Yes, Medicare covers most infusion therapy, but which part of Medicare pays, and what you owe, depends on where you get the infusion and how the drug is given. Infusions in a doctor’s office or hospital outpatient department are paid under Part B. Home infusions are split between a dedicated Part B home infusion benefit and Part D, depending on the drug and equipment. Infusions during a hospital or skilled nursing stay are bundled into Part A. Your share of the cost ranges from nothing beyond the inpatient deductible to a 20% coinsurance with no annual cap on outpatient drugs, so the setting matters as much as the diagnosis.
Outpatient Infusions in an Office or Clinic
Part B covers infusion drugs given in outpatient settings, including doctor’s offices, hospital outpatient departments, and freestanding infusion centers. The requirement is that a licensed medical provider administers or directly supervises the infusion. Drugs you wouldn’t normally give yourself, such as chemotherapy agents, monoclonal antibodies, and certain immune therapies, sit at the core of the Part B drug benefit.1Medicare.gov. Prescription Drugs (Outpatient)
You pay 20% of the Medicare-approved amount after meeting the Part B deductible, which is $283 in 2026.2Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles Original Medicare puts no annual ceiling on that 20%. A biologic infusion priced at $10,000 per session generates $2,000 in coinsurance every time, treatment after treatment, which is why supplemental coverage becomes central for anyone on long-term infusion therapy.
Some Part B drugs now carry reduced coinsurance under the Inflation Reduction Act. When a manufacturer raises a drug’s price faster than inflation, Medicare recalculates your coinsurance against an inflation-adjusted amount, and the smaller bill reaches you without any paperwork on your end.3Centers for Medicare & Medicaid Services. Medicare Inflation Rebate Program
Home Infusions
Home infusions are covered, but the coverage splits into two paths depending on the drug and how it’s delivered.
The Part B Home Infusion Therapy Benefit
Since January 2021, Medicare has covered the professional services around home infusions under a dedicated Home Infusion Therapy benefit: nursing visits, caregiver training, and remote monitoring for drugs given intravenously or subcutaneously through a pump that qualifies as durable medical equipment.4Centers for Medicare & Medicaid Services. Home Infusion Therapy/Home IVIG Services Eligible drug categories include IV antibiotics, antivirals, and immune globulin, among others.
Medicare pays 80% of the approved amount for those professional services, and you pay the remaining 20%.5eCFR. 42 CFR 414.1550 – Basis of Payment Payment is per infusion drug administration calendar day: each day a skilled professional visits your home to give or oversee the infusion counts as one billable day.6Centers for Medicare & Medicaid Services. Home Infusion Therapy Services Benefit Beginning January 2021 Frequently Asked Questions
The pump itself is covered separately as durable medical equipment under Part B, but the supplier has to be enrolled in Medicare and accredited by a CMS-approved organization.7Centers for Medicare & Medicaid Services. Enroll as a DMEPOS Supplier If the supplier isn’t properly enrolled, both the pump claim and the drug claim can be denied. Before starting home infusion, confirm the supplier’s Medicare enrollment and make sure your physician has documented why the drug needs pump administration. That documentation is what triggers the coverage chain.
Intravenous immune globulin (IVIG) for primary immune deficiency disease gets its own treatment: it’s covered for home use when your provider determines it’s medically appropriate, and Part B also pays for related items and services tied to receiving IVIG at home.1Medicare.gov. Prescription Drugs (Outpatient)
When Part D Picks Up the Infusion Drug
Infusion drugs that don’t qualify for Part B usually fall under Part D. That generally means self-administered drugs, or home infusions that don’t involve a qualifying DME pump. Long-term IV antibiotic therapy and total parenteral nutrition (TPN) for patients who can’t eat conventionally are common examples.8Centers for Medicare & Medicaid Services. Medicare Drug Coverage Under Part A, Part B, and Part D
A limit worth knowing before treatment starts: Part D covers only the drug. Supplies to administer the infusion, such as IV tubing, needles, and alcohol swabs, are never covered under Part D.9Centers for Medicare & Medicaid Services. Medicare Prescription Drug Benefit Manual – Chapter 6 Professional nursing services tied to administering the drug are also excluded. Those supply and service costs land on you unless a Medicare Advantage plan bundles them as a supplemental benefit or another form of secondary coverage picks them up.
