How Medicare works for aging parents What caregivers actually need to know

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Medicare has four parts. Part A covers hospital stays, Part B covers doctor visits and outpatient care, Part C is the private Medicare Advantage alternative, and Part D covers prescriptions. None of the four pays for long-term custodial care.

Most adult children know a parent "has Medicare" without knowing what that actually pays for, until a hospital bill or a discharge planner forces the question. Medicare.gov's own summary is short: Part A "helps cover inpatient care in hospitals, skilled nursing facility care, hospice care, and home health care." Part B covers "services from doctors and other health care providers," outpatient care, and durable medical equipment. Part C is a private, Medicare-approved alternative that "bundles" the two together. Part D covers drug costs. What all four share is a medical test. Help with the ordinary tasks of daily living sits outside that test entirely, and that single line is what reshapes how most families end up paying for care.

What Medicare's four parts actually cover

Each part covers a different category of care, and the boundary between them is where most confusion starts.

Part A pays for the hospital, not the bedroom

Part A covers inpatient hospital stays, skilled nursing facility care after a qualifying hospital stay, hospice, and some home health care. Most people pay no monthly premium for Part A, because they or a spouse paid Medicare taxes for "generally at least 10 years". A parent without that work history pays $311 or $565 a month for Part A in 2026, depending on how long they worked and paid in.

Premium-free does not mean cost-free. The 2026 Part A inpatient hospital deductible is $1,736 per benefit period, and a benefit period can recur more than once in a year if a parent is readmitted after a long enough gap. Hospital stays that run past 60 days add daily coinsurance, reaching $868 a day in 2026. Most people draw on those lifetime reserve days only once, in one serious illness.

Skilled nursing facility coverage under Part A runs on its own clock, after at least three days as an admitted inpatient:

• Days 1-20: Medicare pays the full cost. A parent owes nothing.
• Days 21-100: Medicare pays a portion; a parent owes $217 a day in 2026. Some Medigap plans cover this coinsurance.
• Day 101 and beyond: Medicare pays nothing. The cost falls to the family, long-term care insurance, or Medicaid.

Coverage can end well before day 100 if a facility decides skilled care is no longer medically necessary, which happens more often than a family reaching the 100-day limit. Our guide to skilled nursing care versus nursing home care walks through how that decision gets made.

Part B pays for the doctor, and carries a monthly bill

Part B is the part that runs every month, whether or not a parent sees a doctor. It covers visits, outpatient surgery, lab work, imaging, outpatient therapy, mental health services, and durable medical equipment such as walkers, hospital beds, and oxygen.

The standard Part B premium is $202.90 a month in 2026, up $17.90 from 2025, and the annual deductible is $283. After the deductible, a beneficiary pays 20% of the Medicare-approved cost for most covered services, and Original Medicare carries no yearly out-of-pocket limit on that 20%. A single complicated year, several specialists, a course of chemotherapy, can turn that uncapped share into real money, which is the gap the Medigap section below exists to close.

Part C trades some flexibility for a bundled plan

Medicare Advantage is a delivery method, not extra coverage on top of Parts A and B. A private insurer, approved by Medicare, "bundles" Part A, Part B, and usually Part D into one plan and takes over paying the claims. Most Medicare Advantage plans add benefits original Medicare does not cover, commonly dental, vision, or hearing.

The trade is the network. Medicare.gov's own description is direct: a beneficiary "may need to use doctors in the plan's network and get approval for certain drugs or services before you get them." For a parent whose care is local and straightforward, that can work well and cost less. A parent seeing specialists in more than one place, or likely to be hospitalized more than once, is usually better served by original Medicare paired with a Medigap policy, because it is accepted almost anywhere that takes Medicare at all.

Part D covers drugs, and penalizes waiting

Part D is sold through private insurers approved by Medicare. A parent on original Medicare enrolls in a standalone Part D plan; a parent on Medicare Advantage usually gets drug coverage as part of that plan already. Each plan has a formulary, the list of covered drugs and their cost tier. Medicare's Plan Finder tool at Medicare.gov lets a family enter current medications and compare plans on total annual cost before choosing.

Skipping Part D because a parent currently takes nothing is a common and expensive mistake. Going 63 or more days without Part D or other creditable drug coverage triggers a late enrollment penalty of 1% of that year's national base beneficiary premium for every uncovered month, added to the monthly premium for as long as the parent has Part D coverage, permanently. The national base beneficiary premium is $38.99 in 2026. Medicare.gov's own worked example puts a 14-month gap at roughly $5.50 extra a month, rounded to the nearest ten cents.

The gap that catches most families

Medicare.gov states it without qualification: "Medicare doesn't pay for long-term care" and "you pay all costs." The same page defines long-term care, also called custodial care, as help with the ordinary activities of daily living: dressing, bathing, using the bathroom, along with supervision, meal preparation, and medication reminders for someone who cannot safely manage them alone.

The exclusion does not bend for severity or location. A parent with advanced dementia who cannot dress, bathe, or feed herself, living inside a nursing home, is not covered by Medicare for any of that help. That is true even in the same building that previously provided a covered skilled stay, because the help is custodial, not skilled, under Medicare's own definition, and the building she is in does not change which one it is.

