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CPT 77772: High-Dose-Rate Interstitial or Intracavitary Brachytherapy, >12 Channels

CPT code 77772 identifies high-dose-rate (HDR) brachytherapy delivered via interstitial or intracavitary catheters using more than 12 channels, including preloading dose calculation when performed. This procedure is a specialized radiation oncology service for targeted tumor treatment and is significant nationally due to its role in organ-preserving cancer therapies and complex technical requirements. Payment and coverage for multi-channel HDR brachytherapy affect hospital radiation oncology departments and freestanding specialty centers.

Key payers examined include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, common billing practices, and the payer landscape relevant to CPT code 77772. The publication summarizes typical sites of service, relevant service definitions, and common modifiers and billing considerations where available.

The report also highlights benchmarks and policy-relevant updates that influence reimbursement and billing workflows for high-complexity brachytherapy, as well as operational implications for radiation oncology providers. Data not available in the input is noted where applicable.

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Billing Code Overview

CPT code 77772 describes a high-dose-rate interstitial or intracavitary brachytherapy procedure using more than 12 channels. The procedure involves placing one or more catheters either directly within cancerous tissue (interstitial) or within a body cavity (intracavitary) and loading them with a high-energy radioactive substance to treat tumors. The service includes the calculation of the radioactive dose prior to loading the catheters, when that calculation is performed as part of the service.

Service type: Brachytherapy procedure (high-dose-rate, multi-channel)
Typical site of service: Hospital inpatient or outpatient radiation oncology departments; freestanding radiation oncology centers

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CPT 77772: High-Dose-Rate Interstitial or Intracavitary Brachytherapy, >12 Channels

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Billing Code Overview

Service type: Brachytherapy procedure (high-dose-rate, multi-channel)
Typical site of service: Hospital inpatient or outpatient radiation oncology departments; freestanding radiation oncology centers

Clinical & Coding Specifications

Clinical Context

A 62-year-old female with locally advanced cervical cancer is scheduled for interstitial and intracavitary high-dose-rate (HDR) brachytherapy using a multi-channel applicator (>12 channels) following external beam radiation therapy. The patient arrives to the outpatient radiation oncology suite, is assessed for fitness for conscious sedation or general anesthesia, and informed consent is confirmed. Under anesthesia in the procedure room or operating room, the radiation oncologist and gynecologic oncologic team place intracavitary applicators and interstitial catheters into the tumor and parametrium, then obtain CT or MRI imaging for treatment planning. Medical physicists calculate dwell times and source loading (dose calculation) and load a high-energy radioactive source into the channels; treatment is delivered via remote afterloading. Post-treatment, applicators are removed, the patient is monitored for hemostasis and immediate complications, and discharge instructions are provided. Typical sites of service include the hospital outpatient department, ambulatory surgery center, or hospital operating room depending on anesthesia and institutional practice. The service type is image-guided interstitial/intracavitary high-dose-rate brachytherapy with multi-channel (>12) applicator placement and source loading including pre-loading dose calculation when performed.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when reporting the physician interpretation/planning portion separate from technical services.
`59`	Distinct procedural service	Use when a separate, distinct procedure is performed on the same day that is not ordinarily reported together.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons (co-surgery) during applicator placement.
`73`	Discontinued outpatient procedure prior to anesthesia administration	Use if procedure is discontinued before anesthesia is given.
`76`	Repeat procedure by same physician	Use when the same provider repeats the brachytherapy procedure later the same day.
`77`	Repeat procedure by another physician	Use when a different physician repeats the procedure the same day.
`78`	Return to the operating room for a related procedure during the postoperative period	Use if patient returns to OR for a complication related to the brachytherapy.
`80`	Assistant surgeon	Use when an assistant surgeon performs part of the operative work.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as originally planned.

Taxonomy Code	Specialty	Notes
2080P0208X	Radiation Oncology	Primary specialty performing HDR brachytherapy and treatment planning.
208000000X	Radiation Therapist	Performs treatment delivery and afterloader operation under supervision.
207L00000X	Gynecologic Oncology	Frequently involved when gynecologic tumors require interstitial catheter placement.
207P00000X	Surgical Oncology	May assist with applicator/catheter placement for complex tumors.
3336C0002X	Medical Physics	Physicists calculate dose, validate source loading, and ensure safety — clinical medical physicist taxonomy.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C53.9`	Malignant neoplasm of cervix uteri, unspecified	Common indication for intracavitary and interstitial HDR brachytherapy targeting cervical tumors.
`C61`	Malignant neoplasm of prostate	Prostate interstitial brachytherapy may require multi-channel applicators for complex implants.
`C54.9`	Malignant neoplasm of corpus uteri, unspecified	Endometrial or uterine body tumors occasionally treated with intracavitary/interstitial brachytherapy.
`C80.1`	Malignant (primary) neoplasm, unspecified	Used when a specific primary site is not coded but brachytherapy is indicated for malignancy.
`C76.2`	Malignant neoplasm of pelvic soft tissue	Pelvic soft tissue tumors that require interstitial catheter placement for local control.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`77778`	Remote afterloading high dose rate brachytherapy, complex, per fraction	Used to report the actual HDR afterloading treatment delivery per fraction when complex planning and multiple channels are used.
`77334`	Remote dosimetry calculation, brachytherapy source loading when performed	Reports treatment planning/dosimetry work when separate from procedural code; may be billed when detailed dosimetry is reported independently.
`57260`	Radiation therapy applicator placement, intrauterine, interstitial and/or vaginal	Represents surgical placement of gynecologic applicators and interstitial needles; often performed immediately prior to `77772`.
`51702`	Injection procedure for placement of a urethral catheter, if indicated	Occasionally performed concomitantly for urinary management in pelvic brachytherapy cases.
`99070`	Supplies and materials (e.g., drugs, trays)	Used to report non-covered supplies required during the brachytherapy procedure when not included in the primary code.

CPT 77750: Intratumoral Radioelement Infusion with Hospital Admission and Follow-up

CPT-77761-INTRACAVITARY-BRACHYTHERAPY-IMPLANT

CPT 77761: Intracavitary Brachytherapy Implant Placement

CPT-77762-BRACHYTHERAPY-INTRACAVITARY-INTERSTITIAL-IMPLANT

CPT 77762: Brachytherapy Implant with 5–10 Radioactive Sources

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

CPT 77763: Intracavitary Brachytherapy with Multiple Source Implants

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

CPT 77767: Surface Brachytherapy for Small Skin Tumor

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

CPT 77768: Surface Brachytherapy for Skin Tumors >2.0 cm or Multiple Lesions

CPT-77770-SINGLE-CHANNEL-BRACHYTHERAPY-CATHETER-PLACEMENT

CPT 77770: Single-Channel Brachytherapy Catheter Placement

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

CPT 77771: Multi-Channel Brachytherapy, Interstitial or Intracavitary

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

CPT 77778: Interstitial Brachytherapy with >10 Radioactive Sources

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

CPT 77789: Low–Dose–Rate Surface or Interstitial Brachytherapy

Showing 1–10 of 12

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when reporting the physician interpretation/planning portion separate from technical services.
`59`	Distinct procedural service	Use when a separate, distinct procedure is performed on the same day that is not ordinarily reported together.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons (co-surgery) during applicator placement.
`73`	Discontinued outpatient procedure prior to anesthesia administration	Use if procedure is discontinued before anesthesia is given.
`76`	Repeat procedure by same physician	Use when the same provider repeats the brachytherapy procedure later the same day.
`77`	Repeat procedure by another physician	Use when a different physician repeats the procedure the same day.
`78`	Return to the operating room for a related procedure during the postoperative period	Use if patient returns to OR for a complication related to the brachytherapy.
`80`	Assistant surgeon	Use when an assistant surgeon performs part of the operative work.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as originally planned.

Taxonomy Code	Specialty	Notes
2080P0208X	Radiation Oncology	Primary specialty performing HDR brachytherapy and treatment planning.
208000000X	Radiation Therapist	Performs treatment delivery and afterloader operation under supervision.
207L00000X	Gynecologic Oncology	Frequently involved when gynecologic tumors require interstitial catheter placement.
207P00000X	Surgical Oncology	May assist with applicator/catheter placement for complex tumors.
3336C0002X	Medical Physics	Physicists calculate dose, validate source loading, and ensure safety — clinical medical physicist taxonomy.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C53.9`	Malignant neoplasm of cervix uteri, unspecified	Common indication for intracavitary and interstitial HDR brachytherapy targeting cervical tumors.
`C61`	Malignant neoplasm of prostate	Prostate interstitial brachytherapy may require multi-channel applicators for complex implants.
`C54.9`	Malignant neoplasm of corpus uteri, unspecified	Endometrial or uterine body tumors occasionally treated with intracavitary/interstitial brachytherapy.
`C80.1`	Malignant (primary) neoplasm, unspecified	Used when a specific primary site is not coded but brachytherapy is indicated for malignancy.
`C76.2`	Malignant neoplasm of pelvic soft tissue	Pelvic soft tissue tumors that require interstitial catheter placement for local control.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`77778`	Remote afterloading high dose rate brachytherapy, complex, per fraction	Used to report the actual HDR afterloading treatment delivery per fraction when complex planning and multiple channels are used.
`77334`	Remote dosimetry calculation, brachytherapy source loading when performed	Reports treatment planning/dosimetry work when separate from procedural code; may be billed when detailed dosimetry is reported independently.
`57260`	Radiation therapy applicator placement, intrauterine, interstitial and/or vaginal	Represents surgical placement of gynecologic applicators and interstitial needles; often performed immediately prior to `77772`.
`51702`	Injection procedure for placement of a urethral catheter, if indicated	Occasionally performed concomitantly for urinary management in pelvic brachytherapy cases.
`99070`	Supplies and materials (e.g., drugs, trays)	Used to report non-covered supplies required during the brachytherapy procedure when not included in the primary code.

CPT 77750: Intratumoral Radioelement Infusion with Hospital Admission and Follow-up

CPT-77761-INTRACAVITARY-BRACHYTHERAPY-IMPLANT

CPT 77761: Intracavitary Brachytherapy Implant Placement

CPT-77762-BRACHYTHERAPY-INTRACAVITARY-INTERSTITIAL-IMPLANT

CPT 77762: Brachytherapy Implant with 5–10 Radioactive Sources

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

CPT 77763: Intracavitary Brachytherapy with Multiple Source Implants

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

CPT 77767: Surface Brachytherapy for Small Skin Tumor

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

CPT 77768: Surface Brachytherapy for Skin Tumors >2.0 cm or Multiple Lesions

CPT-77770-SINGLE-CHANNEL-BRACHYTHERAPY-CATHETER-PLACEMENT

CPT 77770: Single-Channel Brachytherapy Catheter Placement

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

CPT 77771: Multi-Channel Brachytherapy, Interstitial or Intracavitary

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

CPT 77778: Interstitial Brachytherapy with >10 Radioactive Sources

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

CPT 77789: Low–Dose–Rate Surface or Interstitial Brachytherapy

Showing 1–10 of 12

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

OpenPayer

CPT 77772: High-Dose-Rate Interstitial or Intracavitary Brachytherapy, >12 Channels

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Billing Code Overview

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CPT 77772: High-Dose-Rate Interstitial or Intracavitary Brachytherapy, >12 Channels

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Billing Code Overview

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References

Clinical & Coding Specifications

Clinical Context

Coding Specifications

Related Diagnoses

Related CPT Codes

Related Codes

References