Immunoassay for Tumor Antigen: Diagnosis Code Range Expansion

Effective for dates of service on or after May 1, 2010, the diagnosis code range for CPT code 86304 (immunoassay for tumor antigen, quantitative, CA 125) has been expanded to include ICD-9-CM diagnosis codes 233.0 – 233.39. Providers are reminded to always bill to highest specificity.