In anticipation of the availability of a vaccine for the H1N1 virus in the fall of 2009, the Centers for Medicare & