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    v1.0.30
    OpenPayerBilling CodesClinical Brachytherapy Radiation TreatmentCPT cpt-77770-single-channel-brachytherapy-catheter-placement
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    CPT 77770: Single-Channel Interstitial or Intracavitary Brachytherapy

    Medicare pays $243 on average nationally for this procedure.

    CPT code 77770 describes single-channel brachytherapy in which a catheter is placed interstitially (within tumor tissue) or intracavitarily (within a body cavity) and loaded with a high-energy radioactive source to treat tumors; the service includes preloading radiation dose calculation when performed and is typically delivered as a procedural radiation oncology service in an operating room, procedure suite, or radiation oncology clinic setting.

    For related coverage guidance, see recent payer policy updates: Percutaneous Electrical Nerve Field Stimulation for Functional Abdominal Pain Disorders, Esophagogastroduodenoscopy (EGD) Coverage Policy, Radiofrequency Therapy for Fecal Incontinence.

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    Table of contents

    Progress1 / 7

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    Clinical & Coding Specifications

    Clinical Context

    A typical patient is a 65-year-old female with recurrent locally advanced cervical cancer localized to the vaginal cuff after prior external beam radiotherapy, now presenting for brachytherapy. The radiation oncology team schedules an intracavitary single-channel high-dose-rate (HDR) brachytherapy insertion using a vaginal tandem or cylinder. Pre-procedure workflow includes patient consent, review of prior imaging (MRI or CT), treatment planning with dose calculation, and sedation or monitored anesthesia care. In the procedural suite, the radiation oncologist inserts the single lumen applicator/catheter into the intracavitary position, verifies placement with fluoroscopy or CT, performs dosimetry calculations, loads the high-energy radioisotope temporarily into the single channel, delivers the planned dwell times, then unloads and removes the applicator. Post-procedure monitoring includes vital signs, discharge instructions, and scheduling of any subsequent fractions or follow-up imaging.

    Related CPT Codes

    CPT CodeDescriptionRelationship to This Procedure
    77295Therapeutic radiology simulation-aided field setup and or 3D planning with dose-volume histograms for brachytherapy (complex)Used for 3D treatment planning and dosimetric calculations prior to HDR single-channel brachytherapy.
    77336Continuing medical physics consultation, treatment device check, review of treatment plan and chart including assessment of dose delivered for complex or special proceduresUsed for physics review and verification of brachytherapy plan and delivered dose.
    Radiation Oncology CPTsData not available in the input.Data not available in the input.
    54160Implantation of temporary intracavitary radioactive source into the vagina for therapy (note: example code for similar procedures)Performed in some coding systems as anatomic-specific intracavitary implantation; relates conceptually to intracavitary HDR placement.

    Related Modifiers

    10 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…
    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…
    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…
    73Modifier 73 indicates a facility-level outpatient hospital or ASC procedure that was discontinued after the patient was prepared and taken to the procedure/operating room but before any anesthesia…- When to use: Apply CPT modifier 73 on the FACILITY (outpatient hospital or ASC) claim when the patient has been fully prepared and physically taken into the procedure/operating room but the…
    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…
    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…
    62Modifier 62 indicates that two surgeons function as co‑surgeons, each performing distinct parts of the same primary surgical procedure. It is appended to the primary procedure code (and any…- Use modifier -62 when two surgeons act as co‑surgeons (both primary surgeons) on a single definitive primary procedure, each performing distinct parts of the same surgical procedure (append -62 to…
    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…

    Related Provider Taxonomies

    8 rows

    Taxonomy Code
    207RH0000X
    207L00000X
    2084P0800X
    261QP2400X
    1223X0008X
    1041C0700X
    126900000X
    103TM1700X

