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    v1.0.30
    OpenPayerBilling CodesClinical Treatment Planning (External and Internal Sources) for Radiation TreatmentCPT cpt-77293-4d-ct-respiration-correlated-simulation-for-radiation-planning
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    CPT 77293: 4D (respiration‑correlated) CT Simulation for Radiotherapy

    Medicare pays $280 on average nationally for this procedure.

    CPT code 77293 describes a respiration‑correlated or 4D CT simulation study performed in addition to a 3D radiotherapy plan or intensity‑modulated radiation therapy (IMRT) plan; the service is a simulation and imaging service used for planning motion‑managed external beam radiation therapy, typically performed in a radiation oncology department or imaging center to capture tumor and organ motion for incorporation into the radiotherapy plan.

    For related coverage guidance, see recent payer policy updates: Pediatric Neurodevelopmental and Autism Spectrum Disorder (ASD) Screening Corporate Medical Policy, Inhaled Nitric Oxide Therapy (for New Mexico Only), Inhaled Nitric Oxide Therapy (for North Carolina Only).

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    Clinical & Coding Specifications

    Clinical Context

    A 62-year-old patient with a newly diagnosed, centrally located non–small cell lung cancer is referred for definitive radiation therapy. The radiation oncology team plans an intensity–modulated radiation therapy (IMRT) course. Because the tumor exhibits significant motion with respiration on diagnostic imaging and the treatment target is in the thorax, a respiration–correlated (4D) CT simulation is performed in addition to the standard 3D/IMRT planning CT. During the visit the radiation therapist acquires a 4DCT while the patient breathes normally using an external respiratory monitoring device; images are reconstructed into multiple breathing-phase datasets and an internal target volume (ITV) is delineated by the radiation oncologist. The physics team uses the 4D dataset to account for motion during contouring and dose calculation, and the dosimetrist generates an IMRT plan that incorporates the motion information. The 4DCT simulation is billed in conjunction with the 3D/IMRT planning services to document that respiration–correlated imaging was performed to guide planning and motion management.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77292Therapeutic radiology simulation-aided field setting; complex RT simulation, including use of contrast materials and/or custom immobilizationOften performed as the base simulation service to which the 4DCT (77293) is added when respiratory motion must be assessed.
    77295Special simulation for stereotactic radiation therapy guidance (separate session)May be used for stereotactic cases where dedicated special simulation is performed in addition to motion-correlated imaging.
    77301Radiation treatment planning, complex (e.g., IMRT); plan, dosimetry, and documentationThe IMRT planning code represents the planning process that uses the 4DCT data to generate treatment fields and dose distributions.
    77334Special dosimetry (e.g., for intensity modulated radiotherapy)Used when advanced dosimetric measurements or verification are performed that utilize the 4DCT-derived plan.
    77014Computed tomography guidance for placement of radiation therapy fields (separate procedure)May be reported when CT guidance is used during setup or verification and is related to the 4D planning dataset.

    Related Modifiers

    9 rows

    ModifierDescriptionWhen to Use
    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…
    23Modifier -23 (Unusual Anesthesia) is used on anesthesia service CPT codes when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia…- Use modifier -23 only on anesthesia CPT codes (00100–01999) when a procedure that normally requires no anesthesia or only local anesthesia must be performed under general anesthesia because of…
    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…
    50Modifier –50 (Bilateral Procedure) is appended to a CPT code when an identical procedure is performed on paired anatomical structures during the same operative session. The AMA states to add…- Use modifier -50 when the same CPT surgical, diagnostic, or radiology procedure is performed on paired anatomical structures (both sides of the body) during the same operative/session by the same…
    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…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    174H00000X
    163WH0200X
    2472B0301X
    246Y00000X
    167G00000X
    2084P0805X
    224ZF0002X
    235Z00000X

    Related ICD-10-CM Codes

    28 rows

    ICD-10-CM CodeDescription
    C15.9Malignant neoplasm of esophagus, unspecified
    C18.9Malignant neoplasm of colon, unspecified
    C20Malignant neoplasm of rectum
    C22.0Liver cell carcinoma
    C25.9Malignant neoplasm of pancreas, unspecified
    C32.9Malignant neoplasm of larynx, unspecified
    C33Malignant neoplasm of trachea
    C34.11Malignant neoplasm of upper lobe, right bronchus or lung
    C34.31Malignant neoplasm of lower lobe, right bronchus or lung
    C34.81Malignant neoplasm of overlapping sites of right bronchus and lung

    Showing 1–10 of 28

    Related Payer Policy Updates

    Specialty: Pediatrics/Neonatology1 / 3

    10 rows

    PolicyPayerEffective Date
    Pediatric Neurodevelopmental and Autism Spectrum Disorder (ASD) Screening Corporate Medical Policybcbsvermont2026-12-01
    Inhaled Nitric Oxide Therapy (for New Mexico Only)UnitedHealthcare2026-10-01
    Inhaled Nitric Oxide Therapy (for North Carolina Only)UnitedHealthcare2026-10-01
    Inhaled Nitric Oxide Therapy (for Pennsylvania Only)UnitedHealthcare2026-10-01
    Inhaled Nitric Oxide Therapy (for Kentucky Only)UnitedHealthcare2026-10-01
    Clinical Policy: NICU Apnea Bradycardia GuidelinesAmbetter Nevada2026-10-01
    DRG Newborn Inpatient Stays - FacilityBlue Cross Blue Shield - Maine2026-10-01
    Pediatric Preventive ScreeningOscar Health2026-10-01
    Infant Nutritional FormulaCigna2026-09-15
    Pediatric Preventive ScreeningBlue Cross Blue Shield - New Mexico2026-09-04

    Related Codes

    CPT-77261-RADIATION-TREATMENT-PLANNING-INITIAL

    CPT 77261: Radiation Treatment Planning, Simple

    CPT-77262-RADIATION-THERAPY-TREATMENT-PLANNING-DETAILED

    CPT 77262: Radiation Therapy Treatment Planning and Management

    CPT-77263-RADIATION-THERAPY-TREATMENT-PLANNING

    CPT 77263: Complex Radiation Therapy Treatment Planning

    CPT-77280-RADIATION-THERAPY-SIMULATION-SIMPLE

    CPT 77280: Simple Radiation Therapy Simulation and Port Localization

    CPT-77285-RADIATION-THERAPY-SIMULATION-PORT-LOCALIZATION

    CPT 77285: Radiation Therapy Simulation for Port Localization

    CPT-77290-RADIATION-TREATMENT-SIMULATION-PLANNING

    CPT 77290: 3D Radiation Therapy Simulation and Treatment Field Localization

    CPT-77295-3D-DOSE-RECONSTRUCTION-VOLUMETRIC-DOSE-CALCULATION

    CPT 77295: 3D Dose Reconstruction and Volumetric Dose Calculation

    CPT-77299-THERAPEUTIC-RADIOLOGY-TREATMENT-PLANNING-UNLISTED

    CPT 77299: Therapeutic Radiology Clinical Treatment Planning

    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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