CPT 77600Radiology

Hyperthermia ext gen supfc

CPT code 77600 covers superficial hyperthermia treatment, where heat is applied to the surface of the body to destroy cancer cells or make them more responsive to radiation therapy. This controlled heating treatment typically targets tumors close to the skin surface.

Showing rates for

National Average

Base Medicare rate

$527.89

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

1.31

PE RVU (NF)

14.9

MP RVU

0.11

Total RVU

16.32

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

NCCI bundling edits

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Billing tips

Document exact treatment duration, temperature achieved, and depth of heating with invasive thermometry readings at multiple time points throughout the session
Impact: Prevents denials worth $527.89 per session; temperature documentation is the most common audit trigger for hyperthermia codes
Bill 77600 only for superficial treatments (up to 3-4 cm depth); use 77605 for deep regional hyperthermia or 77610-77615 for interstitial/intracavitary approaches
Impact: Incorrect depth coding results in automatic denials; deep treatment codes reimburse higher but require different documentation
Verify medical necessity by documenting concurrent or recent radiation therapy (within same treatment course) in the operative note
Impact: Standalone hyperthermia without radiation correlation faces 70-80% denial rates; clear linkage to radiation plan is essential
Report hyperthermia on separate claim line from radiation treatment delivery (77401-77416) with modifier 59 to prevent bundling
Impact: Without modifier 59, NCCI edits bundle hyperthermia into radiation delivery, losing $527.89 reimbursement per treatment
Submit claims within the treatment course timeline, not as isolated sessions; include treatment plan documenting total planned hyperthermia sessions
Impact: Isolated session claims face medical necessity denials; documented treatment series shows appropriate care planning
Ensure physicist quality assurance documentation is in the medical record, including equipment calibration and treatment field verification
Missing physicist documentation triggers technical component denials; required for compliance with radiation oncology standards

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 77600 in 2025?

The 2025 Medicare national average reimbursement for CPT 77600 is $527.89 for both facility and non-facility settings, based on 16.32 total RVUs and a conversion factor of 32.3465.

How many times can CPT 77600 be billed per patient treatment course?

There is no specific Medicare limit on the number of 77600 treatments per course, but typically 6-12 sessions are performed in conjunction with radiation therapy. Each session must be medically necessary and documented, with most protocols calling for 1-2 treatments per week during the radiation course.

What is the difference between CPT 77600, 77605, and 77610?

CPT 77600 is for superficial hyperthermia (0-4 cm depth), 77605 is for deep regional hyperthermia treating larger volumes at greater depths, and 77610-77615 cover interstitial or intracavitary hyperthermia using implanted probes. The depth of the target tissue and heating methodology determine the correct code.

Can CPT 77600 be billed on the same day as radiation treatment?

Yes, 77600 can be billed with radiation treatment codes (77401-77416) on the same day, but modifier 59 should be appended to the hyperthermia code to indicate it is a distinct procedural service and prevent NCCI bundling edits from denying payment.

What documentation is required to bill CPT 77600?

Required documentation includes treatment site location, heating modality used, total treatment time, serial temperature measurements showing achievement of 40-45°C therapeutic range, patient tolerance, physician supervision notes, correlation to radiation therapy plan, and medical physicist quality assurance verification.

Do commercial payers cover CPT 77600 hyperthermia treatments?

Coverage varies significantly by payer. While Medicare covers 77600 when medically necessary with radiation therapy, many commercial payers consider hyperthermia investigational or experimental. Prior authorization is typically required, and some payers have specific clinical guidelines limiting coverage to certain tumor types or clinical trial settings.

What are the Work RVUs for CPT code 77600?

CPT 77600 has 1.31 Work RVUs, 14.9 Practice Expense RVUs (both facility and non-facility), and 0.11 Malpractice RVUs, totaling 16.32 RVUs. The practice expense component represents the majority of the reimbursement due to equipment and technical staff costs.