What Does Medicare cover?

If you are just beginning to wade into the incredibly complex world of Medicare, the sheer volume of information can feel overwhelming. You are likely asking yourself one fundamental, pressing question: what does Medicare actually cover?

To protect your health and your finances, you need to understand the 5 key structural options that make up the Medicare system:

• Medicare Part A: Covers inpatient hospital services.
• Medicare Part B: Covers outpatient medical services and essential supplies.
• Medicare Part C (Medicare Advantage): Offers an entirely distinct, bundled alternative to receive Part A and B benefits through private insurance companies.
• Medicare Part D: Provides necessary prescription drug coverage.
• Medigap (Medicare Supplement): Acts as private, supplemental insurance to cover the "gaps" left behind by Original Medicare (Parts A and B).

What is Covered by Medicare Part A?

Medicare Part A is the foundation of your hospital insurance. It steps in to cover the heavy financial burdens associated with inpatient hospitalization. These critical services include standard inpatient hospital care, stays in skilled nursing facilities, compassionate hospice care, and, under very specific, medically necessary circumstances, home health care. The vast majority of Americans are eligible for premium-free Part A coverage, provided they (or their spouse) have diligently paid Medicare taxes while working for at least 10 years (40 quarters).

When you require inpatient hospital care, Medicare Part A covers the essentials: your semi-private room, daily meals, general nursing care, and any drugs administered to you as part of your inpatient treatment. Crucially, these services are only covered once a doctor has officially written an order admitting you to the hospital as an inpatient.

Financially, Part A typically covers up to your first 60 days in the hospital without requiring any daily coinsurance payments, but only after you have met the substantial Part A deductible (which is $1,556 per benefit period in 2022). If your hospitalization extends beyond 60 days, you will face steep coinsurance costs ($389 per day for days 61-90). If your stay extends even further, you risk becoming responsible for up to 100% of the agonizing costs.

Care in a Skilled Nursing Facility (SNF) is covered, but only under strict conditions: you must have had a prior, "qualifying" inpatient hospital stay lasting at least 3 consecutive days. Furthermore, the care must be actively delivered or supervised by skilled nursing or therapy staff within a facility explicitly certified by Medicare. If you meet these criteria, Medicare will help cover the costs for up to the first 100 days in the SNF.

If a patient receives a terminal diagnosis, Part A provides vital coverage for hospice care. This compassionate benefit covers all necessary end-of-life services, encompassing doctors, nurses, home health aides, required medical equipment, pain relief medications, physical therapy, and critical grief counseling for both the patient and their grieving family.

What is Covered by Medicare Part B?

Medicare Part B is your daily medical insurance. It covers the crucial outpatient medical services and essential supplies you rely on to maintain your health. This encompasses routine and specialist doctor visits, emergency ambulance services, durable medical equipment, vital mental health services, and certain specialized prescription drugs (typically those administered directly in a doctor's office).

When you enroll in Medicare Part B, you are required to pay a standard monthly premium (which is $170.10 per month in 2022, though this figure can be higher depending on your reported income level). When you receive a service covered by Part B, Medicare typically pays 80% of the approved cost. You are financially responsible for the remaining 20% (your coinsurance obligation). Importantly, Medicare only begins paying its 80% share after you have met your annual Part B deductible ($233 in 2022).

In emergencies, Part B covers the high costs of ambulance transportation, including both ground and air transport to safely deliver you to the nearest equipped hospital. Generally, your use of hospital emergency room services is covered under Part B, unless the ER doctors formally admit you to the hospital as an inpatient, at which point Part A takes over the billing.

Part B also covers Durable Medical Equipment (DME) when your doctor formally prescribes it as medically necessary. This life-changing equipment includes blood sugar monitors for diabetics, crutches, patient lifts, walkers, manual and power wheelchairs, and other specialized devices designed specifically to aid those who are sick or injured.

Finally, Part B aggressively supports preventive care. In most cases, you will pay absolutely nothing for these services if you use a healthcare provider who "accepts assignment." These free preventive measures include crucial screenings for depression, cancer, HIV, diabetes, and cardiovascular issues, as well as bone mass measurements and annual flu shots.

What is Covered by Medicare Part C?

Medicare Part C, universally recognized as Medicare Advantage, is a private, "all-in-one" bundled alternative to Original Medicare. These plans are actively managed by private insurance companies that legally contract with the federal government to administer your Medicare benefits. Federal law mandates that every Medicare Advantage plan must provide, at minimum, the exact same baseline coverage as Original Medicare Part A and Part B.

