CPT 77615Radiology

Hyperthermia ntrstl prb>5

CPT code 77615 covers interstitial hyperthermia treatment using more than 5 probes, a technique that heats deep tissues to help treat certain cancers. This specialized procedure involves inserting multiple probes into the tumor to deliver controlled heat therapy.

Showing rates for

National Average

Base Medicare rate

$1,031.53

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

1.84

PE RVU (NF)

29.82

MP RVU

0.23

Total RVU

31.89

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

NCCI bundling edits

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Billing tips

Document exact number of probes used with anatomical placement sites, as CPT 77615 requires >5 probes; if 5 or fewer, use 77610 instead
Impact: Using wrong code costs $407.71 (difference between 77615 at $1031.53 and 77610 at $623.82)
Bill on the date of hyperthermia treatment, not radiation therapy date, unless performed same day; link to appropriate oncology diagnosis with ICD-10 malignancy codes
Impact: Improves first-pass claim acceptance rate by 35-40% and reduces medical necessity denials
Separately document treatment planning, probe placement procedure notes, temperature monitoring logs, and physicist quality assurance reports
Impact: Reduces audit recoupment risk and supports modifier 22 claims for increased complexity worth potential 20-30% payment increase
Verify payer-specific policies on hyperthermia coverage before treatment; many commercial payers have investigational or experimental exclusions
Impact: Prevents complete denials; obtain prior authorization which increases approval rate from 40% to 85%
Report technical and professional components separately when physician does not own equipment; facility bills TC, physician bills 26
Impact: Ensures proper reimbursement split and prevents claim rejection for duplicate billing
Do not bill 77615 with same-session superficial hyperthermia (77600) or external hyperthermia (77605-77620) without modifier 59 and clear anatomical distinction
Impact: Prevents bundling denials and NCCI edits that could forfeit entire $1031.53 payment

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 77615 in 2025?

The 2025 Medicare national average payment for CPT 77615 is $1031.53 for both facility and non-facility settings. This rate is based on 31.89 total RVUs (1.84 work RVU, 29.82 PE RVU, 0.23 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.

What is the difference between CPT 77615 and 77610?

CPT 77615 is for interstitial hyperthermia using more than 5 applicator probes, while 77610 covers the same procedure with 5 or fewer probes. The probe count must be clearly documented, as 77615 reimburses at $1031.53 compared to 77610's lower rate. Accurate probe counting is critical for correct code selection.

How many RVUs is CPT code 77615 worth?

CPT 77615 has 31.89 total RVUs in 2025, consisting of 1.84 work RVUs, 29.82 practice expense RVUs (same for facility and non-facility), and 0.23 malpractice RVUs. The high PE RVU reflects the expensive specialized equipment required for multi-probe interstitial hyperthermia.

Can CPT 77615 be billed with radiation therapy codes on the same day?

Yes, CPT 77615 can be billed with radiation therapy codes as hyperthermia is a distinct adjunctive service designed to enhance radiation effectiveness. However, clear documentation of separate services is required, and modifier 59 may be necessary to prevent bundling denials. Verify payer-specific policies as some carriers have NCCI edits.

Do I need prior authorization to bill CPT 77615?

Most commercial payers require prior authorization for CPT 77615 due to hyperthermia being considered investigational or experimental for many indications. Medicare typically does not require prior authorization but may have coverage limitations based on diagnosis. Always verify payer-specific coverage policies before treatment to avoid denials.

What documentation is needed to support billing CPT 77615?

Required documentation includes proof of >5 probes with specific anatomical placement sites, temperature monitoring data from each probe, treatment duration, medical physicist involvement, correlation with radiation/chemo protocols, and medical necessity justification. Probe placement diagrams and temperature logs are particularly important for audit defense.

What medical specialties typically bill CPT code 77615?

CPT 77615 is primarily billed by radiation oncologists, with some surgical oncologists and interventional radiologists also performing the procedure. It requires specialized training in hyperthermia therapy and typically involves medical physicist collaboration. The procedure is most commonly performed in academic medical centers and comprehensive cancer centers with specialized equipment.