Immunoassay No Longer a CLIA-Waived Test

Effective for dates of service on or after May 1, 2010, CPT code 83518 (immunoassay for analyte other than infectious agent antibody or infectious agent antigen, qualitative or semiquantitative; single step method [eg, reagent strip]) is no longer considered a Clinical Laboratory Improvement Amendments (CLIA)-waived test. Therefore, providers can no longer bill code 83518 with a QW modifier (a kit is being used).