Rebreathing of Inert Gas for Measurement of Cardiac Output and Validation of Intra-Cardiac Shunt

Rebreathing of inert gas for measuring cardiac output, predicting survival in pulmonary hypertension, or validating intra‑cardiac shunt is considered experimental/investigational and not covered because effectiveness has not been established. It is explicitly noted as not covered for ICD‑10 codes I27.0, I27.20‑I27.29 and Q21.0‑Q21.9, and no specific CPT/HCPCS codes are assigned in this policy.

"Rebreathing of inert gas for the measurement of cardiac output is considered experimental and investigational because the effectiveness has not been established."

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