Summary & Overview
CPT 77600: Superficial Hyperthermia, Tissue Depth up to 4 cm
CPT code 77600 denotes a superficial hyperthermia procedure in which tissue near the surface of a body site is exposed to heat up to 113°F, limited to a penetration depth of 4 cm. This code captures a specific therapeutic modality used in oncology and other specialties to augment local treatment by raising tissue temperature in a controlled fashion. Nationally, accurate coding of this service matters for clinical documentation, appropriate billing, and tracking utilization of specialized thermal therapies.
Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, common sites of service, and typical service descriptors for CPT code 77600.
This publication will summarize available benchmarks and common billing practice considerations, outline clinical indications tied to superficial hyperthermia, and note where input data is not available. The content is designed for revenue cycle leaders, billing professionals, and clinicians seeking a clear, national-level reference on how CPT code 77600 is described, where it is typically performed, and which major payers commonly cover related services.
Billing Code Overview
CPT code 77600 describes a superficial hyperthermia procedure in which the provider exposes tissue near the surface of a body site to elevated temperatures up to 113 degrees Fahrenheit, with a maximum depth of 4 cm. The procedure is used to deliver controlled heat to targeted superficial tissues as part of therapeutic treatment.
Service type: Therapeutic hyperthermia (superficial)
Typical site of service: Outpatient clinic, outpatient hospital department, or ambulatory surgical setting where superficial thermal therapies are provided
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with a superficial soft-tissue or cutaneous malignancy or a localized recurrent tumor near the skin surface referred for adjunctive regional hyperthermia. The patient presents to an outpatient oncology infusion suite or hospital-based radiation oncology department. The clinical workflow begins with a consult by a radiation oncologist or medical oncologist who documents the indication, tumor location, prior treatments (surgery, radiation, chemotherapy), and informed consent for hyperthermia. A pre-procedure assessment includes focused skin and lesion examination, review of implanted devices, and vital signs. On the day of service, nursing prepares the treatment area; the provider positions the hyperthermia applicator over the lesion, confirms surface depth (no deeper than 4 cm), and gradually raises regional tissue temperature up to approximately 113°F while monitoring patient comfort and skin integrity. Continuous temperature monitoring and cardiac/respiratory observation occur throughout the session. Sessions are typically repeated per protocol (multiple fractions over weeks) and combined with radiation therapy or chemotherapy as clinically indicated. Documentation includes diagnosis, treatment site, duration, measured temperatures, patient tolerance, and any complications. Typical site of service is an outpatient oncology clinic, radiation therapy suite, ambulatory surgical center, or hospital outpatient department. Providers commonly involved are radiation oncologists, medical oncologists, and specially trained proceduralists or technologists under physician supervision.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 |