The reporting of new modifier –JW, which specifies the portion of a single dose vial (SDV) or single use package that was not administered to the patient, and which goes into effect July 30, 2010, is optional at this time.  

Medicare guidelines state to report the drug amount administered on one line, and on a separate line you may report the amount of drug NOT administered (wasted) with modifier –JW appended to the associated HCPCS code.

Within the listing of 2010 HCPCS posted by CMS on November 2nd laboratorians will see two new G-codes that redefine coding of qualitative drug analysis billed to Medicare.