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    OpenPayerBilling CodesStereotactic Radiation Treatment DeliveryCPT cpt-77373-stereotactic-body-radiation-therapy-technical-single-fraction
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    CPT 77373: Stereotactic Body Radiation Therapy, Technical Component

    Medicare pays $1025 on average nationally for this procedure.

    CPT code 77373 describes the technical component of stereotactic body radiation therapy (SBRT) delivered to small targets or lesions outside the brain and spinal cord using a three-dimensional coordinate system and externally generated ionizing radiation; this code covers a single fraction within a course of up to five fractions and represents a radiation oncology technical service typically provided in an outpatient radiation oncology clinic or hospital-based radiation therapy department.

    For related coverage guidance, see recent payer policy updates: Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM), Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®), Lumbar Microdiscectomy.

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    Table of contents

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult with one or a small number of extracranial, extracerebral solid tumor lesions (for example, a solitary lung metastasis or a primary early-stage non-small cell lung cancer) referred for stereotactic body radiation therapy (SBRT). The patient has completed multidisciplinary evaluation including diagnostic imaging (CT and/or PET) and tumor board review, and is ambulatory with Karnofsky performance status adequate for ablative radiation. The clinical workflow: consultation with a radiation oncologist, simulation with immobilization and high-resolution CT (often 4D-CT for thoracic lesions), image fusion with diagnostic CT/PET/MRI as needed, target and normal-structure delineation, treatment planning using a stereotactic plan and dose constraints, plan review and physics QA, and daily or fraction-specific image guidance for precise setup. Billing for the technical component of a single SBRT fraction is reported with 77373 for one of up to five fractions in the course. The technical services include delivery of stereotactic body radiation, image guidance and immobilization, and technical QA. Documentation typically includes treatment consent, simulation notes, target volumes, fractionation schedule, image guidance registrations, and machine parameters.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77295Special radiotherapy simulation, complexSimulation services (immobilization and simulation CT) performed prior to SBRT planning
    77301Stereotactic radiation treatment delivery, per session, for cranial targets (for comparison)Cranial stereotactic delivery code; contrasted with extracranial 77373 to indicate site-specific coding
    77334Technical radiation physics consultation, dosimetry, and treatment plan verificationPhysics/dosimetry work associated with SBRT plan development and QA
    77435Radiation treatment delivery, complex; management of radiotherapy procedures, per fractionGeneral complex external beam fraction delivery code that may be used for non-stereotactic complex treatments in the same course
    77014Computed tomography guidance for stereotactic radiation therapyCT image guidance or localization used during simulation or delivery associated with SBRT

    Related Modifiers

    7 rows

    ModifierDescriptionWhen to Use
    26Modifier 26 (Professional Component) identifies and bills only the professional portion of a split service — the physician’s interpretation, report, and medical judgment — when the technical…- Use CPT Modifier -26 when you are billing only the professional component (PC) of a split‑bill eligible service—i.e., you performed the physician interpretation, medical judgment and prepared a…
    59Modifier 59 indicates a distinct procedural service when two procedures that are not normally billed together are clinically and procedurally separate. The CPT definition (as reiterated by CMS)…- Use modifier -59 to report a distinct procedural service when documentation supports that the procedure reported is not normally billed together with another service on the same day because of a…
    76Modifier -76, Repeat Procedure or Service by Same Physician or Other Qualified Health Care Professional, is appended when the same provider performs an identical, medically necessary procedure or…- Use modifier -76 when the same physician or other qualified health care professional performs an identical procedure or service a second (or subsequent) time on the same date of service and the…
    78CPT modifier -78 indicates an unplanned, related return to the operating or procedure room by the same provider during the global postoperative period. It is appended when treatment for a…- Use modifier -78 when an unplanned, related complication during the original procedure’s global postoperative period requires the patient to return to a formal operating or procedure room and the…
    52Modifier ‑52 (Reduced Services) indicates that a service or procedure was partially reduced or omitted at the provider’s discretion, allowing reporting of the basic procedure number with a qualifier…- Use modifier -52 when a physician or qualified health professional electively reduces or omits part of a procedure or service (for example, performing fewer required views or omitting a portion of…
    53Modifier 53 (Discontinued Procedure) signals that a surgical or diagnostic service was begun by the physician but terminated because of extenuating circumstances that threatened the patient’s…- Use modifier -53 when a physician/qualified healthcare professional has started a surgical or diagnostic procedure (e.g., anesthesia administered, incision or scope insertion) and then discontinues…
    22Modifier –22 (Increased Procedural Services) is used when a reported procedure is substantially more extensive than normally required. The CPT Manual and CMS state it may be appended only when the…- When to use: Append modifier -22 to a procedural CPT code when the service performed is substantially more extensive than the usual service described by that code — i.e., the procedure required…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    2084P0800X
    364SC2300X
    1744P3200X
    156FX1100X
    261QP0904X
    163WW0101X
    207PP0204X
    207YX0602X

    Related Payer Policy Updates

    Specialty: Neurology/Neurosurgery1 / 3

    10 rows

    PolicyPayerEffective Date
    Clinical Review Criteria Intraoperative Neurophysiological Monitoring (IONM)Kaiser Permanente2027-01-01
    Remote Electrical Neuromodulation for Migraines (i.e., Nerivio®)bcbsvermont2026-11-01
    Lumbar Microdiscectomyuniverahealthcare2026-10-15
    Artificial Cervical Intervertebral Discuniverahealthcare2026-10-15
    Lumbar Decompressionuniverahealthcare2026-10-15
    Responsive Neurostimulation for Focal EpilepsyPremera Bluecross2026-10-14
    Intraoperative MonitoringProvidence Health Plan2026-10-01
    Intraoperative MonitoringProvidence Health Plan2026-10-01
    High-Intensity Focused UltrasoundMass General Brigham Health Plan2026-10-01
    Vagal Nerve StimulationAmbetter Nevada2026-10-01

    Related Codes

    CPT-77371-STEREOTACTIC-RADIOSURGERY-TECHNICAL-COBALT-60

    CPT 77371: Stereotactic Radiosurgery Technical Component

    CPT-77372-STEREOTACTIC-RADIOSURGERY-TECHNICAL-COMPONENT

    CPT 77372: Stereotactic Radiosurgery, Technical Component

    CPT-77387-IMAGE-GUIDANCE-RADIATION-THERAPY-TARGETING

    CPT 77387: Image Guidance for Radiation Target Localization

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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