Code NumberDescriptionCPT-483519Immunoassay for analyte other than infectious agent antibody or infectious agent antigen; quantitative, by radioimmunoassay (eg, RIA) 83520 Immunoassay for analyte other than infectious agent antibody or infectious agent antigen; quantitative, not otherwise specified84182 Protein; Western Blot, with interpretation and report, blood or other body fluid, immunological