CPT code 86304 describes a quantitative laboratory assay to measure the cancer tumor antigen CA 125 in serum or other body fluids, used to evaluate and monitor tumor marker levels associated with pancreatic and other malignancies; service type: quantitative laboratory test; typical site of service: clinical laboratory or hospital laboratory.

For related coverage guidance, see recent payer policy updates: Diagnosis of Idiopathic Environmental Intolerance, Allergen Testing, Allergen Testing.