What?s The Difference Between Medicare Part A and Part B?

If you are nearing 65, you may have heard about Medicare Part A and Part B. These two elements make up the foundational components of Original Medicare. But when it comes to securing your health and managing your budget, what exactly is the difference between Medicare Part A and Part B?

In this article, we will break down the crucial differences between Medicare Part A and Part B, and explain how they complement each other to provide you with the comprehensive health insurance coverage you deserve.

How are Part A and Part B defined?

The Centers for Medicare and Medicaid Services (CMS) provides a clear Medicare Part A definition as follows:

• Medicare Part A includes coverage for inpatient care in hospitals, including critical access hospitals and skilled nursing facilities (SNF) (though not for custodial or long-term care). Part A also covers necessary surgeries, a semi-private room and meals during a hospital stay, and some essential home health care.

In addition, Part A also compassionately covers hospice care for terminally-ill patients, offering support when it is needed most.

Under special cases, Part A covers confinement in the following types of hospitals:

• Acute care facilities
• Critical access hospitals
• Inpatient rehabilitation centers
• Long-term care hospitals
• Inpatient psychiatric care facilities
• Qualified clinical research studies

Meanwhile, the definition of Medicare Part B focuses on a different aspect of your health journey:

• Medically necessary and preventive services received in an outpatient setting to keep you healthy and out of the hospital.

• Outpatient care
• Doctors' visits
• Physical and occupational therapy
• Laboratory tests
• Durable medical equipment (DME)
• Flu shots and certain vaccines
• Emergency room services
• Ambulance services

The lists provided above are not exhaustive, but they give you a strong general idea of the differences in coverage between Medicare Part A and Part B.

Before we go any further, we should clearly mention that prescription drugs and other specialized benefits such as routine dental, vision, and hearing are not covered by Medicare Parts A and B. You can, however, get coverage for these additional benefits through Part C (Medicare Advantage) plans and dedicated drug coverage through Part D plans.

Is there a difference in eligibility requirements for Medicare Part A and Part B?

You are generally qualified for Medicare Part A if you are:

• A US citizen (or a permanent resident for five consecutive years); and
• 65 or older

If you are below 65, you can also be qualified for Part A and access this vital safety net if you have been:

• Receiving Social Security disability benefits for at least 24 months
• Diagnosed with end-stage renal disease (ESRD) or Amyotrophic Lateral Sclerosis (ALS)

Medicare Part B eligibility follows the exact same qualifying criteria as Part A. Therefore, there is no difference between Medicare Parts A and B as far as basic eligibility is concerned.

Are Medicare Parts A and B free?

Part A premiums are typically free, as long as you (or your spouse) have paid Medicare taxes for at least ten years (or 40 quarters). If not, then you will typically need to pay a monthly premium to secure your Medicare Part A coverage.

Does Medicare cover 100% of hospital bills?

No. To avoid any unexpected financial stress, it is vital to know that with Original Medicare you are still personally responsible for copays and deductibles when you use healthcare services.

For Medicare Part A, even though your premiums are typically free:

• You must pay a substantial deductible of $1,736 (in 2026) for any stay in a hospital before your Part A coverage starts. This covers your first 60 days of a hospital stay.
• From the 61^st to the 90^th day, you pay a steep coinsurance of $400 per day (in 2026).
• After 90 days, you pay 100% of the costs, or $800 per day (in 2026), for any unused 'lifetime reserve days' (you have 60 reserve days that can be used over your entire lifetime).

When it comes to Medicare Part B premiums, there is another major difference compared to Medicare Part A: generally, everyone needs to pay Part B monthly premiums.

The standard monthly premium for Medicare Part B is $202.90 (in 2026). But if your income (based on your tax returns from two years ago) exceeds a certain amount, your Part B premium will be adjusted upward.

Part B also has an annual deductible of $283 (in 2026). After reaching this deductible, you will pay a flat 20% coinsurance for all Part B services received, which can lead to hefty out-of-pocket costs.

Is there a difference between enrollment periods for Medicare Part A and Part B?

There is no difference in enrollment periods between Medicare Part A and Part B. You can seamlessly enroll in Parts A and/or Part B during the following enrollment periods:

• Initial Enrollment Period (IEP) – a crucial seven-month period that starts three months before the month of your 65^th birthday
• General Enrollment Period (GEP) – from January 1 to March 31 if you happened to miss your IEP
• Special Enrollment Period (SEP) – available if your case falls under a "qualifying event," like losing your employer coverage

Is there a difference between Medicare Part A and Part B late enrollment penalties?

There are potentially severe late enrollment penalties for both Medicare Part A and B that can haunt your finances for years.

Late enrollment penalties apply if you don't have either Medicare in place when you turn 65, or other coverage that Medicare formally considers 'creditable' (this typically means robust employer-provided insurance).

Here is a clear summary of the penalties you should aim to avoid:

Conclusion

Now that you are aware of the key differences between Medicare Parts A and B, you can confidently make an informed decision about your healthcare options. Remember to carefully take advantage of applicable enrollment periods in order to protect yourself and avoid incurring unnecessary, lifelong penalties.