Medicare Part B Costs 2025: Premiums and IRMAA

Medicare Part B Premium Structure in 2025

Medicare Part B covers medically necessary outpatient services, doctor visits, lab tests, preventive services, durable medical equipment, and mental health care. In 2025, the standard monthly premium for Part B is $174.70, representing a $9.80 increase from 2024. This premium applies to the vast majority of Medicare beneficiaries — specifically those with a modified adjusted gross income (MAGI) of $103,000 or less for individuals, or $206,000 or less for married couples filing jointly.

The Part B premium is typically deducted directly from your Social Security benefit check. If you are not yet receiving Social Security benefits, you will receive a bill from Medicare that you must pay either quarterly or through automatic bank withdrawal. Missing premium payments can result in disenrollment from Part B and late enrollment penalties if you re-enroll later.

It is worth understanding that Part B is technically optional — you can delay enrollment if you have creditable employer coverage from a company with 20 or more employees. However, once you stop working or lose that coverage, you must enroll during a Special Enrollment Period to avoid late penalties. The Part B late enrollment penalty is 10% of the premium for each full 12-month period you could have had Part B but did not enroll. This penalty is permanent and remains for as long as you have Part B coverage.

IRMAA: The Income-Related Monthly Adjustment Amount

The Income-Related Monthly Adjustment Amount (IRMAA) is perhaps the most misunderstood aspect of Medicare Part B costs. IRMAA is an additional premium charged to higher-income beneficiaries, effectively creating a tiered pricing system based on income. In 2025, IRMAA kicks in for individuals with MAGI above $103,000 and couples above $206,000.

IRMAA is calculated using your modified adjusted gross income from your federal tax return two years prior. For your 2025 premiums, Social Security examines your 2023 tax return (or 2022 if your 2023 return is not yet available). This two-year lookback can create surprising situations — for example, someone who retired in 2024 with a dramatic income drop may still be paying IRMAA in 2025 based on their higher 2023 income.

The income thresholds create six tiers of Part B premiums. At the lowest IRMAA tier ($103,001–$129,000), the premium increases to $244.60 per month. At the highest tier (above $500,000 individual or $750,000 joint), the premium reaches $594.00 per month. These differences are substantial — the highest earners pay more than three times the standard premium, adding up to over $5,000 more per year.

IRMAA also applies to Part D premiums, adding an additional surcharge ranging from $12.90 to $81.00 per month depending on income. Combined Part B and Part D IRMAA surcharges can add up to $8,100 or more per year for the highest-income beneficiaries — a significant but often unexpected cost that should be factored into retirement income planning.

The Part B Annual Deductible and Coinsurance

Before Medicare Part B begins paying for covered services, you must meet an annual deductible of $240 in 2025 (up from $226 in 2024). This deductible resets each calendar year on January 1. After meeting the deductible, you typically pay 20% of the Medicare-approved amount for covered services, with Medicare paying the remaining 80%.

The 20% coinsurance is one of the most critical gaps in Medicare coverage because it has no annual cap. For routine doctor visits and preventive care, the 20% coinsurance amounts to relatively small out-of-pocket costs. However, for expensive treatments — such as cancer chemotherapy, major surgery, or extended physical therapy — the 20% can quickly escalate to thousands or even tens of thousands of dollars.

Consider a real-world example: A Medicare beneficiary diagnosed with cancer who receives $200,000 in outpatient chemotherapy and radiation treatments would owe approximately $40,000 in Part B coinsurance alone (20% of $200,000). Without supplemental coverage like Medigap, there is no limit on this obligation. This is precisely why healthcare financial planners strongly recommend that beneficiaries on Original Medicare consider a Medigap supplement or sufficient emergency savings.

Certain preventive services are covered at 100% with no deductible or coinsurance. These include the Annual Wellness Visit, most vaccines, cancer screenings (mammograms, colonoscopies, prostate cancer screenings), diabetes screenings, depression screenings, and cardiovascular screenings. Using these free preventive services can help detect health problems early when they are least expensive to treat.

How to Appeal an IRMAA Determination

If your income has changed significantly since the tax year used to calculate IRMAA, you may be able to request a reduction or elimination of the surcharge. The Social Security Administration accepts appeals based on specific life-changing events, including marriage, divorce or annulment, death of a spouse, work stoppage or reduction, loss of income-producing property, loss of pension, or receipt of an employer settlement payment.

To appeal, you must complete Form SSA-44 (Medicare Income-Related Monthly Adjustment Amount — Life-Changing Event) and provide documentation supporting your claim. For a work stoppage, this might include a letter from your former employer, your last pay stub, or a signed statement explaining when and why you stopped working. For a death or divorce, you would provide the corresponding legal documents.

The appeal process typically takes 30 to 60 days. If approved, the IRMAA reduction can be applied retroactively, and you may receive a refund for any overpayments. It is worth noting that the appeal is based on your current or anticipated income, not a temporary dip. Social Security will verify your next tax return to ensure the income reduction was genuine and ongoing.

Strategic income planning can also help reduce or avoid IRMAA. Working with a financial advisor who understands Medicare's income thresholds, you may be able to time Roth conversions, capital gains realizations, or retirement account distributions to stay below IRMAA trigger points. Even a small amount of income planning can save hundreds or thousands of dollars per year in Medicare premiums.

Part B Coverage: What's Included and What's Not

Part B covers a wide range of outpatient and ambulatory services. Doctor visits (both in-office and telehealth), diagnostic tests, outpatient hospital services, durable medical equipment (wheelchairs, walkers, hospital beds), ambulance services, mental health care, and clinical research studies are all covered under Part B. The program also covers some home health services that do not require a prior hospital stay.

However, Part B has important exclusions. It does not cover most dental care, routine eye exams for glasses or contact lenses, hearing aids or hearing exams for fitting hearing aids, cosmetic surgery, acupuncture (except for chronic lower back pain), long-term care, or most care received outside the United States. Understanding these exclusions is critical for budgeting healthcare costs in retirement.

Some services that were not historically covered have been added in recent years. Medicare now covers certain telehealth services, diabetes prevention programs, lung cancer screening with low-dose CT scans, and cardiac rehabilitation. Coverage for mental health services has also been expanded, with Medicare now covering up to 190 days of inpatient psychiatric care and unlimited outpatient mental health visits.

To maximize Part B value, take advantage of all free preventive services, find doctors who accept Medicare assignment (which limits what they can charge), and consider whether a Medigap plan makes financial sense given your health status. The Welcome to Medicare preventive visit, available within 12 months of enrolling, provides a comprehensive baseline health assessment at no cost.