Radiation Therapy Cost: What to Expect in 2026

1. Cost by radiation therapy type

Radiation therapy is not a single treatment—it encompasses several distinct technologies with different costs, treatment durations, and clinical applications. Here is a breakdown of the major modalities and their 2026 cost ranges:

Cost ranges above represent the total bill including treatment planning, simulation, daily delivery, and quality assurance. The daily delivery charge (e.g., one unit of CPT 77386) is just one component of a multi-code billing structure. BillKarma’s data shows that when billing errors occur in radiation therapy, patients are overcharged by an average of $4,200 per case.

Look up what Medicare pays for your radiation therapy delivery code:

2. What a typical treatment course involves

Radiation therapy billing is complex because a single course generates many distinct billable services over weeks or months. Understanding the components helps you audit your final bill:

A 30-fraction IMRT course with daily IGRT and weekly physician visits generates approximately 35 to 40 line items across the billing statement. Each line must be verified against your treatment records.

3. Insurance coverage and prior authorization

Prior authorization (PA) is required for radiation therapy by nearly all commercial insurers. Treatment without PA approval puts you at risk for a denied claim and a five-figure bill. Here is how to navigate the PA process:

1. Your radiation oncologist initiates PA. The physician’s office submits a PA request that includes your diagnosis, staging, the proposed modality, the number of fractions, and clinical justification.
2. PA review typically takes 3 to 14 days. Do not begin simulation or treatment until you have a PA approval letter in hand with an authorization number.
3. Confirm what is authorized. PA approval often specifies the number of fractions authorized. If your treatment course requires additional fractions, a new PA must be obtained before delivering those fractions.
4. Verify your treatment facility is in-network. Large academic cancer centers and specialty radiation facilities are sometimes out-of-network for regional insurance plans. Confirm the facility address, not just the health system name.
5. Appeal denials with clinical evidence. If your insurer denies IMRT or proton therapy, your radiation oncologist can submit a peer-to-peer review with clinical guidelines (ASTRO, NCCN) supporting the chosen modality.

4. Medicare Part B radiation coverage

Medicare Part B covers radiation therapy delivered in hospital outpatient departments and freestanding radiation therapy facilities. Coverage includes:

• Treatment planning and simulation
• Daily radiation treatment delivery (all CPT codes 77385–77435)
• Physician management visits during treatment (77427)
• Image-guided radiation therapy add-ons (77387)
• Stereotactic radiosurgery (77432, 77435) for approved indications

Medicare pays 80% of the approved amount after your Part B deductible. For a 30-fraction IMRT course, total Medicare-approved charges typically run $12,000 to $20,000, of which you owe 20% ($2,400 to $4,000) plus any remaining deductible. Medicare Supplement plans typically cover this 20% coinsurance.

Site of care matters under Medicare: the same treatment delivered in a hospital outpatient department carries a facility fee that can add $5,000 to $15,000 to the total bill compared to a freestanding radiation oncology facility. Medicare pays a higher rate at hospital outpatient departments, but your 20% coinsurance on a higher allowed amount means you pay more out of pocket at the hospital setting.

5. Proton therapy coverage challenges

Proton therapy is the most expensive radiation modality and the most frequently denied by insurers. Here is what you need to know if proton therapy is recommended for you:

• Strongest coverage: Pediatric cancers, ocular melanoma, base-of-skull tumors, chordomas, and chordosarcomas. Clinical evidence of superiority over photon therapy is well-established for these indications.
• Contested coverage: Prostate cancer proton therapy. Medicare covers it, but some commercial plans require documentation of clinical necessity. Many academic medical societies support proton therapy for prostate cancer; insurer policies vary.
• Brain tumors and breast cancer: Coverage is improving as evidence accumulates, but prior authorization battles are common.
• If denied: Request a peer-to-peer review between your radiation oncologist and the insurer’s medical reviewer. Submit ASTRO and NCCN clinical practice guideline citations. If the peer-to-peer fails, file an external appeal with your state insurance commissioner. External appeal overturn rates for proton therapy are above average.

6. How to find in-network radiation facilities

Radiation therapy facilities require specialized equipment (linear accelerators, proton gantries, treatment planning systems) that limits the number of available sites. Finding an in-network facility is important because out-of-network radiation therapy can cost tens of thousands of dollars more over a treatment course. Steps to take:

1. Use your insurer’s facility directory. Search specifically for “radiation oncology” or “radiation therapy center” by zip code. Filter to your specific plan network, not just the insurer family.
2. Verify at the point of referral. When your oncologist refers you to a specific radiation center, ask their staff to confirm in-network status with your insurer before scheduling simulation.
3. Consider freestanding vs. hospital-based. Freestanding radiation oncology centers offer the same treatment quality at significantly lower facility fees. If both are in-network, the freestanding option typically results in lower cost-sharing for patients with deductibles.
4. Ask about the treatment team. Confirm the radiation oncologist, radiation physicist, and dosimetrist are all employed by or contracted with an in-network facility. Separate billing for these services is common.

7. Financial assistance for radiation therapy

Multiple organizations provide financial support for radiation therapy patients:

Radiation therapy at major cancer centers often requires daily travel for weeks. The American Cancer Society’s Hope Lodge provides free lodging near treatment centers for patients who must travel—a benefit worth $3,000 to $8,000 for a 6-week treatment course if you would otherwise need a hotel or extended-stay rental.

8. Radiation therapy billing codes explained

Radiation therapy billing uses a structured hierarchy of CPT codes that begins with planning and extends through the final treatment fraction. Understanding which codes should appear on your bill helps you verify accuracy:

9. Common radiation billing errors

BillKarma’s data shows radiation therapy bills overcharge patients by an average of $4,200 per case when errors occur. The most common errors in radiation oncology billing:

1. Wrong number of fractions billed: The most common error. If your prescription called for 30 fractions but 32 are billed, the overcharge for IMRT delivery plus IGRT add-ons is approximately $1,000 per extra fraction. Count the dates of service on your itemized bill and compare to your treatment calendar.
2. Wrong intensity code (77385 vs. 77386): Complex IMRT (77386) reimburses approximately 20% more than simple IMRT (77385). Upcoding from simple to complex adds $40 to $50 per fraction (Medicare rates) or $100 to $250 per fraction at typical hospital charge rates.
3. IGRT billed on non-IGRT days: Image guidance (CPT 77387) is only appropriate when imaging is actually performed and used for treatment verification. Billing 77387 for every fraction when imaging was only performed on weekly verification days is a billing error.
4. Planning code billed per fraction instead of per course: CPT 77295 (IMRT planning) is a per-course code, not a per-fraction code. If it appears 30 times on your bill for a 30-fraction course, that is a significant error.
5. Duplicate treatment management fees: CPT 77427 covers physician management for each set of 5 fractions. For a 30-fraction course, this code should appear 6 times. If it appears more frequently, question the billing.

Frequently asked questions

Sources

• CMS Medicare Physician Fee Schedule 2026 — Radiation Oncology
• CMS Hospital Outpatient PPS 2026 — Radiation Therapy
• American Society for Radiation Oncology (ASTRO): Patient Information
• RTAnswers.org: ASTRO Radiation Therapy Patient Resource
• NCCN Clinical Practice Guidelines in Oncology
• American Cancer Society: Hope Lodge Program
• KFF: Prior Authorization in Medicare Advantage