Infusions During a Hospital or Skilled Nursing Stay
When infusions happen during an inpatient hospital stay or in a skilled nursing facility, Part A covers the drugs as part of the facility’s overall payment. There’s no separate bill for each bag of IV fluid or each dose of medication. The facility folds drugs, nursing time, equipment, and supplies into a bundled rate.10Medicare.gov. Inpatient Hospital Care Coverage
In 2026, the Part A deductible is $1,736 per benefit period, and that covers the first 60 days of the stay, infusions included.11Federal Register. Medicare Program CY 2026 Inpatient Hospital Deductible and Hospital and Extended Care Services Coinsurance Amounts After that, daily coinsurance applies:
- Days 61 through 90 in the hospital: $434 per day
- Lifetime reserve days beyond 90: $868 per day
- Skilled nursing facility days 21 through 100: $217 per day
Infusions during those extended stays remain bundled into the daily rate rather than billed separately.2Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
How Medicare Advantage Changes the Picture
If you’re enrolled in a Medicare Advantage plan rather than Original Medicare, the plan has to cover everything Original Medicare covers, but the rules around access and cost-sharing look different.
The biggest practical difference: Medicare Advantage plans can require prior authorization before approving an infusion. Original Medicare rarely requires prior authorization for Part B services.12Medicare.gov. Compare Original Medicare and Medicare Advantage Plans can also impose step therapy for biologic infusion drugs, requiring you to try a less expensive alternative before covering the prescribed drug. CMS authorized step therapy for Part B drugs in Medicare Advantage starting in 2019. If your specialist prescribes a specific biologic, you may need to satisfy the plan’s step therapy protocol or request an exception.
The offsetting benefit is a hard cap on out-of-pocket spending. In 2026, no Medicare Advantage plan can charge you more than $9,250 in out-of-pocket costs for covered services; once you reach that ceiling, the plan pays 100% for the rest of the year. Original Medicare has no equivalent cap on Part B coinsurance, which is why infusion patients on Original Medicare often need supplemental coverage.
Network rules matter too. If you need a specific oncologist or infusion center, confirm they’re in-network before enrolling in a Medicare Advantage plan. Out-of-network infusion services may cost far more or not be covered, depending on the plan type.
2026 Costs at a Glance
Part B outpatient infusions: $283 annual deductible, then 20% of the Medicare-approved amount per treatment, with no annual cap under Original Medicare.
Part D infusion drugs: up to a $615 deductible, then 25% coinsurance during the initial coverage stage, capped at $2,100 in out-of-pocket spending for the year. Once you hit $2,100, you pay nothing more for covered drugs for the rest of the year.13Medicare.gov. How Much Does Medicare Drug Coverage Cost? The older coverage gap (“donut hole”) no longer exists.
If reaching that $2,100 cap in a short window would strain your budget, the Medicare Prescription Payment Plan lets you spread Part D out-of-pocket costs into capped monthly installments instead of paying at the pharmacy counter. Every Part D plan has to offer this option; you opt in through your plan.14Centers for Medicare & Medicaid Services. Medicare Prescription Payment Plan
Part A inpatient infusions: $1,736 deductible per benefit period, covering all infusions during the first 60 days, then the daily coinsurance amounts listed above.
Cutting Your Out-of-Pocket Exposure
The uncapped 20% Part B coinsurance is the biggest financial risk for infusion patients on Original Medicare. Medigap (Medicare Supplement Insurance) plans exist to fill that gap. Most Medigap plan letters cover Part B coinsurance in full, so beyond the monthly Medigap premium and the annual Part B deductible, you’d owe nothing for outpatient infusions. For anyone on expensive biologic infusions without employer-sponsored or other secondary coverage, the arithmetic usually favors buying a Medigap policy.
Medicare Advantage’s built-in out-of-pocket maximum plays a similar protective role, with the tradeoff of a network and, often, prior authorization. Which route makes sense depends on your specific drug, your providers, and how much flexibility you need.
If Your Infusion Claim Is Denied
Medicare can deny an infusion claim because the drug wasn’t found medically necessary, because the provider didn’t submit proper documentation, or because the treatment setting didn’t meet coverage requirements. You’ll see the reason on the Medicare Summary Notice (Original Medicare) or Explanation of Benefits (Medicare Advantage).
You can appeal every denial. The appeals process has five levels, starting with a redetermination by the Medicare Administrative Contractor for Original Medicare or a reconsideration by your Medicare Advantage plan. You generally have 120 days from the denial notice to file a first-level appeal.15Medicare.gov. Filing an Appeal Ask your prescribing physician for a letter of medical necessity. Claims denied for documentation gaps are often the easiest to overturn, because the fix is submitting the records that should have been attached the first time.
If your denial comes from a Medicare Advantage plan’s prior authorization or step therapy requirement and delay could seriously harm your health, request an expedited appeal. Plans have to decide expedited appeals within 72 hours, which can keep an ongoing infusion schedule intact while the dispute is resolved.