What Medicare does not cover that most people assume it does

What Medicare does not cover that most people assume it does

Medicare covers more than most people realize in some areas and less than most people expect in others. These seven gaps consistently catch new enrollees off guard, often at the worst possible moment.

The most expensive Medicare misunderstanding is assuming that coverage you need exists when it does not. Planning around a coverage gap you did not know about is a solvable problem when you have time. Planning around one you discover while facing a bill is a different situation entirely.

Gap 1: Routine dental care

Original Medicare covers virtually no dental care. No cleanings, no X-rays, no fillings, no crowns, no extractions, no dentures.1 There is a narrow exception for dental work that is integral to another covered procedure, such as jaw reconstruction following a covered injury, but this applies rarely and does not cover routine care.

This is the most commonly reported coverage surprise among new Medicare enrollees, and the most expensive when it hits. A crown runs $1,000 to $1,800 out of pocket. A set of dentures runs $1,500 to $3,500. A full course of periodontal treatment can reach $4,000 to $8,000.2

How to address it: Many Medicare Advantage plans now include some dental coverage, but the benefit design varies widely. Some include cleanings and X-rays but not major work. Others include a benefit maximum of $1,000 to $2,000 that does not go far for significant care. Standalone dental insurance plans run $20 to $60 a month and cover routine care adequately. Dental discount programs (not insurance) offer reduced fees at participating dentists for $10 to $15 a month and have no annual maximums, which can be more useful for people needing major work.

Gap 2: Routine vision care and eyeglasses

Original Medicare does not cover routine eye exams or prescription eyeglasses. The exception is narrow: Medicare covers annual dilated eye exams for people with diabetes, and covers glaucoma screening once a year for high-risk patients. For everyone else, routine vision care is fully out of pocket.1

Medicare does cover one pair of eyeglasses or contact lenses following cataract surgery on a covered lens. That is the extent of vision coverage under Original Medicare.

How to address it: Standalone vision plans run $15 to $25 a month and cover routine exams and basic frames. Many Medicare Advantage plans include vision benefits, though frame allowances are often limited to $100 to $200. Costco Optical and Walmart Vision Centers provide competitive out-of-pocket pricing for those who pay directly.

Gap 3: Hearing aids

Original Medicare does not cover hearing aids or the hearing exams needed to fit them.1 Prescription hearing aids from an audiologist cost $2,000 to $7,000 per pair. The FDA created an over-the-counter hearing aid category in 2022, and OTC devices now start around $200 to $800 per pair for mild to moderate hearing loss.2

How to address it: Some Medicare Advantage plans include a hearing benefit, typically an annual allowance of $500 to $1,500 that partially offsets the cost of prescription aids. The OTC category is a legitimate option for people with mild to moderate hearing loss who are willing to self-fit or work with a pharmacy audiologist. For significant hearing loss, a prescription device fitted by an audiologist remains the standard.

Gap 4: Long-term custodial care

Original Medicare covers skilled nursing facility care for up to 100 days following a qualifying hospital stay of at least three days.1 Day 1 through day 20 are covered fully. Days 21 through 100 carry a daily copay of $209.50 in 2026. After day 100, Medicare coverage ends entirely.

Medicare does not cover custodial care: assistance with bathing, dressing, eating, toileting, and daily activities. That is what assisted living, memory care, and most nursing home stays actually provide. The distinction between skilled care (covered) and custodial care (not covered) is the single most consequential coverage gap in the program for most beneficiaries.1

How to address it: Long-term care insurance, hybrid life/LTC products, Medicaid after spend-down, or self-funding. Each of these is a separate planning conversation with significant lead time requirements. The window to buy long-term care insurance at reasonable premiums is roughly 55 to 64 years old.

Gap 5: Medical care outside the United States

Original Medicare provides almost no coverage for medical care received outside the United States. Emergency care on a U.S.-flagged cruise ship within U.S. territorial waters has limited coverage. A hospital admission in another country is essentially entirely out of pocket.1

How to address it: Several Medigap supplemental plans address this gap. Plans C, D, F, G, M, and N cover 80 percent of medically necessary emergency care abroad after a $250 deductible, up to a $50,000 lifetime maximum. For extended international travel or travel to regions where emergency care costs are high, a standalone travel medical insurance policy provides more robust coverage and no lifetime cap.

Gap 6: Most alternative and complementary care

Medicare covers acupuncture for chronic low back pain up to 20 sessions per year when provided by a Medicare-enrolled practitioner.1 That is the extent of alternative care coverage. Chiropractic care is covered but only for active spinal manipulation treatment for a subluxation, and only the manipulation itself. The exam, X-rays, and any maintenance care are not covered.

Naturopathic care, massage therapy, nutritional counseling (except in limited diabetes and kidney disease contexts), and most other complementary modalities are not covered. How to address it: Medicare Advantage plans occasionally include limited benefits in these categories. Most people pay out of pocket for ongoing alternative care.

Gap 7: Cosmetic and elective procedures

Medicare covers medically necessary procedures, not elective ones. Skin lesion removal is covered if the lesion is diagnosed as potentially malignant. Removal for cosmetic reasons is not.1 The line between medical necessity and cosmetic is not always obvious. When a procedure is borderline, a physician can document the medical necessity in a way that supports coverage. This is worth asking about explicitly before proceeding with any procedure that could go either way.

A coverage gap summary

GapOriginal Medicare CoverageTypical Out-of-Pocket ExposureBest Way to Address ItDentalNone (narrow surgical exception)$1,000-$8,000+ per major episodeStandalone dental plan or MA plan with dentalVisionNone (diabetic exam and post-cataract only)$200-$600 per year for exams and glassesStandalone vision plan or MA vision benefitHearing aidsNone$2,000-$7,000 per pair (prescription)OTC aids, MA hearing benefit, or direct purchaseLong-term careSkilled care only, up to 100 days$5,000-$12,000+ per month indefinitelyLTC insurance, hybrid policy, or self-fundingCare abroadAlmost noneFull cost of care plus evacuationMedigap Plan G or standalone travel medical insuranceAlternative careAcupuncture (back pain only), chiro (limited)Full costOut of pocket; limited MA benefitsCosmetic/electiveNoneFull costDocument medical necessity where applicable

What to do next

Review this list against your actual health situation and anticipated needs. Dental and vision are the most common gaps and the easiest to address with low-cost supplemental plans. Long-term care is the highest-stakes gap and the one that requires the most lead time to address properly.

During Medicare's Annual Enrollment Period (October 15 through December 7), you can switch between Original Medicare and Medicare Advantage, or change your Medicare Advantage plan. Review your coverage against this gap list each year before the enrollment window closes.1

Sources

1. Centers for Medicare and Medicaid Services, Medicare & You 2026: The Official U.S. Government Medicare Handbook. medicare.gov/medicare-and-you

2. U.S. Food and Drug Administration, Over-the-Counter Hearing Aids: What You Should Know. fda.gov/medical-devices/hearing-aids/otc-hearing-aids

3. Kaiser Family Foundation, Medicare Beneficiaries' Costs for Dental, Vision, and Hearing Services. kff.org/medicare

4. AARP, What Does Medicare Cover? A plain-English overview of benefits and gaps. aarp.org/health/medicare/info-2020/medicare-coverage-basics.html