Summary & Overview
CPT 77336: Ongoing Medical Physics Consultation
Headline: CPT code 77336: Weekly Medical Physics Consultation During Radiation Therapy
Lead: CPT code 77336 reports ongoing medical physics consultation provided while a patient receives a course of radiation therapy. The service is typically billed once per week after a full week of treatments and captures the medical physicist’s review of treatment documentation, dosimetry, and delivery issues.
What it represents and why it matters: CPT code 77336 designates the periodic, typically weekly, oversight performed by a medical physicist to ensure that radiation therapy is delivered according to the prescribed plan and safety standards. This code supports clinical quality assurance in radiation oncology and has implications for billing workflows, resource allocation, and documentation during multi-fraction treatment courses.
Key payers covered: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
What readers will learn: This publication provides benchmarks and billing guidance context for CPT code 77336, outlines common billing patterns and modifiers, and summarizes the clinical role of ongoing physics review during radiation treatment. It also presents typical sites of service and the operational cadence for weekly reporting after an established set of treatment sessions.
Policy and clinical context overview: The content focuses on national-level billing and clinical context for ongoing medical physics consultation, emphasizing the service’s role in treatment quality assurance and routine weekly documentation during multi-session radiation therapy.
Billing Code Overview
CPT code 77336 describes ongoing medical physics consultation provided during a course of radiation therapy. This service documents the medical physicist's weekly review of treatment delivery, assessment of treatment records, and evaluation of any physics- or dosimetry-related issues that arise while a patient receives a planned series of radiation treatments.
Service type: Medical physics consultation during radiation therapy.
Typical site of service: Radiation oncology department or other outpatient/inpatient setting where radiation therapy is delivered.
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with stage III non-small cell lung cancer receiving definitive external beam radiation therapy (daily fractions Monday–Friday) is scheduled for a 6-week course of treatment. After completion of each full week of therapy (generally five sessions), the medical physics team performs an ongoing physics consultation to review delivered dose, treatment records, machine log files, any deviations from the treatment plan, and to confirm continued accuracy of immobilization, image guidance, and treatment delivery parameters. The physics consult documents weekly chart checks, evaluates machine output and beam data as relevant, verifies any plan adjustments or adaptive decisions, and communicates findings to the radiation oncologist and therapy team. This service is reported once per week using 77336 for the period after a full week of fractions has been delivered, typically in an outpatient radiation oncology department or hospital-based radiation therapy suite.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting the professional component separate from technical services for physician/physicist interpretation or oversight |
59 |