CPT code 86336 represents a laboratory assay for inhibin A used in prenatal serum screening to estimate fetal risk for Down syndrome. As part of multi-marker maternal screening protocols, this test contributes clinical information that can influence follow-up diagnostic decisions and prenatal care planning. Nationally, prenatal screening tests like the inhibin A assay are routinely ordered across obstetrics practices and clinical laboratories and are a common component of second-trimester aneuploidy risk assessment.

Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Coverage policies for prenatal screening vary by payer, with differences in approved indications, bundled panels versus standalone testing, and prior authorization requirements. This publication provides a concise overview of billing and clinical context for the code and highlights the operational aspects relevant to laboratories and obstetrics providers.

Readers will find: a clear description of the service represented by CPT code 86336; typical sites of service and specimen collection procedure; a summary of payer coverage landscape and common billing modifiers; and guidance on where to find additional policy detail. Data not available in the input is noted where applicable.