Summary & Overview
CPT 77615: Invasive Tumor-Directed Hyperthermia with Multiple Probes
CPT code 77615 represents invasive, probe-based tumor hyperthermia in which more than five probes or needles are inserted directly into a tumor to elevate tissue temperatures beyond what external hyperthermia techniques achieve. This code captures a specialized interventional oncology service used to sensitize tumors to adjunctive therapies or to provide direct cytotoxic thermal effects. Nationally, the procedure is relevant because it aligns with expanding interventional oncology techniques and complex procedural coding that can affect hospital outpatient and ambulatory surgery reimbursement and utilization.
Key payers in this overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise policy and billing-focused briefing: what the code denotes clinically, typical sites of service, common modifiers associated with procedural coding (provided in the input), and where to look for coverage guidance. The publication summarizes benchmark considerations and clinical context for use of invasive hyperthermia, highlights payer coverage patterns where available, and notes when input data is not present. The section on practical billing considerations addresses documentation elements implied by the service description and the relationship of 77615 to related interventional oncology procedures.
This summary is written for a national audience of coding professionals, clinicians involved in interventional oncology, and payers seeking clarity on a specialized procedural code.
Billing Code Overview
CPT code 77615 describes a procedure in which the provider inserts an array of more than five probes or needles into a tumor to deliver therapeutic hyperthermia at higher temperatures than external applications of the same technique. This is an invasive tumor-directed hyperthermia procedure intended to heat tissue internally using multiple probes to achieve therapeutic temperatures.
Service Type: Interventional thermal ablation / invasive hyperthermia therapy
Typical Site of Service: Hospital outpatient department or ambulatory surgical center, or other procedural settings where image-guided, invasive tumor-directed procedures are performed.
Clinical & Coding Specifications
Clinical Context
A patient with a focal solid tumor (commonly hepatic, pelvic, or deep soft-tissue tumor) is referred for image-guided interstitial hyperthermia using multiple invasive probes. Typical patient: a 62-year-old with recurrent colorectal liver metastases who previously underwent systemic chemotherapy and now presents with a 4–6 cm hepatic lesion not amenable to resection. Pre-procedure workup includes cross-sectional imaging (contrast CT or MRI), laboratory evaluation (CBC, coagulation panel, liver function), and multidisciplinary review. The procedure is performed in an interventional radiology or radiation oncology suite with image guidance (CT or ultrasound) under moderate sedation or general anesthesia. The provider inserts an array of more than five probes or needles into the tumor to deliver localized heating to cytotoxic temperatures, monitoring probe placement and thermal dose in real time. Post-procedure observation includes pain control, monitoring for bleeding or infection, and short-term imaging follow-up to assess treatment response and identify complications. Documentation includes indication, imaging guidance used, number and type of probes inserted, thermal parameters, complications, anesthesia type, and post-procedure instructions.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | For substantially greater work, time, or complexity than usual for the procedure |