Medicare Explained: Coverage Options and Enrollment Guide

Medicare provides health insurance coverage to over 67 million Americans, primarily those aged 65 and older, along with younger individuals with qualifying disabilities and people with End-Stage Renal Disease. As the federal government's largest health insurance program, Medicare plays a central role in healthcare for older Americans.

Choosing the right Medicare coverage requires understanding the different parts of Medicare, what each covers, and how they work together. Making informed decisions during enrollment can save thousands of dollars annually while ensuring comprehensive health coverage.

What Does Medicare Part A Cover?

Medicare Part A covers inpatient hospital stays, skilled nursing facility care following a hospital stay, home health services, and hospice care. Most people do not pay a monthly premium for Part A if they or their spouse paid Medicare taxes for at least 40 quarters during their working years.

Part A includes a deductible of $1,676 per benefit period in 2026. After the deductible, Part A covers the first 60 days of hospitalization fully, with daily coinsurance of $419 for days 61 through 90. Lifetime reserve days provide an additional 60 days of coverage with higher coinsurance throughout your lifetime.

What Services Does Medicare Part B Include?

Medicare Part B covers outpatient medical services including doctor visits, preventive care, diagnostic tests, lab work, outpatient surgery, durable medical equipment, mental health services, and ambulance transportation. Part B also covers many preventive screenings and vaccines at no cost to beneficiaries.

The standard Part B premium is $185 per month in 2026, with higher-income beneficiaries paying surcharges through the Income-Related Monthly Adjustment Amount. After meeting the annual deductible of $257, Part B covers 80% of approved services with the beneficiary responsible for the remaining 20% coinsurance.

How Does Medicare Part C Work?

Medicare Advantage plans, also called Part C, are offered by private insurance companies approved by Medicare. These plans bundle Part A and Part B coverage and usually include prescription drug coverage. Many plans offer additional benefits like dental, vision, hearing, fitness programs, and transportation to medical appointments.

Medicare Advantage plans use provider networks such as HMOs, PPOs, or PFFS arrangements. Monthly premiums vary by plan and may be $0 beyond your Part B premium. Plans must cover everything Original Medicare covers but may use different cost-sharing structures. Compare plans annually as benefits and networks change each year.

What Is Medicare Part D Prescription Drug Coverage?

Part D provides outpatient prescription drug coverage through private insurance plans. Standalone Part D plans pair with Original Medicare, while Medicare Advantage plans typically include integrated drug coverage. Average monthly premiums for standalone Part D plans are approximately $40 in 2026.

Part D plans use formularies that organize covered drugs into tiers with different cost-sharing amounts. Generic drugs occupy lower tiers with minimal copays while brand-name and specialty medications appear on higher tiers with greater out-of-pocket costs. The Inflation Reduction Act capped annual out-of-pocket drug spending at $2,000 starting in 2025.

When Should You Enroll in Medicare?

Your Initial Enrollment Period begins three months before your 65th birthday month, includes your birthday month, and extends three months after. Enrolling during this seven-month window ensures coverage starts as early as possible and avoids late enrollment penalties that permanently increase your premiums.

If you have employer coverage when you turn 65, you may delay Medicare enrollment without penalty. A Special Enrollment Period begins when employer coverage ends, giving you eight months to sign up for Part B. Missing enrollment deadlines can result in a 10% Part B premium penalty for each 12-month period you were eligible but not enrolled.

What Is Medicare Open Enrollment?

The Annual Enrollment Period runs from October 15 through December 7 each year. During this window, you can switch from Original Medicare to Medicare Advantage, change Medicare Advantage plans, switch from Medicare Advantage to Original Medicare, or join, switch, or drop a Part D plan. Changes take effect January 1.

Review your coverage annually during open enrollment even if you are satisfied with your current plan. Plan benefits, formularies, provider networks, and premiums change every year. Your medications and healthcare needs may also change, making a different plan more cost-effective.

Do You Need a Medicare Supplement Plan?

Medigap plans sold by private insurers help cover cost-sharing gaps in Original Medicare including deductibles, coinsurance, and copayments. Medigap plans are standardized by letter designation, with Plan G and Plan N being the most popular choices. Medigap plans do not work with Medicare Advantage.

The best time to buy Medigap is during your six-month open enrollment period starting the month you turn 65 and are enrolled in Part B. During this window, insurers cannot deny coverage or charge more based on health conditions. After this period, medical underwriting may apply and coverage can be denied.

How Much Does Medicare Cost?

Total Medicare costs depend on which parts you enroll in, your income level, and whether you choose Original Medicare with Medigap or Medicare Advantage. Typical monthly costs for Original Medicare with Part D and Medigap Plan G range from $300 to $500 depending on your location and income bracket.

Medicare Advantage plans may reduce monthly premiums but introduce network restrictions and per-service copays. Annual out-of-pocket maximums for Medicare Advantage plans are capped at $8,850 for in-network services in 2026. Compare total projected costs including premiums, deductibles, and expected utilization when choosing coverage.

What Preventive Services Does Medicare Cover for Free?

Medicare covers an annual wellness visit, cardiovascular disease screening, diabetes screening, mammograms, colonoscopies, flu shots, pneumonia vaccines, COVID-19 vaccines, depression screening, and many other preventive services at no cost when provided by participating providers.

The Welcome to Medicare preventive visit is available within the first 12 months of Part B enrollment. Take advantage of these no-cost screenings to detect health conditions early. Discuss recommended preventive services with your doctor to create a personalized prevention schedule.

Does Medicare Cover Dental and Vision?

Original Medicare provides very limited dental and vision coverage, typically only covering dental services needed as part of a covered procedure and eye exams related to diagnoses like glaucoma or diabetes. Routine dental cleanings, eyeglasses, and hearing aids are not covered under Original Medicare.

Many Medicare Advantage plans include dental, vision, and hearing benefits as supplemental coverage. Standalone dental and vision insurance plans are also available for purchase. Compare the cost of supplemental coverage against expected usage to determine whether additional plans provide good value for your situation.

How Does Medicare Handle Mental Health Services?

Medicare covers outpatient mental health services including individual and group therapy, psychiatric evaluation, medication management, and partial hospitalization programs. Part B covers 80% of approved mental health services after the annual deductible. Inpatient psychiatric care is covered under Part A with a 190-day lifetime limit.

Telehealth mental health services expanded significantly and many accommodations continue in 2026. Medicare beneficiaries can access therapy and psychiatric appointments virtually from home. The Mental Health Parity requirements ensure that mental health coverage is comparable to medical and surgical coverage within Medicare plans.

What Help Is Available for Medicare Costs?

Medicare Savings Programs help low-income beneficiaries pay Part B premiums, deductibles, and coinsurance. The Extra Help program assists with Part D prescription drug costs, covering premiums, deductibles, and copays for eligible beneficiaries. Combined, these programs save qualifying individuals thousands of dollars annually.

State Health Insurance Assistance Programs provide free, unbiased Medicare counseling in every state. SHIP counselors help compare plans, understand coverage options, resolve billing issues, and apply for assistance programs. Contact your state SHIP by calling 1-877-839-2675 or visiting shiphelp.org.