The Short Answer
Medicare Part A is the piece of Medicare that covers inpatient care — hospital stays, skilled nursing facility care after a qualifying hospital stay, hospice care, and some home health care. Most people don’t pay a monthly premium for Part A because they or a spouse paid Medicare payroll taxes for at least 10 years while working. Instead of a premium, Part A uses deductibles and daily coinsurance tied to “benefit periods” rather than a calendar year.
In short, Part A is hospital insurance — it’s about being admitted as an inpatient, not about doctor visits or outpatient care.
What Part A Covers
- Inpatient hospital care — a semi-private room, meals, nursing care, and hospital services once you’re formally admitted.
- Skilled nursing facility care — up to 100 days per benefit period, but only after a qualifying inpatient hospital stay of at least three days.
- Hospice care — comfort-focused care for a terminal illness, including most related drugs, equipment, and support services.
- Limited home health care — skilled nursing or therapy services for those who are homebound, usually coordinated with a doctor’s plan of care.
What Part A Does Not Cover
- Doctor visits and outpatient care — those fall under Part B, even if they happen at a hospital.
- Long-term custodial care — ongoing help with daily living (bathing, dressing) with no skilled-care component isn’t covered.
- Prescription drugs you take at home — that’s the role of Part D, not Part A.
- Private-room upgrades or personal convenience items during a hospital stay, unless medically necessary.
How Part A Costs Work
- Most people pay $0 premium, since it’s earned through work history (10+ years of Medicare payroll taxes).
- A deductible applies per benefit period, not per calendar year — a new benefit period (and a new deductible) starts if you’re readmitted after being out of the hospital for 60 days in a row.
- Daily coinsurance kicks in for longer hospital or skilled nursing stays beyond a set number of days within a benefit period.
- People without enough work history can sometimes buy Part A by paying a monthly premium.
A Simple Example
Example: A Medicare beneficiary is admitted to the hospital for a 4-day stay after surgery. Because Part A has no premium for someone with a full work history, the only cost is the per-benefit-period deductible. After discharge, they need continued care and move to a skilled nursing facility — because the hospital stay met the “at least 3 days” rule, Part A covers the first 20 days of that skilled nursing care in full, with daily coinsurance starting afterward if the stay continues.
The Bottom Line
Medicare Part A is hospital insurance — inpatient stays, qualifying skilled nursing care, hospice, and limited home health — and most people get it premium-free based on work history. Its costs are structured around benefit periods rather than a calendar year, which trips people up if they’re readmitted. Understanding that Part A stops at the hospital door for everyday doctor visits is the key to seeing why Part B exists alongside it.
Frequently Asked Questions
What is Medicare Part A in simple terms?
It’s the hospital insurance part of Medicare, covering inpatient hospital stays, qualifying skilled nursing care, hospice, and limited home health care. Most people don’t pay a premium for it.
Do I have to pay a premium for Part A?
Most people don’t, because they or a spouse paid Medicare payroll taxes for at least 10 years. Those with less work history may be able to buy Part A for a monthly premium.
What is a Part A benefit period?
It starts the day you’re admitted as an inpatient and ends after you’ve been out of a hospital or skilled nursing facility for 60 straight days. A new hospital stay after that gap starts a new benefit period, with a new deductible.
Does Part A cover doctor visits?
No. Doctor visits, outpatient services, and most tests are covered by Part B, even when they happen inside a hospital. Part A is specifically about inpatient admission.
Does Part A cover a nursing home stay?
Only skilled nursing care after a qualifying hospital stay, and only for a limited number of days. Long-term custodial care — ongoing help with daily activities with no skilled-care component — is not covered by Part A.
When does Part A coverage start?
For most people, Part A starts automatically the month they turn 65 if they’re already receiving Social Security or Railroad Retirement benefits. Others need to sign up during their initial enrollment period.
This article is for educational purposes only and is not insurance, financial, tax, or legal advice. Medicare rules, costs, and coverage change over time and vary by plan and location. Visit Medicare.gov or consult a licensed insurance agent or qualified professional before making decisions about your coverage.