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Rebreathing of Inert Gas for Measurement of Cardiac Output and Validation of Intra-Cardiac Shunt (CPB 0714, reviewed 2026-10-20)
Effective date
Not stated in the notice
Identified
Oct 26, 2026
Summary
Aetna clinical policy bulletin 0714, last reviewed October 20, 2026, covers rebreathing of inert gas for measuring cardiac output and for validating intra-cardiac shunt. The policy considers three uses experimental, investigational or unproven because their effectiveness has not been established: measuring cardiac output, predicting survival in persons with pulmonary hypertension, and validating intra-cardiac shunt.
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What to do
Action · 3 steps
01Billing team: do not bill rebreathing of inert gas for measurement of cardiac output, for prediction of survival in persons with pulmonary hypertension, or for validation of intra-cardiac shunt, because the policy considers each of these experimental, investigational or unproven.
02The policy lists no specific CPT or HCPCS codes for these uses.
03It also lists ICD-10 codes I27.0 and I27.20 through I27.29 (pulmonary hypertension) and Q21.0 through Q21.9 (congenital malformations of cardiac septa, intra cardiac shunt) as not covered for the indications it lists.
Codes mentioned
I27.0I27.20I27.29Q21.0Q21.9
Original notice
Rebreathing of Inert Gas for Measurement of Cardiac Output and Validation of Intra-Cardiac Shunt (CPB 0714, reviewed 2026-10-20)
aetna.com · Always check the source before changing claims.
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