CPT 77610Radiology

Hyperthermia ntrstl prb 5/<

CPT code 77610 covers hyperthermia therapy delivered through 5 or fewer probes inserted directly into tissue, typically tumors. This thermal treatment heats cancer cells to damage or kill them, often used alongside radiation therapy.

Showing rates for

National Average

Base Medicare rate

$653.72

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)

18.79

MP RVU

0.11

Total RVU

20.21

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

NCCI bundling edits

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Billing tips

Accurately document and verify probe count before billing - use 77615 if 6 or more probes are required
Impact: Incorrect code selection results in $129+ payment differential and high audit risk; 77615 pays approximately $783 for more complex treatments
Bill concurrently with appropriate radiation therapy codes (77401-77418) when applicable, using modifier 59 if necessary
Impact: Hyperthermia enhances radiation efficacy; proper concurrent billing supports medical necessity and can total $900-$1,200 per treatment day
Document total treatment time, temperature monitoring records, and tissue temperature achieved for each probe
Impact: Missing temperature documentation is the #1 audit flag; comprehensive records prevent 100% of payment denials for insufficient documentation
Verify prior authorization requirements as most payers classify hyperthermia as requiring pre-approval
Impact: Lack of pre-authorization can result in complete denial of the $653.72 payment regardless of medical necessity
Report medical physics consultation separately (77336) for treatment planning when performed
Impact: Additional $150-200 reimbursement for physics planning services; often overlooked but separately billable
Use place of service code 22 (on-campus outpatient hospital) appropriately to receive facility rate
Impact: Both facility and non-facility rates are $653.72 for this code, but incorrect POS coding can trigger claim edits

Common denials

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 77610 in 2025?

The 2025 Medicare national average payment for CPT 77610 is $653.72 for both facility and non-facility settings. This rate is based on 20.21 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by geographic locality.

What is the difference between CPT 77610 and 77615?

CPT 77610 is used for interstitial hyperthermia with 5 or fewer probes, while 77615 covers treatment using more than 5 probes. The probe count threshold determines correct code selection. Using 77610 when 6+ probes were used constitutes undercoding and potential compliance risk.

Can CPT 77610 be billed with radiation therapy on the same day?

Yes, hyperthermia (77610) is commonly billed concurrently with external beam radiation therapy codes (77401-77418) as thermal treatment enhances radiation effectiveness. Use modifier 59 if necessary to indicate distinct procedural services and prevent inappropriate bundling. Document separate treatment times and medical necessity.

How many RVUs is CPT code 77610 worth in 2025?

CPT 77610 has 20.21 total RVUs in 2025, comprised of 1.31 work RVUs, 18.79 practice expense RVUs (both facility and non-facility), and 0.11 malpractice RVUs. This relatively high RVU value reflects the technical complexity and resource intensity of interstitial hyperthermia.

Is prior authorization required for CPT 77610?

Most commercial payers and Medicare Advantage plans require prior authorization for hyperthermia procedures due to medical necessity considerations for specific cancer types. Traditional Medicare does not universally require prior auth but coverage is limited to accepted indications. Always verify payer-specific requirements before scheduling.

What documentation is needed to bill CPT 77610 without denials?

Essential documentation includes: exact probe count (5 or fewer), anatomical probe locations, target temperatures achieved, temperature monitoring data at documented intervals, total treatment duration, concurrent radiation therapy plan, medical necessity justification for specific tumor type, and medical physics involvement. Missing temperature data is the most common documentation deficiency.

What specialties typically bill CPT code 77610?

Radiation oncologists most commonly bill 77610, followed by surgical oncologists and interventional radiologists in specialized cancer centers. Medical physicists are involved in treatment planning and quality assurance but typically bill consultation codes separately. The procedure requires specialized hyperthermia equipment not available in most general practice settings.