CPT code 36010 represents central venous catheterization of the superior or inferior vena cava used to deliver medications or to perform cardiac vascular procedures such as angiography, venography, or angioplasty. Nationally, this code captures a high-acuity, procedure-based service performed in hospital settings and cardiac catheterization laboratories and is relevant for facility and professional billing workflows, utilization monitoring, and quality reporting. Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of clinical intent and typical sites of service, an overview of common payer coverage considerations, and context for how 36010 fits into procedural coding families for cardiovascular interventions. The publication outlines common modifiers and billing practices used in conjunction with this code and highlights areas where coding clarity impacts reimbursement and compliance. Data not available in the input is noted where applicable. This resource is intended for billing professionals, practice managers, and policy analysts seeking a national-level reference for clinical description, payer scope, and the billing context surrounding CPT code 36010.