What Is Original Medicare?
Health insurance in retirement can be one of the most confusing parts of turning 65. There’s a good chance you’ve heard the term “Medicare” tossed around – maybe from a TV commercial, a letter in the mail, or a well-meaning friend or family member offering advice.
But figuring out exactly what it covers, how to sign up, what it costs, and whether you need anything else can feel overwhelming.
The good news? You’re not alone – and this guide is here to help.
This post focuses on Original Medicare, the core of the Medicare program that millions of Americans rely on for their health coverage. Whether you’re approaching eligibility, helping a parent or spouse through the process, or simply wanting to better understand your options, we’ll break everything down into manageable pieces.
You’ll learn:
- What Original Medicare includes
- How much it costs
- What it doesn’t cover
- How you can fill the coverage gaps
We’ll also walk through enrollment timelines, eligibility rules, and some common questions that trip people up along the way.
Our goal is to make Medicare clear, so you can make confident decisions about your healthcare without needing a dictionary or a degree in insurance.
Let’s start with the basics: what exactly is Original Medicare, and how does it work?
If you're approaching age 65, you've probably heard plenty about Medicare — but understanding what Original Medicare actually covers is where many people get confused. This guide explains exactly how Original Medicare works, what it costs, what's not covered, and what your options are for filling those gaps.
If you're ready to look at how to fill those gaps, we'll point you to dedicated guides on Medigap, Part D, and Medicare Advantage along the way.
How Original Medicare Works
Original Medicare is the traditional federal health insurance program, running since 1966. It now covers over 66 million Americans — seniors, plus younger people with qualifying disabilities or serious illnesses.
It has two parts:
- Part A — hospital insurance
- Part B — medical insurance
Unlike Medicare Advantage, Original Medicare is run directly by the federal government rather than a private insurance company.
Together they cover a wide range of care. What makes Original Medicare different from a private plan is flexibility: you can see any doctor or hospital in the country that accepts Medicare. No networks, no referrals.
Leaves deductibles, coinsurance, and other coverage gaps
What Medicare Part A Covers
Part A covers care in a hospital or skilled nursing facility, plus limited hospice and home health services.
- Inpatient hospital stays (room, meals, nursing care, medications)
- Skilled nursing facility care (after a 3-day qualifying hospital stay)
- Hospice care
- Limited home health services
Most people pay $0 premium for Part A if they or a spouse paid Medicare taxes for at least 10 years. Without that history, premiums run up to $565/month.
What Medicare Part B Covers
Part B covers care outside the hospital — the everyday services that keep you healthy and manage chronic conditions.
- Doctor visits, primary and specialist
- Outpatient care, ER visits, urgent care
- Preventive screenings and wellness exams
- Durable medical equipment (walkers, oxygen, wheelchairs)
- Mental health services, labs, and diagnostics
The standard 2026 premium is $202.90/month, though higher income earners pay more through IRMAA surcharges.
What Original Medicare Doesn't Cover
This is the part that catches people off guard. Original Medicare does not pay for:
- Prescription drugs taken at home (that's Part D)
- Routine dental care
- Routine vision care and eyeglasses
- Hearing aids
- Long-term custodial care (help with bathing, dressing, eating)
- Care overseas, except limited emergencies
- Cosmetic surgery, except when medically necessary
How Much Original Medicare Costs
Even for services Medicare does cover, you share the cost through deductibles and coinsurance:
| Part A | Part B | |
|---|---|---|
| 2026 Deductible | $1,736 per benefit period | $283 per year |
| Your share after deductible | $0/day (days 1–60); $434/day (days 61–90); $868/day (days 91–150, lifetime reserve days) | 20% of the approved amount, no cap |
There's no out-of-pocket maximum on Original Medicare. According to the Kaiser Family Foundation, beneficiaries spend an average of $7,000 a year on healthcare, and roughly 1 in 5 spend more than 20% of their income on medical costs.
That uncapped exposure is the single biggest reason people look at supplemental coverage — more on that below.
Who Can Enroll
You qualify for Part A and Part B if you're a U.S. citizen or permanent legal resident, and:
- You're turning 65, and you or a spouse paid Medicare taxes for 10+ years, or
- You've received Social Security Disability Insurance for 24 months, or
- You have end-stage renal disease or ALS
How to Enroll
If you're already collecting Social Security four months before turning 65, you're enrolled automatically — your card arrives in the mail, no forms needed.
If not, you'll need to sign up yourself through ssa.gov, by phone, or in person. You get a seven-month Initial Enrollment Period (IEP): three months before your birthday month, your birthday month, and three months after. Enrolling early in that window means coverage starts right on time.
Miss it, and you could face a permanent Part B late-enrollment penalty — 10% added to your premium for each 12-month period you delayed.
Still working at 65 with employer coverage? You may be able to delay Medicare penalty-free if your employer has more than 20 employees — but confirm with HR that your plan counts as creditable coverage first.
How Most People Fill the Coverage Gaps
Since Original Medicare leaves real gaps — no drug coverage, no cap on out-of-pocket costs, no dental or vision — most people pair it with something else. There are three main paths:
Medigap (Medicare Supplement) is designed to fills in the gaps for deductibles, copays, and coinsurance Original Medicare leaves behind, and lets you keep seeing any provider nationwide with no referrals or prior authorization. About 14 million people are enrolled in a Medigap plan today.
Medicare Advantage replaces Original Medicare entirely with a private plan, often bundling extra benefits — but usually with a provider network and prior authorization requirements. A 2023 OIG report found Medicare Advantage plans denied about 13% of prior authorization requests that would have been approved under Original Medicare.
Part D adds standalone prescription drug coverage, which neither Part A nor Part B includes.
Because this decision has the biggest long-term impact on your costs and flexibility, we've given it its own space:
Want to see what Medigap plans cost in your ZIP code? Compare rates from multiple companies in a few minutes.
Compare Medigap RatesFAQs
- Does Original Medicare cover everything my employer plan did?
- Can I add Medigap and Part D to Original Medicare?
- Is Original Medicare cheaper than Medicare Advantage?
- What happens if I miss my enrollment window?
- Can I see any doctor with Original Medicare?
