CPT code 93598 identifies measurement of cardiac output performed during the same session as cardiac catheterization for congenital defects. This diagnostic physiologic procedure quantifies the volume of blood the heart pumps over time by injecting an indicator and measuring its concentration or temperature. The code is used in specialized invasive cardiology settings and supports clinical decision-making during congenital cardiac catheterization.

Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a national perspective on the clinical context and billing application of CPT code 93598, covering typical sites of service and how the procedure fits within congenital cardiac catheterization workflows.

Readers will learn the clinical purpose of the procedure, where it is typically performed, and the kinds of benchmarks and policy considerations commonly associated with invasive cardiac diagnostic services. Data elements not provided in the input (for example, specific reimbursement benchmarks, associated taxonomies, or ICD-10 diagnosis pairings) are noted as unavailable. The summary focuses on clarifying the code’s clinical meaning and relevance for payers and providers in national practice.