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    v1.0.30
    OpenPayerBilling CodesRadiation Treatment DeliveryCPT cpt-77417-therapeutic-radiology-port-films
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    CPT 77417: Therapeutic Radiology Port Films

    CPT code 77417 describes therapeutic radiology port films, the X‑ray images typically taken by a radiation therapist to document and verify the treatment area; service type: radiation therapy imaging / setup verification; typical site of service: radiation oncology department or hospital outpatient radiology area.

    For related coverage guidance, see recent payer policy updates: Radiation oncology coverage and treatment delivery guidelines, Proton Beam Therapy, Radiation and Oncologic Procedures.

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    Table of contents

    Progress1 / 6

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is an adult undergoing external beam radiation therapy for a localized malignancy (for example, breast, prostate, or head and neck cancer). Prior to simulation and on-treatment sessions, the radiation therapist obtains 77417 therapeutic radiology port films to verify patient positioning, field placement, and immobilization devices. The workflow begins with patient check-in and positioning in the treatment suite using immobilization (thermoplastic masks, breast boards, or leg supports). The therapist aligns external marks or laser localization, captures anterior/posterior and/or lateral port films with the treatment unit or dedicated simulator, and reviews images against the planned radiation fields. If discrepancies are identified, the therapist documents adjustments and may repeat imaging. The images are archived in the radiation oncology record and used for daily setup verification or special checks when deviations or complex setups occur. Typical site of service is an outpatient radiation oncology department or hospital-based radiation therapy unit.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77295Simulation of intensity-modulated radiotherapy plan, including device construction and documentation; simple or complex (per course of treatment)Performed prior to treatment; simulation defines fields that 77417 port films verify at treatment setup.
    77301Radiation treatment delivery, simple/complex; superficial, extended, or conformal planning (per fraction) — source-specific codes varyRepresents planning and delivery services that are followed by port films for setup verification.
    77401Radiation therapy management, for preparation and guidance (portal verification)Portal verification codes related to 77417; used for management and review of port films and field verification.
    77014Radiography; guidance for localization of target organ/structure for radiotherapy (portal localization)Diagnostic or localization radiographs that may accompany or complement 77417 port films during setup.
    77418Therapeutic radiology port films, per film (if additional documentation or specific billing unit is required)Related port film code sometimes used to report additional views or specific billing conventions in combination with 77417.

    Related Modifiers

    8 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…
    77Modifier 77 indicates that a previously performed procedure or service was legitimately repeated by a different physician or other qualified health care professional. The AMA’s CPT definition…- Use modifier 77 when a basic procedure or service already performed is repeated by a different physician or other qualified health care professional (for example, a second provider independently…
    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…
    25CPT modifier 25 indicates that on the same day as another procedure or service, the same physician or other qualified health care professional provided a significant, separately identifiable…- When to apply: Use modifier 25 only on an E/M code to indicate the same provider delivered a significant, separately identifiable E/M service on the same day as another procedure or service — i.e.,…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    174400000X
    207RC0000X
    2085R0204X
    207ND0101X
    1041C0700X
    225CX0006X
    2084P0015X
    224P00000X

    Related Payer Policy Updates

    Specialty: Radiation Oncology1 / 2

    10 rows

    PolicyPayerEffective Date
    Radiation oncology coverage and treatment delivery guidelinesevicore2026-11-05
    Proton Beam Therapyuniversityofutahhealthplans2026-10-25
    Radiation and Oncologic ProceduresUnitedHealthcare2026-09-01
    Electronic Brachytherapy for Nonmelanoma Skin CancerBluecross Idaho2026-07-30
    Surface Radiation Therapy for Treatment of Non-Melanoma Skin Cancereocco2026-07-09
    Radiofrequency Ablation of Tumors Outside the LiverProvidence Health Plan2026-07-01
    Therapeutic Radiopharmaceuticals in Oncology (Lutathera, Pluvicto, Xofigo) Coverage CriteriaBlue Cross Blue Shield - North Carolina2026-07-01
    Intensity Modulated Radiation TherapyAmbetter Georgia2026-06-01
    Irreversible Electroporation (IRE) of Tumors Other Than LiverBlue Cross Blue Shield - Rhode Island2026-06-01
    Irreversible Electroporation (IRE) — NanoKnife (Preauthorization Required)Blue Cross Blue Shield - Nebraska2026-06-01

    Related Codes

    CPT-77402-EXTERNAL-BEAM-RADIATION-THERAPY-LEVEL-1

    CPT 77402: External Beam Radiation Therapy, Level 1 Complexity

    CPT-77407-3D-CRT-IMRT-SINGLE-ISOCENTER-LEVEL-2

    CPT 77407: Radiation Therapy, Level 2 Complexity

    CPT-77412-EXTERNAL-BEAM-RADIATION-THERAPY-HIGH-COMPLEXITY

    CPT 77412: Complex External Beam Radiation Delivery

    CPT-77424-INTRAOPERATIVE-RADIATION-THERAPY-TECHNICAL-COMPONENT

    CPT 77424: Intraoperative Radiation Therapy, Technical Component

    CPT-77425-INTRAOPERATIVE-ELECTRON-BEAM-RADIATION-TECHNICAL

    CPT 77425: Intraoperative Electron Beam Therapy, Technical Component

    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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