Medicare Out-of-Pocket Maximum: How It Works

# Medicare Out-of-Pocket Maximum: How It Works

One of the most important—and most misunderstood—facts about Original Medicare is that it has no annual out-of-pocket maximum. That means your 20 percent coinsurance under Part B can accumulate without a ceiling, and the Part A per-benefit-period deductible can repeat if you have multiple hospital stays in a year. For most people, that exposure is manageable. But for anyone facing a serious illness or repeated hospitalizations, the financial risk can be substantial. Understanding how out-of-pocket limits work—and where they do and don't exist in Medicare—is essential to choosing the right coverage.

Original Medicare Has No Out-of-Pocket Cap

Under Original Medicare (Parts A and B alone), there is no federal limit on what you can spend in a calendar year. After you meet your Part B deductible, Medicare pays 80 percent of the approved amount for covered outpatient services and you pay the remaining 20 percent. For an expensive surgery, a long course of outpatient chemotherapy, or repeated specialist visits, that 20 percent can add up to tens of thousands of dollars.

Part A carries its own exposure as well:

• The inpatient hospital deductible applies per benefit period, not per year, and can be charged multiple times if you have separate hospital stays separated by at least 60 days.
• After 60 days in the hospital within a single benefit period, daily coinsurance begins and increases again after 90 days.
• Skilled nursing facility stays beyond 20 days carry daily coinsurance as well.

There is no mechanism within Original Medicare itself that stops this spending from growing. That gap is precisely why supplemental coverage exists.

How Medicare Advantage Provides an Out-of-Pocket Maximum

Medicare Advantage (Part C) plans are required by federal law to include an annual out-of-pocket maximum for covered Part A and Part B services. Once you reach that limit within a calendar year, the plan pays 100 percent of covered costs for the remainder of the year.

A few key points about how this works in practice:

• CMS sets a federal ceiling on how high the out-of-pocket maximum can be; plans may set a lower cap than the federal ceiling, but not higher. Visit Medicare.gov or contact the plan for the current year's limit.
• The cap typically applies only to in-network services. If you use out-of-network providers and your plan has an out-of-network benefit, a separate—and usually higher—out-of-pocket limit may apply.
• Part D drug costs are generally tracked separately under a distinct cost-sharing structure and do not count toward the medical out-of-pocket maximum.
• Plans may also have combined in-network/out-of-network maximums, so always read the Summary of Benefits carefully.

Because the out-of-pocket maximum resets every January 1, a serious health event late in the year offers less financial protection than the same event early in the year.

How Medigap Fills the Gap in Original Medicare

Rather than replacing Original Medicare, Medigap (Medicare Supplement) plans work alongside it. Many Medigap plan letters are designed specifically to cap or eliminate the cost-sharing that Original Medicare leaves behind.

• Plan G, currently the most popular plan for new enrollees, covers the Part A deductible, Part A coinsurance, and all Part B coinsurance after you pay the Part B deductible yourself. This effectively creates a very low annual out-of-pocket ceiling.
• Plan N covers most of the same costs but requires small copayments for office visits and emergency room visits that do not result in an admission.
• Plan F (available only to those who were eligible for Medicare before January 1, 2020) covers the Part B deductible as well, leaving nearly zero out-of-pocket exposure for covered services.

With a robust Medigap plan, your predictable annual costs are essentially the monthly premium plus the Part B deductible—a structure that many beneficiaries find easier to budget than an open-ended coinsurance obligation.

Comparing Your Options: Medicare Advantage vs. Medigap

Both approaches protect you from unlimited cost exposure, but they do it differently and come with trade-offs:

• Medicare Advantage often has lower or no monthly premiums but may require copayments for each service and limits you to a network. The out-of-pocket maximum provides a hard ceiling, but reaching it—especially on a fixed income—can still be a significant sum.
• Medigap typically carries higher monthly premiums but minimizes per-service costs. You keep your Original Medicare provider access (any provider who accepts Medicare), which matters if you travel frequently or split time between states.
• Drug coverage works differently in each path: Medigap requires a separate Part D plan, while Medicare Advantage plans with drug coverage bundle it together.

The right choice depends on your health, budget, travel habits, and the specific plans available in your ZIP code. Comparing total annual cost—not just premium—is the most reliable way to evaluate your options.

Frequently Asked Questions

Q: Does Original Medicare have any out-of-pocket protection at all? A: Original Medicare alone does not have an annual out-of-pocket maximum for Part A and Part B services. Your cost-sharing can accumulate without a cap. Supplemental coverage—either a Medigap plan or a Medicare Advantage plan—is the primary way beneficiaries protect themselves from unlimited exposure.

Q: How high can the out-of-pocket maximum be on a Medicare Advantage plan? A: CMS sets a federal ceiling each year; individual plans may set their cap lower than that limit. Because the ceiling changes annually, check Medicare.gov or the plan's Summary of Benefits for the current figure. Plans with lower out-of-pocket maximums may charge higher premiums, so compare total estimated cost for your expected usage.

Q: Does hitting the Medicare Advantage out-of-pocket maximum cover my prescriptions too? A: Generally, no. The out-of-pocket maximum on a Medicare Advantage plan typically applies to Part A and Part B medical costs. Prescription drug costs under Part D are usually tracked separately and do not count toward the medical maximum. Review your plan's Evidence of Coverage to understand exactly which costs apply to each limit.

Have questions about your Medicare options? Lynsey Brennan (FL License #G007269) offers free consultations in FL, TX, AZ, GA, NC, SC, PA, OH, TN, VA. Call (561) 735-1490 or book online.

We do not offer every plan available in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.