CPT code 61770 covers stereotactic, image-guided removal of a skull bone segment and insertion of a catheter or probe to place a radiation source within a brain lesion. The procedure enables precise, localized delivery of interstitial radiation (brachytherapy) for intracranial tumors or focal brain lesions, reducing exposure to surrounding healthy tissue. Nationally, this code represents an important neurosurgical technique for managing select brain neoplasms and recurrent lesions where targeted radiation is clinically indicated.

Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers can expect a concise review of what CPT code 61770 represents, typical sites of service, and the clinical context of image-guided intracranial radiation catheter placement. The publication also outlines billing and coding considerations relevant to this neurosurgical service, summarizes common modifiers used with the code, and highlights where data is not available in the input.

This document is intended for clinicians, billing professionals, and policy analysts seeking a national overview of the clinical purpose and billing context of CPT code 61770, along with pointers to operational and reimbursement-related issues that commonly arise with image-guided intracranial brachytherapy procedures.