Lifestyle

5 Things Medicare Doesn’t Cover That Most People Assume It Does

By Erica Coleman · May 30, 2026

Nearly 66 million Americans are enrolled in Medicare. A significant portion of them discover its most important coverage gaps only after receiving a bill they didn’t expect. Here are the five that catch people most often — and what to do about each.

1. Dental care

Original Medicare does not cover routine dental cleanings, fillings, extractions, or dentures. This is one of the most consequential gaps because dental problems that go untreated do not stay dental problems — untreated infections can spread systemically, and poor oral health is directly linked to heart disease and diabetes complications. A single dental implant can cost $3,000 to $6,000 out of pocket. Some Medicare Advantage plans offer limited dental coverage, but annual caps often range from $1,000 to $2,000, far below the cost of significant dental work.

2. Hearing aids

Original Medicare does not cover hearing aids or the hearing exams required to be fitted for them. A pair of quality hearing aids typically costs $2,000 to $7,000. The clinical consequence of untreated hearing loss extends well beyond inconvenience — research has established strong links between untreated hearing loss and accelerated cognitive decline. Many seniors delay treatment because of cost. Medicare Advantage plans increasingly offer partial coverage, but out-of-pocket costs remain substantial.

3. Vision care and eyeglasses

Original Medicare covers medically necessary eye exams for conditions like glaucoma and diabetic retinopathy — but does not cover routine vision exams, contact lenses, or corrective eyeglasses. For most seniors who wear glasses, the annual exam and updated prescription come entirely out of pocket. Some Medicare Advantage plans include limited vision coverage, but coverage varies widely and may require you to use specific in-network providers.

4. Long-term custodial care

This is the gap that can wipe out a retirement entirely. Medicare covers skilled nursing care following a qualifying hospital stay — but only for a limited time, and only for skilled medical care like wound treatment or physical therapy. It does not cover custodial care — the ongoing assistance with daily living activities like bathing, dressing, and meal preparation that most people actually need as they age. The average cost of a private room in a nursing home is $108,405 per year nationally. Medicare pays none of it once skilled care needs have been met. Long-term care insurance, a hybrid life insurance policy with long-term care benefits, or significant personal savings are the only ways to cover this cost.

5. The 20% coinsurance gap — and no out-of-pocket maximum

Original Medicare Part B covers 80% of approved outpatient services — leaving you responsible for the remaining 20%. Unlike private insurance, original Medicare has no annual out-of-pocket maximum. If you have a serious illness requiring extensive treatment, the 20% coinsurance has no ceiling. A $500,000 cancer treatment course could leave you with $100,000 in coinsurance. A Medigap supplemental policy is specifically designed to cover this gap — but requires a separate monthly premium that many beneficiaries don’t budget for in retirement.

The Medicare plan comparison tool at medicare.gov allows you to compare Medigap and Medicare Advantage options in your area. Each year’s open enrollment period, from October 15 to December 7, is the primary window to review and adjust your coverage.