CLIA-Waived Laboratory Code Updates

Effective for dates of service on or after February 1, 2010, CPT code 84155 (protein, total, except by refractometry; serum, plasma or whole blood) is Clinical Laboratory Improvement Amendments (CLIA)-waived when performed with a CLIA-waived test kit. It must be billed with modifier QW to signify that the kit was used. For dates of service on or after January 1, 2010, CPT code 84157 (protein, total, except by refractometry; other source ) may no longer be billed with modifier QW.

Source: January 2010 – Bulletin 427