Summary & Overview
CPT 77423: High Energy Neutron Radiation Therapy, Technical Component
CPT code 77423 represents the technical component of high energy neutron radiation therapy delivered to one or more isocenters. It captures the imaging, machine setup, beam delivery, and technical resources associated with neutron beam treatments that use coplanar or non‑coplanar geometries and may employ blocking, wedges, or compensators. This code matters nationally because neutron therapy is a specialized radiation modality with distinct technical requirements, limited availability, and implications for facility resource planning and reimbursement classification.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for neutron radiation delivery, typical sites of service, and how the technical component is defined for billing. The publication summarizes benchmark considerations for payers listed above, highlights coding context relevant to radiation oncology billing, and notes where input data were not provided.
What readers will learn: a clear definition of the service captured by CPT code 77423, the typical care setting and service type, and which major national payers are relevant to coverage and reimbursement discussions. Data not available in the input: specific payment benchmarks, associated taxonomies, ICD‑10 diagnoses, and related or companion codes.
Billing Code Overview
CPT code 77423 describes the technical component of high energy neutron radiation treatment delivered to one or more isocenters. An isocenter is the common focal point of all radiation beams; treatment may use coplanar or non‑coplanar beam geometry with blocking, wedges, and/or compensators.
Service Type: Radiation therapy — high energy neutron, technical component
Typical Site of Service: Hospital outpatient radiation oncology department or freestanding radiation oncology center
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with a locally advanced, radioresistant pelvic sarcoma is referred to radiation oncology for high-energy neutron beam therapy. After multidisciplinary tumor board review and CT/MRI-based simulation, the radiation therapist establishes one or more isocenters to target the gross tumor volume with conformal neutron fields using coplanar and non‑coplanar beam arrangements. Immobilization, CT simulation with contrast, and fusion to diagnostic imaging are performed. The physics team performs treatment planning including beam modeling, blocking, wedges or compensators as needed, and verifies dose distributions and machine parameters. On treatment days the radiation therapy technologist positions the patient, aligns to the designated isocenter(s) using imaging guidance, applies the blocking/compensators, and delivers the technical component of high‑energy neutron radiation as directed by the radiation oncologist. Typical visits include daily fractions over multiple sessions with physics checks, machine quality assurance, and documentation of delivered dose and any acute patient reactions. Billing uses the technical component code 77423 for delivery of high‑energy neutron treatment to one or more isocenters; the radiation oncologist may separately bill professional services or global codes as appropriate.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When billing only the physician's interpretation/planning separate from the technical delivery |