Medicare is a federal health insurance program primarily for people age 65 and older. Certain younger people may also qualify because of a disability, end-stage renal disease, or amyotrophic lateral sclerosis (ALS).

Medicare helps pay for eligible healthcare services, but it does not cover every medical expense or most long-term custodial care. Understanding the parts of Medicare can help you recognize the differences between hospital coverage, outpatient medical services, prescription drug coverage, and private Medicare health plans.

The four main parts are:

• Part A: Hospital insurance.
• Part B: Medical insurance.
• Part C: Medicare Advantage plans.
• Part D: Prescription drug coverage.

Your coverage, premiums, deductibles, copayments, and provider choices depend on the Medicare options and plans you have. Review the details of your own coverage before making healthcare or enrollment decisions.

Medicare Part A is hospital insurance. For eligible beneficiaries, it helps cover certain inpatient hospital services, skilled nursing facility care under qualifying conditions, hospice care, and some home health services.

Part A does not pay for every service or every day of care. Coverage depends on Medicare's rules, medical necessity, eligibility requirements, and other conditions.

Many people qualify for premium-free Part A based on their own or a spouse's Medicare-covered work history. Others may need to pay a premium.

Before receiving care, ask the healthcare facility whether the service is covered and whether you may have deductibles or other out-of-pocket costs.

Medicare Part B is medical insurance. It helps cover eligible services from doctors and other healthcare professionals, outpatient care, certain home health services, durable medical equipment, and many preventive services.

Examples of services that may be covered include eligible physician visits, certain screenings, vaccines, and annual wellness visits. Coverage depends on the service, applicable Medicare rules, and whether the requirements are met.

Most people pay a monthly premium for Part B, and deductibles or coinsurance may also apply. Some people qualify for programs that help with Medicare costs.

If you're choosing a doctor or scheduling an appointment, confirm that the provider accepts your specific coverage and ask whether any referral, authorization, or out-of-pocket payment may apply.

Medicare Part C is also known as Medicare Advantage. These plans are offered by Medicare-approved private insurance companies and provide an alternative way to receive Medicare-covered Part A and Part B benefits.

Many Medicare Advantage plans also include prescription drug coverage. Some offer additional benefits, such as certain vision, hearing, or dental services, depending on the plan.

Medicare Advantage plans can have different premiums, copayments, provider networks, and rules for accessing services. Some require referrals or prior authorization for certain care. Your costs and choices depend on the specific plan.

Before enrolling, check that your preferred doctors, hospitals, medications, and other important services are covered under the plan's current terms.

Medicare Part D helps cover outpatient prescription medications through Medicare-approved drug plans. You can generally obtain Part D coverage through a separate prescription drug plan with Original Medicare or through a Medicare Advantage plan that includes drug coverage.

Each plan has its own list of covered medications, known as a formulary, as well as its own premiums, cost-sharing rules, and pharmacy arrangements.

Before choosing a drug plan, check your current prescriptions, dosage requirements, preferred pharmacies, and the plan's coverage rules. A plan that works well for one person may not be the best option for someone taking different medications.

Review your drug coverage whenever you have an opportunity to change plans, particularly if your medications or healthcare needs change.

The two main ways to receive Medicare coverage are Original Medicare and Medicare Advantage. Understanding their differences can help you identify which details to investigate when comparing options.

Original Medicare

Original Medicare includes Part A and Part B. You can generally use any doctor or hospital in the United States that accepts Medicare, subject to Medicare's coverage rules. You can add a separate Part D prescription drug plan and may be able to purchase Medicare Supplement Insurance (Medigap) to help pay certain out-of-pocket costs.

Original Medicare does not have an annual out-of-pocket maximum for covered Part A and Part B services unless you have additional coverage that provides one.

Medicare Advantage

Medicare Advantage plans are offered by Medicare-approved private insurers. They cover Medicare Part A and Part B benefits and often include Part D drug coverage. Plans may offer additional benefits but can have provider networks, service-area restrictions, and different cost-sharing rules.

Which option is right for you?

The answer depends on your healthcare needs, preferred doctors, prescription medications, budget, travel habits, and the specific plans available to you. Compare the plan documents carefully rather than choosing based on the monthly premium or advertised extras alone.

Medicare Supplement Insurance, often called Medigap, is private insurance that can help pay certain out-of-pocket costs associated with Original Medicare, such as eligible deductibles, copayments, and coinsurance.

Medigap is different from Medicare Advantage. It supplements Original Medicare rather than replacing it, and it generally cannot be used to pay Medicare Advantage plan cost-sharing.

Medigap policies are standardized by plan type in most states, although premiums, availability, and certain details can vary. Medigap policies generally do not cover long-term custodial care, routine vision or dental care, or most hearing aids.

Before changing coverage, understand how your current insurance works, whether you can obtain the new coverage you want, and whether you might lose rights or benefits by making a change.

When comparing Medicare coverage, look beyond the monthly premium. Consider how each option fits your current and anticipated healthcare needs.

Use this checklist when reviewing your choices:

• Doctors and hospitals: Are your preferred providers included or do they accept the coverage?
• Prescription medications: Are your current medications covered, and what will they cost?
• Total costs: Compare premiums, deductibles, copayments, coinsurance, and potential out-of-pocket expenses.
• Access to care: Check whether referrals, prior authorization, or network restrictions apply.
• Additional benefits: If dental, vision, hearing, or other benefits matter to you, verify exactly what each plan includes.
• Future changes: Understand when you can change plans and how switching could affect your coverage.

For official Medicare plan comparisons, use Medicare.gov or speak with your State Health Insurance Assistance Program (SHIP), which offers free, personalized Medicare counseling.

Village Physicians can discuss your medical care and help you understand questions to raise about your coverage. For insurance enrollment decisions, consult Medicare or a qualified Medicare counseling resource.

Here are three authoritative links to include in the Village Physicians Medicare article. All are official U.S. government resources.

1. Medicare.gov — Parts of Medicare  — Explains Parts A, B, C, and D, Original Medicare, Medicare Advantage, and Medigap.
2. Medicare.gov — Medicare Basics  — Covers how Medicare works, general costs, enrollment, and coverage options.
3. CMS — Medicare Supplement Insurance (Medigap)  — Explains how supplemental insurance works with Original Medicare and helps cover certain out-of-pocket costs.