Infusion and biologic bills (Crohn's, UC, RA)

If you get a biologic drug by infusion for Crohn's disease, ulcerative colitis (UC), or rheumatoid arthritis (RA), the bills repeat. Every few weeks, a new visit brings a new set of charges. Some lines look large, and some use terms you've never seen.

This page explains each charge on a biologic infusion bill, what your plan may require, and how to check what you owe. It's part of our guide on how to appeal an insurance denial. Because infusions repeat, fixing 1 error can save you money at every visit after.

The bills you'll get

Most infusion visits create a few kinds of charges. They may come on 1 bill from the infusion site, or on separate bills. Each should match an explanation of benefits (EOB) from your plan.

How the drug line works

The drug code's description names the drug and the amount in 1 unit, like "infliximab, 10 mg." The units on your bill tell how many of those amounts you got.

So if your dose is 400 mg and each unit is 10 mg, the bill should show 40 units. If some of a single-use vial was thrown away, Medicare rules let the provider bill that part on a separate line with the code JW. That's not a duplicate.

Why it may say chemotherapy

Medicare's billing rules let some biologics, like infliximab and rituximab, be billed with chemotherapy administration codes. These codes are for complex drugs that need close watching. Seeing "chemotherapy" on your bill doesn't mean you got chemotherapy.

What does it cost?

Biologic drugs cost a lot, and prices vary by drug, dose, and site of care. Medicare's 2024 spending data shows the average cost of the drug alone. It doesn't include administration or facility fees. These are Medicare prices, including your share.

Private plans pay their own prices, which can differ from Medicare's. With Original Medicare and no extra coverage, you'd usually pay 20%. On a $6,545 claim, that's $1,309.

What you pay depends on your deductible, coinsurance, and yearly limit. In 2026, most private plans cap your in-network costs for covered care at $10,600 for 1 person or $21,200 for a family. Your plan's limit may be lower.

Where you get the infusion matters

The same drug can cost more in one setting than another. A hospital outpatient department may add a facility fee that a doctor's office or stand-alone infusion center doesn't.

Medicare is narrowing that gap. Starting in 2026, Medicare pays off-campus hospital departments a lower, office-level rate for drug administration. CMS estimated this would save people with Medicare $70 million in coinsurance. Our guide to facility fees on medical bills explains how these fees work.

Many private plans have site-of-care rules. For example, 1 large insurer's 2026 policy covers hospital outpatient infusions only for people who meet certain medical criteria. Others may be asked to use a doctor's office, infusion suite, or home infusion.

What goes wrong most often

Most problems with infusion bills fall into a few groups. Each one has a next step.

• Prior authorization is denied or runs out. Your plan may need to approve the drug before you start. Approvals may only last for a set time, so ask when yours ends. See prior authorization denied.
• Step therapy. Your plan may want you to try a less costly drug first, like a biosimilar. Your doctor can ask for an exception if that drug isn't right for you.
• A site-of-care denial. Your plan may approve the drug but not the hospital setting. If you have a medical reason for that setting, your doctor can send records and ask for an exception.
• Wrong units or repeated lines. A drug line may show more units than your dose. An administration charge may appear twice. See duplicate charges on a medical bill and common medical billing errors.
• Copay help that doesn't count. Your plan may not count a drug company's help toward your deductible. A large bill can arrive when the help runs out.
• A claim denied after the visit. The EOB will give a reason. See what to do when insurance didn't pay a medical bill, and our guide to claim denial codes explained.

Your protections

Your protections depend on your coverage.

If you have private health insurance, you can appeal a denial of the drug, the dose, or the site of care. You have 180 days from the denial notice to file an internal appeal. If your plan still says no, you can ask for an external review within 4 months. Your plan must accept the outside reviewer's decision.

If a delay could seriously harm your health, ask for an urgent appeal. You can ask for an urgent external review at the same time, which is decided within 72 hours or sooner. Our guide to external review for health insurance explains each step.

Drug company copay help. There are 2 kinds of plan programs to know about:

In 2023, a federal court struck down a rule that let many plans exclude copay help from your cost sharing. As of September 2026, federal agencies haven't issued a new rule. Many states limit accumulator programs, but state laws don't apply to self-funded employer plans. Ask your plan in writing how it treats copay help. See copay cards, accumulators, and maximizers for how to tell which one your plan uses.

If you have Medicare, Part B covers most drugs given by IV or shot by a licensed provider. Drugs you usually give yourself are generally covered by Part D instead.

