Romi Care

Radiation therapy bills explained

Updated October 1, 2026 · How we write our guides

Quick answer

A radiation therapy bill has charges for planning your treatment, for each treatment session, and for your doctor's weekly care. Medicare counts the weekly charge once for every 5 sessions, not by calendar week. To check your bill, compare the number of sessions billed with your treatment calendar. Then match each bill to your explanation of benefits.

Radiation therapy often means treatment most weekdays for several weeks. The bills can come just as often. Some charges appear once, some for every session, and some once a week.

This guide explains each charge and how to check the count. It's part of our guide to cancer treatment bills. If you also get infusions, see our guide to your chemotherapy bill. For help with drug costs, see help paying for cancer drugs.

What's on a radiation therapy bill?

Radiation therapy has a few stages. Each one brings its own charges.

StageWhat happensHow often it's billed
First visitYou meet the radiation oncologist, who decides on treatmentOnce
SimulationYour team takes images, often a CT scan, to map the area to treatUsually once, before treatment starts
Planning and dose mathYour doctor plans the dose, and a physicist or dosimetrist checks the mathUsually once per plan
DevicesMasks, molds, or blocks that hold you still or shape the beamOnce per device
Treatment deliveryThe radiation itselfEach session
Image guidanceImages taken to aim the beam before or during a sessionVaries
Treatment managementYour doctor's oversight of your careOnce for every 5 sessions
Physics checkA physicist's review of your treatmentOnce for every 5 sessions

Planning and simulation

Planning happens before your first treatment. Your team maps the area to treat and decides the dose. They may make a mask or mold so you lie the same way each time. If your plan changes during treatment, some planning may be billed again.

With a type of treatment called intensity-modulated radiation therapy (IMRT), the planning charge includes the simulation's field settings. Medicare's coding rules say those shouldn't be billed again on their own.

Treatment and image guidance

The center bills for each treatment session. Image guidance uses scans or X-rays to aim the beam. For some treatment types, it's part of the session charge. For others, it's billed as its own line.

Your doctor's weekly care

Your radiation oncologist bills for managing your treatment. Medicare counts this once for every 5 sessions, whatever the calendar says. Routine visits with your radiation oncologist during treatment are usually included.

Under Medicare's rules, routine follow-up care for 90 days after your last treatment is also part of this charge. So is checking your charts, reviewing your dose, and managing side effects.

Facility and professional charges

If you get radiation at a hospital, the hospital bills for the equipment, staff, and space. That's the facility or technical part. Your doctor bills for their work, which is the professional part. A freestanding center may send just 1 bill. Our guide to facility fees on a medical bill explains the difference.

How the weekly count works

Medicare counts weekly treatment management by sessions, not calendar weeks. Here's the rule.

  • Every 5 sessions count as 1 week.
  • 3 or 4 extra sessions at the end count as 1 more week.
  • 1 or 2 extra sessions at the end don't add a week.
Sessions in your courseWeekly management charges
61
82
184
286

Many private plans follow similar rules, but check with yours. Each physics check usually follows the same 5-session count.

Why this happens: common radiation bill problems

Most problems fall into a few groups.

  • Weekly charges counted by calendar week. A course that runs longer because of holidays or breaks shouldn't add charges.
  • A session billed that didn't happen. Missed or moved sessions may still appear on the bill.
  • Visits billed on their own during treatment. Routine visits are usually part of the weekly charge.
  • Simulation billed with an IMRT plan. For IMRT, the plan already includes the simulation's field settings.
  • A missing or expired approval. Many plans need to approve radiation before it starts. If your plan approves fewer sessions or a different type, your doctor can ask for more. See prior authorization denied.
  • An out-of-network doctor at an in-network hospital. Federal law usually limits what they can bill you. See whether the No Surprises Act applies.

What to do: check your radiation therapy bill

  1. Keep a treatment calendar. Write down each session date, or ask the center for a printed list.
  2. Ask for an itemized bill. It should list each charge with its date. See how to get an itemized bill.
  3. Count the sessions. The number of treatment charges should match your calendar.
  4. Count the weekly charges. Use the table above to check your doctor's weekly management charges.
  5. Look for extra visits. Ask about any routine office visit billed during treatment.
  6. Match each bill to your explanation of benefits (EOB). Your amount due shouldn't be more than your share on the EOB for in-network care. Our guide to comparing a medical bill and an EOB shows how.
  7. Call the billing office. Ask them to correct any error, send a corrected claim, and hold your account while they check.
Examplechecking the session count

Say Andre has Original Medicare and has already met his Part B deductible. He gets 28 radiation sessions over 7 calendar weeks, because of a holiday break. His calendar shows 28 sessions.

