans, standalone Part D drug plans, and supplemental products like dental, vision, and hearing coverage. These are all regulated by CMS and state insurance departments.

Can I have both Medicare Advantage and a Medigap plan?

No. You cannot use a Medicare supplement plan alongside Medicare Advantage. They are mutually exclusive. If you enroll in Medicare Advantage, your Medigap policy can be suspended or terminated depending on state rules.

How much do Medicare supplement plans cost per month?

Monthly premiums for Medigap plans vary by plan type, insurer, age, gender, and location. In 2026, Plan G premiums typically range from $80 to $300+ per month. Costs increase with age. Comparison tools are available at medicare.gov.

Disclaimer: This content is for general informational and educational purposes only. It does not constitute insurance, medical, financial, or legal advice. Medicare plans are regulated by the Centers for Medicare & Medicaid Services (CMS). Always consult Medicare.gov or a licensed insurance professional for personalized guidance. Last updated: May 2026.