CMS is updating the status of the following two codes on the Clinical Laboratory Fee Schedule (CLFS), effective April 1, 2011:
- HCPCS code G0431QW is deleted from the CLFS. HCPCS code G0431 describes a high-complexity test and should not be reported with a QW modifier (QW modifier indicates a Clinical Laboratory Improvement Amendments of 1998 (CLIA)-waived test).
- HCPCS code G0434QW is added to the CLFS. HCPCS code G0434 can describe a CLIA waived test. The use of the QW modifier to indicate a CLIA-waived test is necessary for accurate claims processing.
- HCPCS codes G0431 and G0434 will remain on the CLFS.