• In 2026, you pay the $283 Part B deductible, then usually 20% of the Medicare-approved amount for the drug.
• Your coinsurance may be lower for some Part B drugs whose prices rose faster than inflation. The list changes every quarter.
• Medigap Plans A, B, C, D, F, G, M, and N pay all of the Part B coinsurance, though Plan N has some small copays. Plan K pays 50%, and Plan L pays 75%.
• For Part D drugs, your out-of-pocket costs are capped at $2,100 in 2026.
• If a Medicare Advantage plan uses step therapy for Part B drugs, it can apply it only to new starts. If you've had the drug in the past 365 days, step therapy shouldn't apply.
• Drug company copay cards usually can't be used with Medicare, because of federal anti-kickback rules. Independent charities may help instead.

State rules may add more protections. Your state insurance department can tell you what applies where you live.

How to check your bills

Because infusions repeat, it's worth checking the first few bills closely. Once they're right, later bills are easier to check.

1. Match each bill to its EOB. Check the date of service and the provider. Our guide to comparing your medical bill vs. EOB shows how.
2. Check the drug units. Ask your doctor's office for your dose. Divide it by the amount in 1 unit. The answer should match the units billed, plus any wasted amount marked JW.
3. Count the administration lines. There's usually 1 "first hour" charge per visit for each IV line. Added hours should match how long the infusion took.
4. Look for supplies billed on their own. The IV start, flush, and standard tubing are usually part of the administration charge.
5. Check for a facility fee. If you see one, ask whether the site is part of a hospital.
6. Check copay help. If you use a copay card, compare your plan's deductible tracker with what you've paid.
7. Ask for an itemized bill. If a bill shows only a total, ask for every line with its code and units. See how to get an itemized bill.

Say Andre gets infliximab every 8 weeks at a hospital infusion center. His dose is 400 mg. He has met his deductible, and his plan's coinsurance is 20%. His itemized bill shows these allowed amounts.

Line on the bill	Units	Allowed amount	Is it right?
Infliximab, 10 mg	40	$4,000	Yes. 400 mg ÷ 10 mg = 40 units.
Infusion, first hour	1	$500	Yes
Infusion, each added hour	1	$200	Yes. His infusion took about 2 hours.
Infusion, first hour (again)	1	$500	No. He had 1 IV line.
IV start kit and tubing	1	$80	No. It's part of the infusion charge.
Total		$5,280

His plan paid the claim as billed, so his EOB shows his share as 20% of $5,280. That's $1,056.

Without the 2 extra lines, the total is $4,700. His share would be $940. That's $116 less for this visit, and it could add up over a year of infusions.

Andre calls the billing office and asks them to correct the claim and send it to his plan again. He waits for the new EOB before he pays.

If a call doesn't fix it, put it in writing. Our duplicate charge letter and medical bill dispute letter give you the words.

How to avoid a surprise next time

A few checks can prevent many problems before your next infusion.

• Ask when your approval ends. Write the date on your calendar. Ask your doctor's office to request renewal a few weeks before.
• Confirm your site of care. Ask your plan whether your infusion site is in your network and allowed under its site-of-care rules.
• Ask which benefit covers the drug. Your plan may cover it as a medical benefit or a pharmacy benefit. That can change your share, your deductible, and who asks for approval.
• Ask how copay help counts. If you use a copay card, ask your plan whether that help counts toward your deductible. Ask the drug company how much help is left for the year.
• Get an estimate when something changes. A new drug, dose, or site can change your cost. Ask your plan's member services for an estimate.
• Review your options at open enrollment. Check each plan's drug list and site-of-care rules. Our guide on how to choose a health insurance plan explains what to compare.

When to get help

You can fix many infusion bill problems yourself. It's worth getting help when:

• Your plan denied the drug, the dose, or the site, and you need to appeal.
• The provider won't correct a bill with wrong units or repeated lines.
• A large bill arrived after your copay help ran out.
• You're managing infusion bills for a family member.

Start with your insurer's member services number on your card. Your state insurance department or consumer assistance program can help with appeals. For employer plans, the Department of Labor's Employee Benefits Security Administration answers questions at 1-866-444-3272. For Medicare, call 1-800-MEDICARE (1-800-633-4227), or get free counseling from your State Health Insurance Assistance Program (SHIP).

Patient Advocate Foundation, a nonprofit, offers free case management for people with serious illness. A medical bill advocate can make the calls for you. For a large bill or a lawsuit, an attorney can explain your options.

If your bills are correct but too much to pay, ask the drug company about patient assistance programs. Our guides to hospital charity care and medical payment plans cover other options. If your infusions are part of cancer care, see our guide to cancer treatment bills. </content> </invoke>