Medicare Part B does cover immunosuppressive drugs, but only if three things are true: Medicare helped pay for your organ transplant, you were enrolled in Part A when the transplant happened, and you have Part B when the prescriptions are filled.1Centers for Medicare & Medicaid Services. Immunosuppressive Drugs When those conditions are met, you pay a $283 annual deductible in 2026 and then 20% of the Medicare-approved amount for your medications.2Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles Kidney transplant recipients have an additional option, called Part B-ID, that keeps drug coverage in place indefinitely even after other Medicare benefits end.3Centers for Medicare & Medicaid Services. Medicare Part B Immunosuppressive Drug Benefit
Who Qualifies for Part B Drug Coverage
All three conditions must be true at once: the transplant took place at a Medicare-approved facility, you had Part A on the date of surgery, and you have Part B when the drug is dispensed.1Centers for Medicare & Medicaid Services. Immunosuppressive Drugs If your transplant happened before you had Part A, Part B will not cover your anti-rejection drugs at all. In that case, coverage generally has to come through Medicare Part D.
The qualifying transplant types are kidney, heart, liver, lung, heart-lung, bone marrow, stem cell, and intestinal. Whole-organ pancreas transplants qualify when done alongside or after a kidney transplant, and standalone pancreas transplants qualify if they meet Medicare’s clinical criteria.1Centers for Medicare & Medicaid Services. Immunosuppressive Drugs
The 36-Month Cliff for Kidney Recipients and Part B-ID
People whose Medicare eligibility comes solely from end-stage renal disease used to lose all Medicare coverage 36 months after a successful kidney transplant, including coverage for the drugs keeping the new kidney alive. Since January 1, 2023, a benefit called Part B-ID lets those individuals keep Medicare coverage specifically for immunosuppressive drugs, with no time limit.3Centers for Medicare & Medicaid Services. Medicare Part B Immunosuppressive Drug Benefit
You qualify for Part B-ID if you had Medicare based on ESRD, that coverage ended 36 months after a successful kidney transplant, and you are not enrolled in any other health coverage that includes immunosuppressive drugs. Disqualifying coverage is broader than most people expect: employer or individual health plans, Marketplace plans, TRICARE for Life, VA enrollment or VA drug eligibility, and Medicaid or CHIP that includes immunosuppressive drugs.3Centers for Medicare & Medicaid Services. Medicare Part B Immunosuppressive Drug Benefit If you pick up any of that later, you should disenroll from Part B-ID. If that coverage ends, you can re-enroll at any time.
One boundary matters a great deal here. Part B-ID covers immunosuppressive drugs and nothing else. It is not health insurance. Doctor visits, hospital stays, lab work, and every other medical service fall outside it.4Social Security Administration. POMS HI 00805.400 – Medicare Part B Immunosuppressive Drug Coverage (Part B-ID)
How to Enroll in Part B-ID
Enrollment opens once your Part A ends, and there is no closed window. Call Social Security at 1-877-465-0355 (TTY 1-800-325-0788), or mail form CMS-10798 to the Social Security Administration, Office of Central Operations, PO Box 32914, Baltimore, Maryland 21298-2703.3Centers for Medicare & Medicaid Services. Medicare Part B Immunosuppressive Drug Benefit The date of your transplant relative to January 1, 2023, does not matter; what matters is meeting the eligibility conditions today.
What You’ll Pay in 2026
Your costs depend on which Medicare path you are on.
With standard Part B, you pay a $202.90 monthly premium in 2026, a $283 annual deductible, and 20% of the Medicare-approved amount for your immunosuppressive drugs after the deductible.2Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles5Medicare. Costs There is no annual cap on that 20%.
With Part B-ID only, the 2026 premium is $121.60. The same $283 deductible and 20% coinsurance apply once you begin filling prescriptions.2Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
Higher-income beneficiaries pay an income-related monthly adjustment amount (IRMAA) on top of the premium, based on your tax return from two years earlier. For Part B-ID in 2026, IRMAA begins above $109,000 in income for single filers and $218,000 for joint filers, and the surcharge climbs in steps to $486.50 for single filers at $500,000 or more (joint filers at $750,000 or more).2Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
Ways to Reduce Your Costs
If you have full Medicare Part B, a Medigap supplemental policy can cover some or all of the 20% coinsurance. Plans A, B, C, D, F, G, M, and N pay 100% of Part B coinsurance; Plans K and L cover 50% and 75%.6Medicare. Compare Medigap Plan Benefits Medigap generally requires enrollment in both Part A and Part B, which means someone enrolled only in Part B-ID typically cannot buy a Medigap plan to cover drug coinsurance.7Medicare. Getting Started with Medicare Supplement Insurance
If your income and resources are limited, a state Medicare Savings Program may pay your Part B-ID premium and, in some cases, the deductible and coinsurance.8Medicaid.gov. CMS Technical Instructions – Reporting Beneficiaries Dually Eligible for Medicaid and Medicare Part B-Immunosuppressive Drug (ID) Benefits to T-MSIS Contact your state Medicaid office to apply. Note that full Medicaid coverage includes immunosuppressive drugs on its own and would disqualify you from Part B-ID, so an MSP (which pays Medicare costs without duplicating drug coverage) is the version that works here.
When Medicare Part D Covers These Drugs Instead
Part B is not the only route to coverage. If your transplant happened before you had Part A, or if you take immunosuppressives for a condition other than an organ transplant, such as rheumatoid arthritis or lupus, Part B will not pay. Medicare Part D will, provided the medication is on your plan’s formulary.9Medicare. Prescription Drugs (Outpatient)
Part D plans are sold by private insurers, so premiums and copays vary. Two 2026 numbers are worth knowing: no Part D plan can charge a deductible higher than $615, and your total out-of-pocket drug spending is capped at $2,100 a year, after which covered drugs cost you nothing for the remainder of the calendar year.10Medicare. How Much Does Medicare Drug Coverage Cost11Centers for Medicare & Medicaid Services. Final CY 2026 Part D Redesign Program Instructions For expensive immunosuppressive regimens, that $2,100 ceiling can be a meaningful advantage over Part B’s uncapped 20%.
Two smaller points round this out. Part B can cover immunosuppressives administered through durable medical equipment such as an infusion pump when medically necessary, regardless of transplant history.9Medicare. Prescription Drugs (Outpatient) And Medicare Part A picks up immunosuppressive drugs given during an inpatient hospital stay, since those are billed as part of the hospital admission rather than as outpatient prescriptions.