CPT code 19030 designates injection of contrast into the mammary ducts to perform a mammary ductogram or galactogram, a diagnostic breast imaging procedure used to evaluate ductal anatomy and identify intraductal pathology. The code is relevant nationally for radiology and breast specialty practices involved in diagnostic workup of nipple discharge or suspected ductal lesions. The analysis covers common national payers including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find concise clinical context for when this procedure is used, typical sites of service, and what to expect in payer coverage discussions. The publication summarizes available benchmarks and policy considerations where present, highlights coding and billing themes, and outlines areas where additional documentation or imaging correlation is commonly required. Data not available in the input is noted where applicable. This resource is intended to help payers, providers, and coding professionals understand the clinical role of CPT code 19030 and the administrative topics that frequently accompany this service.