Billing and Coding: Stereotactic Radiation Therapy: Stereotactic Radiosurgery (SRS) and Stereotactic Body Radiation Therapy (SBRT)

This billing and coding guidance clarifies that SRS is typically a single-session procedure and multi-fraction treatments must be billed as SBRT; claims must include a valid, specific ICD-10-CM diagnosis code. Documentation supporting medical necessity, treatment frequency, anatomy criticality, Karnofsky Performance Status, treatment dates and doses must be retained and provided on request; specific limits apply to reimbursement frequency (e.g., CPT 77373/G0339/G0340 once per day; CPT 77435 once per course) and to complex treatment device units (CPT 77334 limited to one unit per collimator/helmet, with additional units requiring justification).

"Stereotactic radiosurgery (SRS) is typically furnished as a single session; when more than one session is required, bill using stereotactic body radiation therapy (SBRT) codes instead of SRS codes."

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