Medicare Part A is often described as “free,” but like most things in healthcare, that’s only part of the story. While many people do qualify for Part A with no monthly premium, that doesn’t mean your hospital stay is fully covered—or that enrollment is always automatic.
In this blog, we’ll break down what Part A really costs in 2026 and walk through the important enrollment rule that could protect you from expensive gaps in coverage.
First, Why Some People Get Part A for Free
If you or your spouse worked at least 10 years (or 40 quarters) while paying Medicare taxes, you’re eligible for premium-free Part A. That means you don’t pay a monthly fee to have this coverage.
Roughly 99% of Medicare enrollees qualify for Part A without a premium.
But if you haven’t met that 40-quarter requirement, things change. In 2026:
- If you worked 30–39 quarters, Part A will cost you $311 per month
- If you worked fewer than 30 quarters, the monthly premium jumps to $565 per month
This group—those who don’t qualify for premium-free Part A—is also the only group subject to Part A penalties if they delay enrollment. The penalty is an extra 10% added to your premium for twice the number of years you went without enrolling when eligible.
What You’ll Pay When You Use Part A
Even if your Part A is “free,” you’re still responsible for out-of-pocket costs if you’re hospitalized. In 2025, those costs include:
- $1,736 deductible per benefit period
- $0 per day for hospital days 1–60
- $434 per day for days 61–90
- $868 per day for days 91–150 (lifetime reserve days)
- 100% of all costs after day 150
Part A also covers short-term skilled nursing care following a qualifying hospital stay. You’ll pay:
- $0 per day for the first 20 days
- $217 per day for days 21–100
- All costs after day 100
This is why many people choose to add a Medicare Supplement or Medicare Advantage plan—to avoid getting hit with thousands of dollars in unexpected costs if a hospital stay stretches beyond the standard window.
The Part A Enrollment Rule That Trips People Up
Not everyone is automatically enrolled in Medicare at 65. If you’re already receiving Social Security benefits, Medicare will enroll you in Part A (and Part B) automatically. But if you’re not receiving Social Security, you’ll need to sign up yourself through the Social Security Administration.
Now here’s where the rule gets important: If you’re eligible for Medicare and not actively covered by employer insurance, you’re required to enroll in Part A when you turn 65.
Failing to do so—especially if you’re relying on COBRA, ACA coverage, or retiree benefits—could leave you responsible for medical costs that Medicare would otherwise cover. These plans only work as secondary coverage if Medicare is active first.
There’s also a key detail about Health Savings Accounts (HSAs). If you’re still working and contributing to an HSA, enrolling in Medicare Part A (even if it’s free) will disqualify you from making further HSA contributions. In this case, enrolling in Part A early could end up being a costly mistake.
How to Avoid Costly Coverage Gaps
Understanding when to enroll in Medicare Part A—and how it coordinates with your current or future insurance—is essential. Whether you’re:
- Turning 65 while covered by COBRA or a retiree plan
- Planning to work past 65 with employer coverage
- Considering delaying Part B but not Part A
It’s important to know how your decisions will affect coverage, timing, and costs.
If you miss the right enrollment window, you may not just pay a penalty—you could be on the hook for thousands of dollars in hospital or skilled nursing bills that you thought were covered.