CPT code 36558 covers the insertion of a central venous catheter (without a subcutaneous port or pump) into a major vein draining to the heart or directly into the right atrium for intravenous administration of medications, nutrition, or fluids in patients aged five years and older. This procedure is a key component of acute and chronic inpatient and outpatient care when reliable central venous access is required for therapies such as long-term intravenous antibiotics, parenteral nutrition, or vasoactive infusions. Nationally, the code matters because central venous access procedures are common, resource- and skill-intensive, and subject to payer-specific coverage policies and site-of-service distinctions that affect billing and care pathways.

Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and which payers are commonly involved. The publication summarizes benchmarking considerations, coding and billing nuances relevant to payer coverage, and policy updates that influence reimbursement and utilization management. Where input data is not provided, the publication notes that specific fields are unavailable and focuses on national-level implications for clinicians, billing professionals, and policy stakeholders.