If you're on Original Medicare — meaning traditional Part A and Part B without a Medicare Advantage plan — 2026 brings a fresh set of cost numbers you need to know before you schedule a procedure, fill a prescription, or plan your annual budget. These aren't small rounding errors. The increases this year affect what you pay every single month, what you owe the day you're admitted to a hospital, and what you'll spend at the pharmacy counter. Understanding each piece separately is the only way to avoid being blindsided.
Let's start with Part B, which covers outpatient care: doctor visits, lab work, preventive screenings, durable medical equipment, and most services you receive outside a hospital. The standard Part B monthly premium in 2026 is $185.00. That's up $10.30 from the $174.70 you paid in 2025. For most beneficiaries, this premium is automatically deducted from your Social Security check each month. The Part B annual deductible in 2026 is $257, up from $240 in 2025. Once you meet that deductible, Medicare pays 80% of approved costs and you pay the remaining 20% — with no upper limit on what that 20% can add up to over the course of a year.
High earners pay more. If your modified adjusted gross income from two years ago (meaning your 2024 tax return) exceeded $106,000 as an individual or $212,000 as a married couple filing jointly, you're subject to the Income-Related Monthly Adjustment Amount, known as IRMAA. In 2026, IRMAA surcharges range from an additional $74.00 per month all the way up to $443.90 per month on top of the standard premium, depending on your income bracket. That means the highest-income beneficiaries pay $628.90 per month for Part B alone. If you've had a significant income drop since 2024 — due to retirement, the death of a spouse, or a major life change — you can file Form SSA-44 with the Social Security Administration to request a reduction in your IRMAA surcharge based on more recent income.
Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. Most people don't pay a monthly premium for Part A if they or their spouse worked and paid Medicare taxes for at least 40 quarters (10 years). But Part A is far from free once you actually use it. The Part A inpatient hospital deductible in 2026 is $1,676 per benefit period. A benefit period begins the day you're admitted as an inpatient and ends when you've been out of the hospital or skilled nursing facility for 60 consecutive days. This is a critical distinction: unlike Part B's annual deductible, the Part A deductible resets with each new benefit period. If you're hospitalized in January, recover, and are readmitted in April, you owe that $1,676 again.
For longer hospital stays, the coinsurance structure in 2026 works like this: days 1 through 60 are covered after you pay the deductible. Days 61 through 90 cost you $419 per day in coinsurance. If your stay extends beyond 90 days, you can draw on your 60 lifetime reserve days, which cost $838 per day in 2026. Once those lifetime reserve days are exhausted, Medicare pays nothing — you're responsible for the full cost. For skilled nursing facility care following a qualifying hospital stay, the first 20 days are fully covered by Medicare. Days 21 through 100 require a daily coinsurance payment of $209.50 in 2026. After day 100, Medicare coverage ends entirely.
Here's the number that alarms many beneficiaries when they first hear it: Original Medicare has no out-of-pocket maximum. Under a Medicare Advantage plan, federal rules cap your annual out-of-pocket spending on covered services — in 2026, that cap can be no higher than $9,350 for in-network services. But with traditional Part A and Part B, there is no such ceiling. A beneficiary who has a serious illness, multiple hospitalizations, or a complex surgery could theoretically face $30,000, $50,000, or more in a single year with no protection from Medicare itself. This is the primary reason financial advisors and Medicare counselors consistently recommend that Original Medicare enrollees pair their coverage with a Medigap supplemental insurance policy.
Medigap — also called Medicare Supplement Insurance — is sold by private insurers and is designed to cover the gaps Original Medicare leaves behind: deductibles, coinsurance, and in some cases, foreign travel emergencies. The most comprehensive plans, Plan G and Plan N, are the most popular choices for new enrollees in 2026 since Plan F (which covered the Part B deductible) is no longer available to people who became eligible for Medicare after January 1, 2020. Plan G covers virtually everything except the Part B deductible, meaning after you pay your $257 annual deductible, you typically owe nothing for Medicare-approved services for the rest of the year. Monthly premiums for Plan G vary widely by insurer, your age, your gender, and where you live — but commonly range from $100 to $300 per month for a 65-year-old. Plan N is slightly less expensive but requires copays of up to $20 for office visits and up to $50 for emergency room visits that don't result in an inpatient admission.
Your ability to enroll in Medigap without medical underwriting — meaning an insurer cannot reject you or charge you more because of a pre-existing condition — depends heavily on timing. Your guaranteed issue window is the six-month period that begins the month you turn 65 and are enrolled in Part B. Outside that window, insurers in most states can use medical underwriting and may deny coverage or charge significantly higher premiums based on your health history. However, 13 states have enacted additional consumer protections. If you live in California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, or Oregon, you may have a birthday rule or other guaranteed issue window that allows you to switch Medigap plans annually without underwriting. New York and Connecticut go further, requiring guaranteed issue year-round regardless of age or health status.
Prescription drug costs under Part D also changed significantly in 2026, largely due to the Inflation Reduction Act's continued implementation. The catastrophic coverage threshold — the point at which Medicare pays 80% of your drug costs — now kicks in after you've spent $2,000 out of pocket in a calendar year. This is a major improvement from prior years when catastrophic coverage didn't begin until you'd spent over $8,000. Additionally, insulin costs for Medicare beneficiaries are capped at $35 per month per covered insulin product, and vaccines recommended by the Advisory Committee on Immunization Practices are available at no cost under Part D. If your income and resources are limited, the Extra Help program (also called the Low Income Subsidy) can dramatically reduce or eliminate your Part D premiums, deductibles, and copays — and in 2026, the eligibility threshold expanded, so beneficiaries who were previously denied may now qualify.
To get personalized help understanding exactly what you'll pay based on your specific health situation, income, and state of residence, contact your State Health Insurance Assistance Program, known as SHIP. SHIP counselors are trained, unbiased, and free — they do not sell insurance. You can find your local SHIP office at shiphelp.org or by calling 1-800-MEDICARE. If you believe your IRMAA surcharge is based on outdated income information, contact the Social Security Administration directly at ssa.gov or call 1-800-772-1213 to initiate an appeal. And if you're evaluating whether to stay in Original Medicare or switch to a Medicare Advantage plan during the next Annual Enrollment Period (October 15 through December 7), compare total potential out-of-pocket costs — not just monthly premiums — using the Medicare Plan Finder tool at medicare.gov/plan-compare.
