Plan in action

What Medicare doesn't cover, the gaps worth knowing

6 min read

Medicare is a strong foundation. It covers hospital stays, doctor visits, tests, prescription drugs. But not everything. A lot of people enroll in the program and only discover, after the first dentist visit or first pair of glasses, that they have to pay out of pocket. Better to know in advance. This guide covers the biggest gaps in Original Medicare and how families typically close them.

A quick note on what Medicare does cover

Federal Original Medicare has two parts. Part A (hospital) and Part B (doctor visits and outpatient care). Your parent can also add Part D (a prescription-drug plan) or switch to Medicare Advantage (Part C), a single private package that bundles A, B, and usually D together through an insurance company.

Everything below describes gaps in Original Medicare. Medicare Advantage plans often add some of these benefits as extras, but those extras are set by the plan, not by federal law. Two different things, and easy to mix up.

1. Dental, vision, hearing aids

These three are the most common questions we hear in the office. The short answer: Original Medicare doesn't cover routine dental, vision, or hearing aids. Coverage kicks in only in medical situations. For example, an eye injury treated in the ER, or a dental procedure that's part of a larger hospital surgery.

In practice, this means your parent pays out of pocket for cleanings, fillings, crowns, dentures, eye exams, glasses, hearing aids. For most people, this is the biggest surprise after moving to Medicare. We cover the topic in depth in a separate guide: Does Medicare cover dental?

2. Long-term care (custodial care)

Here's a gap that surprises even families who think they know the system. Medicare covers short-term stays in a skilled nursing facility, but only after a hospitalization, only for a limited time, and only if the patient genuinely needs rehab or skilled nursing care.

Medicare does not cover long-term care for someone who just needs help with daily activities. Bathing, eating, dressing, getting around. That's called custodial care. Nursing-home stays, 24/7 in-home care, a personal aide, your parent pays for all of it themselves, or through Medicaid (if they qualify), or through a separate long-term care insurance policy.

This is the single largest financial gap in Medicare, and it's worth discussing as a family in advance, not in the moment a decision becomes urgent.

3. Care outside the United States

Original Medicare almost never covers care outside the U.S. The exceptions are narrow. For instance, when a Canadian or Mexican hospital is closer than any American one. For your parent if they travel to Poland for summer or holidays, this means one thing. Buy a separate travel insurance policy for the trip.

Some Medigap (Medicare Supplement) policies and some Medicare Advantage plans offer limited foreign coverage, but the details depend on the specific plan and there's a dollar cap. Don't assume the Medicare card alone will work in Kraków or Cancún.

4. Over-the-counter drugs and most alternative medicine

Part D covers prescription drugs that are on the plan's formulary. It does not cover:

• over-the-counter vitamins and supplements,
• drugs used for cosmetic purposes,
• fertility drugs,
• weight-loss drugs (rules are shifting here, worth checking),
• acupuncture, with narrow exceptions,
• chiropractic care, beyond specific spinal manipulations,
• therapeutic massage.

5. Private rooms, TV, hospital comforts

Part A covers a hospital stay at the standard level. Shared room, basic meals, basic care. A private room, a TV, a phone, extra hotel-like amenities, those are an upgrade your parent pays for themselves, unless a private room is medically necessary (rare).

6. Routine foot care (with exceptions)

Routine foot care, trimming nails, removing calluses, treating cracks, is not covered. The exception is for people with diabetes or other conditions where the feet need medical monitoring. That coverage exists, but only for specific diagnoses.

How families close these gaps

Four common paths:

A Medicare Advantage plan with extra benefits

Many Medicare Advantage plans add benefits Original Medicare doesn't have, like dental, vision, an OTC card, transportation. The scope is set by the plan, not by federal law, so it can change year to year. Details in our Medicare Advantage guide.

Medicare Supplement (Medigap)

These policies close the gaps within Original Medicare itself, the deductible, the copay, the coinsurance, but they don't add new benefits like dental. More in our Medigap guide.

Standalone dental, vision, hearing (DVH) plans

Separate insurance policies, purchased independently from Medicare. They work like the small dental packages from the employer world. We cover them in more detail in the dental guide.

Indemnity (cash-benefit) plans

Policies that pay a fixed cash amount when a specific event happens. A hospital stay, a cancer diagnosis, an accident. The money goes to your parent, not the hospital. When they make sense, and when they don't, in our guide on indemnity plans.

Each path makes sense for a different person. There's no single right answer. It depends on your parent's health, budget, family situation, and what they actually use most often.

What to do

1. Write down what your parent actually uses over a year. Dental visits, glasses, hearing aids, physical therapy.
2. Check whether their current plan (if they already have one) covers those things. The detail is in the plan document, in the Evidence of Coverage section.
3. Add up what your parent paid out of pocket last year for things Medicare didn't cover.
4. Only then decide whether closing the gap with extra coverage makes sense, and if so, which kind.