CPT code 36591 identifies collection of a blood specimen from a completely implantable venous access device that the same provider placed in a prior procedure. The service is commonly used when patients have long-term implanted ports for chemotherapy, long-term antibiotics, or frequent laboratory monitoring. Nationally, this code captures an important, low-complexity outpatient procedure tied to chronic and cancer care pathways where reliable vascular access is required.

Key payers covered in this review include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The analysis addresses how these payers typically classify and reimburse port-access specimen collection, common service settings, and billing considerations relevant to institutional and professional claims.

Readers will learn the clinical context for use of CPT code 36591, expectations for typical sites of service (ambulatory surgical centers, hospital outpatient departments, and physician offices), and the operational relevance for practices managing implanted venous access devices. The publication also summarizes available benchmarks and recent policy updates where applicable, and highlights documentation elements and coding scenarios that commonly affect claim adjudication. Data not available in the input is noted where specific payer rates, taxonomies, or ICD-10 pairings are not provided.