    Related ICD-10-CM Codes

    28 rows

    ICD-10-CM CodeDescription
    C18.9Malignant neoplasm of colon, unspecified
    C20Malignant neoplasm of rectum
    C22.0Liver cell carcinoma
    C25.9Malignant neoplasm of pancreas, unspecified
    C33Malignant neoplasm of trachea
    C34.90Malignant neoplasm of unspecified part of unspecified bronchus or lung
    C41.9Malignant neoplasm of bone and articular cartilage, unspecified
    C43.9Malignant melanoma of skin, unspecified
    C44.91Basal cell carcinoma of skin, unspecified
    C49.9Malignant neoplasm of connective and soft tissue, unspecified

    Showing 1–10 of 28

    Related Payer Policy Updates

    Specialty: Gastroenterology1 / 3

    10 rows

    PolicyPayerEffective Date
    Percutaneous Electrical Nerve Field Stimulation for Functional Abdominal Pain Disordersbcbsvermont2026-12-01
    Esophagogastroduodenoscopy (EGD) Coverage Policyevicore2026-11-05
    Radiofrequency Therapy for Fecal IncontinenceCigna2026-10-15
    Magnetic Sphincter Augmentation for the Treatment of Gastroesophageal Reflux Disease (GERD)univerahealthcare2026-10-15
    High-Resolution Anoscopy (HRA)Premera Bluecross2026-10-01
    Gastroesophageal and Gastrointestinal (GI) Services and ProceduresColorado Rocky Mountain Health Plans2026-10-01
    Serum Testing for Hepatic Fibrosis in the Evaluation and Monitoring of Chronic Liver DiseaseOscar Health2026-10-01
    Fecal Analysis in the Diagnosis of Intestinal Dysbiosis and Fecal Microbiota Transplant TestingOscar Health2026-10-01
    Pancreatic Enzyme Testing for Acute PancreatitisOscar Health2026-10-01
    Helicobacter pylori TestingOscar Health2026-10-01

    Related Codes

    CPT-77750-INTRATUMORAL-RADIOELEMENT-INFUSION-HOSPITAL-ADMISSION-FOLLOW-UP

    CPT 77750: Radioelement Instillation to Destroy Tumor Cells

    CPT-77761-INTRACAVITARY-BRACHYTHERAPY-IMPLANT

    CPT 77761: Intracavitary Brachytherapy, 1–4 Sources

    CPT-77762-BRACHYTHERAPY-INTRACAVITARY-INTERSTITIAL-IMPLANT

    CPT 77762: Intracavitary Brachytherapy with 5–10 Sources

    CPT-77763-INTRACAVITARY-BRACHYTHERAPY-MULTI-SOURCE-IMPLANTATION

    CPT 77763: Intracavitary Brachytherapy, >10 Radioactive Sources

    CPT-77767-SURFACE-BRACHYTHERAPY-SKIN-TUMOR-SMALL-LESION

    CPT 77767: High-Dose-Rate Brachytherapy for Skin Tumor ≤2.0 cm

    CPT-77768-SURFACE-BRACHYTHERAPY-SKIN-TUMOR-LARGE-OR-MULTIPLE-LESIONS

    CPT 77768: Surface Brachytherapy for Skin Tumor >2.0 cm

    CPT-77771-BRACHYTHERAPY-INTERSTITIAL-INTRACAVITARY-MULTI-CHANNEL

    CPT 77771: Interstitial or Intracavitary Brachytherapy, 2–12 Channels

    CPT-77772-HIGH-DOSE-RATE-MULTI-CHANNEL-BRACHYTHERAPY

    CPT 77772: Interstitial or Intracavitary Brachytherapy, >12 Channels

    CPT-77778-INTERSTITIAL-BRACHYTHERAPY-MORE-THAN-10-SOURCES

    CPT 77778: Interstitial Brachytherapy, >10 Radioactive Sources

    CPT-77789-LOW-DOSE-RATE-SURFACE-BRACHYTHERAPY

    CPT 77789: Low–Dose–Rate Surface Brachytherapy

    Showing 1–10 of 12

    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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