Medicare and Healthcare Costs in Retirement: What You Need to Plan For

The Four Parts of Medicare

Medicare is divided into four parts, each covering different services. Understanding what each part covers — and what it costs — is the foundation of retirement healthcare planning.

Part A: Hospital Insurance

Part A covers inpatient hospital stays, skilled nursing facility care (after a qualifying hospital stay), hospice care, and some home health services. Most people pay no premium for Part A if they or their spouse worked and paid Medicare taxes for at least 10 years. It is automatically available at 65 for most people.

What it doesn’t cover: there is a deductible for each hospital benefit period ($1,632 in 2024), and costs increase for extended hospital stays. Long-term nursing home care is not covered beyond 100 days.

Part B: Medical Insurance

Part B covers outpatient medical services: doctor visits, preventive care, lab tests, durable medical equipment, and outpatient procedures. The standard Part B premium is $174.70/month in 2024, though higher earners pay more through Income-Related Monthly Adjustment Amounts (IRMAA). Part B has a $240/year deductible, after which Medicare covers 80% of covered services — leaving you responsible for the remaining 20% with no out-of-pocket cap.

Part C: Medicare Advantage

Medicare Advantage plans are offered by private insurers approved by Medicare. They bundle Parts A and B (and usually Part D) into a single plan, often with lower premiums and added benefits like dental, vision, and gym memberships. The tradeoff: you use a network of providers, and prior authorizations are more common. Plans vary significantly by geography — coverage available in Tuscaloosa may differ from urban markets.

Part D: Prescription Drug Coverage

Part D covers prescription drugs. It is offered through private insurers approved by Medicare, and premiums, formularies, and cost-sharing vary by plan. If you don’t enroll when first eligible and don’t have other qualifying drug coverage, you’ll pay a permanent late-enrollment penalty for every month you went without coverage.

Medigap: Filling the Gaps in Original Medicare

Medigap (also called Medicare Supplement Insurance) policies pay for costs that original Medicare doesn’t — deductibles, copays, and the 20% coinsurance that Part B leaves uncovered. The most popular plans (Plan G and Plan N) can significantly cap your out-of-pocket exposure in exchange for a monthly premium typically ranging from $100–$250/month depending on your age and location.

The key timing rule: if you enroll in Medigap during your 6-month Medigap Open Enrollment Period (which starts when you’re 65 and enrolled in Part B), insurers cannot deny you coverage or charge more based on health conditions. Enroll outside this window and you can be medically underwritten or denied. Waiting has real consequences.

When to Enroll — and What Happens If You Wait

Medicare enrollment timing is one of the most consequential decisions in retirement planning. Miss the window and you pay permanent penalties.

• Initial Enrollment Period: 7-month window beginning 3 months before you turn 65, your birth month, and 3 months after. Enroll in both Part A and Part B during this window.
• Special Enrollment Period: If you’re still working at 65 and covered by employer insurance, you can delay without penalty — but you must enroll within 8 months of leaving employer coverage.
• Late enrollment penalty (Part B): 10% added to your premium for every 12-month period you could have enrolled but didn’t. This penalty is permanent and applies for as long as you have Part B.
• Late enrollment penalty (Part D): 1% of the national base beneficiary premium for each month without coverage. Also permanent.

IRMAA: When Higher Income Means Higher Premiums

If your income exceeds certain thresholds, Medicare charges higher Part B and Part D premiums. These are called Income-Related Monthly Adjustment Amounts (IRMAA). In 2024, IRMAA surcharges begin at $206,000 MAGI for married filers ($103,000 for single). The surcharges are based on your income from two years prior — so your 2026 premiums are based on your 2024 tax return.

This matters for retirement planning because large Roth conversions, asset sales, or RMDs can temporarily push your income above the threshold, triggering higher Medicare premiums. This is another reason to model income carefully in the years surrounding retirement transitions.

Healthcare Costs as a Planning Number

Rather than treating healthcare as a vague uncertainty, build it into your retirement budget. A reasonable framework for planning:

• Budget $500–$700/month per person for combined Medicare premiums, Medigap, and Part D (varies by age and plan choices)
• Add a reserve for out-of-pocket expenses not covered by supplements (dental, vision, hearing — original Medicare covers almost none of these)
• Plan for long-term care separately — Medicare does not cover custodial nursing home care beyond 100 days

An HSA funded during your working years is one of the best tools for paying healthcare costs in retirement tax-free. Funds roll over indefinitely, and after 65 you can withdraw for any purpose (though non-medical withdrawals become taxable income, like a traditional IRA).

Long-Term Care: The Coverage Gap Most People Ignore

Neither Medicare nor most private health insurance covers extended custodial care — help with bathing, dressing, eating, or supervision due to cognitive decline. The average nursing home in Alabama costs $6,000–$8,000 per month. Long-term care insurance, hybrid life/LTC policies, or a dedicated self-funded reserve are the main options. This is worth evaluating in your late 50s or early 60s — premiums are significantly higher if you wait until your 70s, and coverage can be denied based on health.