Summary & Overview
CPT 77799: Clinical Brachytherapy Unlisted Procedure
CPT code 77799 denotes an unlisted clinical brachytherapy procedure used when no specific CPT code describes the service. Nationally, unlisted procedure codes like 77799 are important for documenting and billing individualized or novel brachytherapy techniques that lack established codes. Use of 77799 typically prompts additional documentation and payer review because the service must be described and justified relative to standard, codified brachytherapy procedures.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of how 77799 is used in clinical practice, typical sites of service, the implications for claims review, and what types of documentation payers commonly request when processing unlisted brachytherapy claims. Where available, benchmarks and policy considerations for handling unlisted brachytherapy services are summarized.
This publication provides practical context for billing teams, compliance officers, and radiation oncology clinicians seeking to understand coding pathways for non-routine brachytherapy procedures. Data not available in the input is noted where relevant.
Billing Code Overview
CPT code 77799 is an unlisted procedure code used to report a clinical brachytherapy procedure that does not have a specific CPT code. This code captures individualized brachytherapy treatments that fall outside established, codified brachytherapy descriptors.
Service Type: Clinical brachytherapy procedure
Typical Site of Service: Hospital-based radiation oncology suites or outpatient radiation therapy centers
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient scenario involves an adult oncology patient requiring site-specific intracavitary or interstitial brachytherapy where no precise CPT descriptor exists. For example, a 68-year-old patient with an uncommon pelvic soft-tissue malignancy receives a customized high-dose-rate brachytherapy implant under moderate sedation in an outpatient hospital-based radiation oncology suite. The clinical workflow includes pre-procedure imaging and planning (CT/MRI-based treatment planning), multidisciplinary review by radiation oncology and medical physics, device placement (catheters or applicators) in the procedure room or operating room, delivery of radiation fractions using a remote afterloader, and post-treatment recovery with same-day discharge or short observation. Documentation includes indication, informed consent, implant details (type and number of applicators), dosimetry report, fractionation schedule, personnel involved, and any adjunct services (anesthesia, imaging guidance, physics time). Billing uses 77799 when the brachytherapy procedure performed does not have a specific listed CPT code and the record supports an unlisted clinical brachytherapy service.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required is substantially greater than typical for the unlisted brachytherapy procedure and documentation supports the increased work. |