CPT 77770Radiology

Hdr rdncl ntrstl/icav brchtx

CPT 77770 covers high dose rate (HDR) radiation therapy delivered internally through catheters or applicators placed directly in or near a tumor. This advanced treatment delivers concentrated radiation doses in short sessions.

Showing rates for

National Average

Base Medicare rate

$339.31

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

1.95

PE RVU (NF)

8.42

MP RVU

0.12

Total RVU

10.49

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Bill 77770 per fraction delivered, not per applicator or channel used
Impact: Prevents underbilling when multiple applicators are used in single session; ensures proper $339.31 per fraction reimbursement
Verify treatment planning codes (77295, 77316-77318) are billed separately and only once per treatment course
Impact: Planning codes reimburse $200-$900 separately; billing planning with each fraction triggers denials and potential audit flags
Document exact start and stop times of radiation delivery with total dose and dose rate in medical record
Impact: Qualifies as HDR (>12 Gy/hr) versus LDR; prevents downcoding or denials worth $339.31 per session
Do not bill 77770 on same day as applicator insertion (57155, 58346) without modifier 59 when medically distinct
Impact: Without proper modifier, bundling edits may reduce payment by $339.31; modifier 59 preserves separate reimbursement
Coordinate billing with hospital for split-billing scenarios to avoid duplicate claims
Impact: Prevents rejections and recovery actions; clarifies whether facility bills TC and physician bills 26 component
Report medical physics consultation (77336) separately from 77770 when physics evaluation occurs
Impact: Captures additional $150-$200 for physicist services that are separately reimbursable and not bundled into treatment delivery

Common denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 77770 in 2025?

The 2025 Medicare national average payment for CPT 77770 is $339.31 for both facility and non-facility settings. This rate is based on 10.49 total RVUs multiplied by the 2025 conversion factor of 32.3465.

How many times can CPT 77770 be billed per patient?

CPT 77770 is billed once per HDR brachytherapy fraction delivered. A complete treatment course may involve multiple fractions (commonly 2-5 for gynecologic cancers, 1-4 for prostate), with each fraction billed separately. Total fractions depend on prescribed treatment plan and must be medically necessary and documented.

What is the difference between CPT 77770 and 77771?

CPT 77770 covers high dose rate (HDR) brachytherapy at >12 Gy/hour using remote afterloading, while 77771 covers the same service for multiple fractions. However, 77771 was deleted from CPT; bill 77770 for each individual HDR fraction delivered.

Can CPT 77770 be billed with applicator insertion codes on the same day?

Yes, but modifier 59 or XU is typically required to bypass NCCI bundling edits. Applicator insertion (such as 57155 for tandem and ovoids, or 55875 for prostate needles) is a separate procedure from treatment delivery. Documentation must clearly show both services were performed and medically necessary.

Does CPT 77770 include the treatment planning codes?

No, CPT 77770 covers only the treatment delivery. Treatment planning is billed separately using codes 77295 (therapeutic radiology simulation), 77316-77318 (brachytherapy isodose planning), and 77336 (physics consultation). Planning codes are billed once per treatment course, not per fraction.

What documentation is required to support billing CPT 77770?

Required documentation includes physician's treatment order, physics plan with dose rate >12 Gy/hr, treatment delivery record with start/stop times and total dose, physician presence during treatment, radiation safety verification, quality assurance checks, and patient tolerance assessment. Missing any element increases audit risk.

What are the RVU values for CPT code 77770 in 2025?

CPT 77770 has 2025 RVU values of: Work RVU 1.95, Practice Expense RVU 8.42 (both facility and non-facility), Malpractice RVU 0.12, totaling 10.49 total RVUs. The higher PE RVU reflects the expensive equipment and specialized physics support required.