Long-term custodial care gets paid one of four ways: savings and family contributions; a long-term care insurance policy bought years earlier; Medicaid, once assets are spent down to the state's limit; or some combination of the three. Our guides on paying for assisted living and how Medicaid pays for long-term care cover the second and third paths in detail.

Medigap closes the 20% original Medicare leaves open

Medigap, also called Medicare Supplement Insurance, is private insurance built to cover the deductibles and uncapped 20% coinsurance that original Medicare leaves a family holding. It does nothing for custodial care; its whole job is the cost-sharing gap inside Parts A and B.

Medigap plans are standardized by letter, so a Plan G from one insurer covers the same benefits as a Plan G from any other, and families can compare mainly on price. Plan G is, per the Kaiser Family Foundation, "the most popular and comprehensive plan available to new enrollees." It covers most of what original Medicare does not, including the Part A hospital deductible and the SNF coinsurance on days 21 through 100. KFF found the average Plan G premium among current policyholders was $164 a month in 2023, the most recent figure it has published. A family pricing a policy today should treat that as a floor, not a current quote, and get an actual rate from the state insurance department's own comparison tool.

Timing decides whether a parent gets that price at all. Medicare.gov is explicit about the window: it lasts six months after Part B starts, at 65 or older. During it, "you can buy any Medigap policy sold in your state, even if you have health problems." Once that window closes, the same page says a parent "might not be able to buy a Medigap policy" at all, or "it may cost more." Long-Term Care Insurance is a related but separate product, covering the custodial gap Medigap does not touch. It is its own decision with its own timing; our guide on long-term care insurance covers that ground.

Two different windows govern changing coverage

Once enrolled, a parent's chances to change Part C and Part D choices are not open year-round. Medicare's Open Enrollment Period runs October 15 through December 7 every year; changes take effect January 1. During it, a parent can switch between original Medicare and Medicare Advantage, change Medicare Advantage plans, or change Part D plans.

A second, narrower window follows it. The Medicare Advantage Open Enrollment Period runs January 1 through March 31, but only for someone already enrolled in a Medicare Advantage plan. It allows one change: switching to a different Medicare Advantage plan, or dropping it to return to original Medicare with a separate Part D plan. It does not let anyone move from original Medicare into Medicare Advantage.

Outside both windows, a change generally needs a Special Enrollment Period. One assumption is worth checking in advance: losing a job does not, by itself, open one. Medicare.gov lists the triggers that do. Leaving employer or union coverage opens a two-month window after the coverage ends. Moving outside a plan's service area opens a two-month window from the move. Moving into, or recently out of, a nursing home or rehabilitation hospital opens a window that lasts as long as the stay and for two months after; losing Medicaid eligibility opens a three-month window from whichever is later, the loss of eligibility or the notice of it.

A higher income means a higher premium

Most beneficiaries pay the standard $202.90 Part B premium. Above certain income levels, Medicare adds an Income-Related Monthly Adjustment Amount, IRMAA, to both Part B and Part D. Per the CMS 2026 fact sheet, IRMAA starts above $109,000 in modified adjusted gross income for an individual, or $218,000 filing jointly. It rises in five tiers from there, reaching a top Part B premium of $689.90 a month at $500,000 or more in individual income, plus a Part D surcharge of up to $91.00.

The income used is two years old, so 2026 premiums are set from 2024 tax returns. That lag matters for caregivers. A parent who sold a home, took a large retirement distribution, or had a one-time capital gain two years ago can pay a surcharge on income they no longer have. The Social Security Administration allows an appeal through Form SSA-44 when a documented life-changing event, among them marriage, divorce, the death of a spouse, or a loss of income, has since lowered the household's income.

Six things worth an hour this month

Most of the following take less than an hour each and head off a problem that otherwise surfaces during a crisis, when there is no time to fix it.

• Find the Medicare card and record the Medicare Beneficiary Identifier. Every provider interaction needs it.
• Set up a MyMedicare.gov account. It gives online access to Medicare Summary Notices, coverage details, and a medication history.
• File CMS-10106. Filing the 1-800-Medicare Authorization to Disclose Personal Health Information form lets 1-800-MEDICARE discuss your parent's account with you. It is separate from healthcare power of attorney, which covers medical decisions, not phone access to Medicare's own records.
• Confirm every doctor still takes the plan. Most physicians take original Medicare; for a parent on Medicare Advantage, confirm each doctor is still in-network, since out-of-network costs there can be substantial.
• Re-run the drug plan every fall. Formularies and premiums change every year. During the October 15 to December 7 window, run current medications through Medicare's Plan Finder to see whether the existing plan is still the cheapest option.
• Track the Medigap window if a parent is approaching 65. The six-month guaranteed-issue period after Part B starts is, for most families, the single most consequential piece of Medicare timing they will manage.

The Centers for Medicare and Medicaid Services and Medicare.gov publish every figure above and update them each fall for the coming year. A family checking any dollar amount here against a Medicare Summary Notice or a plan quote should expect the current-year number, not this one. New figures release every fall.