Medicare Advantage plans have surged in popularity, largely because these private bundles typically integrate Part D prescription drug coverage (often called "MA-PD" plans). Furthermore, they aggressively compete by offering enticing "extra benefits" that Original Medicare firmly excludes, such as routine dental care, vision exams and glasses, hearing aids, and fitness club memberships.

However, this convenience comes with strict rules. Medicare Advantage plans typically operate within defined provider networks (like HMOs or PPOs). You may be forced to receive your care exclusively from doctors and hospitals within the plan's network; stepping outside the network often means the plan pays nothing. You may also be required to select a Primary Care Physician to actively coordinate your care, and you may need formal referrals before you are allowed to see a specialist.

In 2022, a remarkable 59% of Medicare Advantage plans that include prescription drug coverage charge $0 in additional monthly premiums (beyond your mandatory Part B premium). Despite the $0 premium, you must still budget for out-of-pocket costs when you actually use medical services, which will include network deductibles, specialized copays, and coinsurance percentages.

What is Covered by Medicare Part D?

Medicare Part D exists solely to provide your necessary prescription drug coverage. Like Part C, these plans are offered exclusively by private insurance carriers. You can purchase them as standalone policies (known as Prescription Drug Plans, or PDPs) to pair with Original Medicare, or you can receive this coverage bundled seamlessly within a Medicare Advantage plan. If you opt for a standalone PDP, you will pay an additional monthly premium to maintain the coverage.

The federal government sets a baseline standard of coverage that every single Part D plan must meet. Generally, Part D plans are designed to cover standard prescription drugs, life-saving insulin, the specific medical supplies required to inject that insulin (such as syringes, needles, and alcohol swabs), certain biologics, and specific, approved vaccines.

While CMS regulations dictate that all plans must cover at least two drugs within the most commonly prescribed therapeutic classes, the specific list of covered drugs—known as the "formulary"—varies wildly from one provider to the next. Crucially, insurers are legally allowed to alter these formularies during the calendar year, provided they adhere to Medicare's strict notification guidelines.

What is Covered by Medigap?

A Medigap policy (also known as Medicare Supplement) is a private insurance policy designed specifically to protect you from the crushing out-of-pocket costs—the deductibles, copays, and 20% coinsurance—that you are normally responsible for paying under Original Medicare. You pay a substantial monthly premium for this peace of mind.

Because its sole purpose is to fill the financial "gaps" of Original Medicare, a Medigap plan covers the exact same medical services as Part A and Part B. It does not provide any new or extra coverage. Depending on your financial resources and health predictability, a Medigap policy can be an incredibly powerful tool to permanently cap your healthcare costs, but it will never offer "extra benefits" like routine dental or vision care.

Medigap policies are sold by private insurers and can only be used in conjunction with Original Medicare. It is illegal for an insurer to sell you a Medigap policy if you are actively enrolled in a Medicare Advantage plan.

What is NOT Covered by Medicare?

As a general, unyielding rule, Medicare Part A and Part B will flatly refuse to cover anything that is not deemed clinically "medically necessary." This means Original Medicare absolutely will not pay for long-term care (LTC) in a nursing home, non-medical custodial care (like help bathing or dressing), elective cosmetic surgery, routine dental work, vision exams, hearing aids, or general wellness programs.

While Medicare Advantage (Part C) plans are legally bound to match Original Medicare's coverage, they frequently entice seniors by offering the extra benefits that Original Medicare denies, such as dental and vision care. However, you must read the fine print: even the most robust Medicare Advantage plans will generally refuse to cover massive, systemic expenses like long-term facility care or purely elective surgeries.

Furthermore, federal law explicitly forbids Part D plans from covering standard over-the-counter (OTC) drugs (though some Medicare Advantage plans offer OTC allowances as a separate perk). Part D plans are also prohibited from covering drugs utilized for weight loss or weight gain, standard vitamins, cosmetic pharmaceuticals, hair growth medications, erectile dysfunction drugs, and any medication that is already covered under Part A or Part B.

Final Words

When facing the reality of aging and healthcare, ignorance is your greatest financial enemy; you must know exactly what is—and isn't—covered. This article provides a foundational, objective breakdown of the 5 key pillars of Medicare. While this summary is a strong starting point, we emphatically recommend that you study our comprehensive, deep-dive guides on Medicare Part A, Part B, Part C, Part D, and Medigap. Only by acquiring a detailed understanding can you confidently select the coverage that will truly protect you.