His bills show 29 treatment sessions at $500 each, and 7 weekly management charges at $200 each. Under Medicare's count, 28 sessions means 6 weekly charges.

ChargeBilledShould beDifference
Treatment sessions29 × $500 = $14,50028 × $500 = $14,000$500
Weekly management7 × $200 = $1,4006 × $200 = $1,200$200
Total$15,900$15,200$700

Andre's share is 20%. The extra charges added 20% of $700, or $140, to what he owes. He calls the billing office with his calendar and asks for a corrected claim.

When to get help

You can often fix a count error with 1 call. It's worth getting help when:

  • The provider won't correct a bill that doesn't match your calendar or your EOB.
  • Your plan denied radiation therapy or approved fewer sessions than your doctor ordered. Our prior authorization appeal letter is a place to start.
  • An out-of-network bill looks like one the No Surprises Act should have stopped.

Start with your insurer's member services number on your card. For Medicare, call 1-800-MEDICARE (1-800-633-4227), or get free counseling from your State Health Insurance Assistance Program. For surprise bills, call the No Surprises Help Desk at 1-800-985-3059.

Many cancer centers have a financial counselor who can help. Patient Advocate Foundation, a nonprofit, offers free case management for people with serious illness. A medical bill advocate can make the calls for you.

Common questions

Why do I get so many bills for radiation therapy?

Radiation therapy has several steps, and more than 1 provider may bill. The center bills for each session, the planning, and the equipment. Your radiation oncologist bills for planning and weekly care. If the center is part of a hospital, the hospital and your doctor send separate bills. Each should match its own explanation of benefits.

What is radiation treatment management on my bill?

It's your radiation oncologist's charge for overseeing your care during treatment. That includes checking your charts and dose, seeing you, and adjusting the plan. Medicare counts 1 unit for every 5 treatment sessions, not for each calendar week. Routine visits with your radiation oncologist during treatment are usually part of this charge.

What is a radiation simulation?

It's a planning session before treatment starts. Your care team takes images, often a CT scan, to map the area to treat. They may mark your skin or make a mask or mold to help you lie the same way each time. It's billed as part of planning, usually before your first treatment.

How much does radiation therapy cost with Medicare?

With Original Medicare, Part B covers outpatient radiation therapy. After the $283 Part B deductible in 2026, you usually pay 20% of the Medicare-approved amount. At a hospital outpatient department, your copayment for each service can't be more than the Part A deductible. A Medigap policy may pay some or all of your share.

Do I need prior authorization for radiation therapy?

Many plans require approval before radiation therapy starts. Your radiation oncologist's office usually asks for it. Ask them to tell you when it's approved and how many sessions it covers. If your plan changes the treatment type or number of sessions, ask the office whether they can send more records or appeal.

Check your bill before you pay

A printable list of what to look for on any medical bill, with a link to help for each item.

Sources

  1. Medicare claims processing manual, chapter 13: radiology services (section 70), Centers for Medicare & Medicaid Services. Accessed October 1, 2026.
  2. Medicare NCCI policy manual, chapter 9: radiology services (2026), Centers for Medicare & Medicaid Services. Accessed October 1, 2026.
  3. Radiation therapy, Medicare.gov. Accessed October 1, 2026.
  4. Outpatient hospital services, Medicare.gov. Accessed October 1, 2026.
  5. 2026 Medicare Parts A & B premiums and deductibles, Centers for Medicare & Medicaid Services. Accessed October 1, 2026.
  6. Preauthorization (glossary), HealthCare.gov. Accessed October 1, 2026.
  7. Know your rights with insurance, Centers for Medicare & Medicaid Services. Accessed October 1, 2026.

This is general information, not legal or medical advice. Rules can depend on your plan and your state. Romi Care isn't an insurer, law firm, collection agency, or government program.

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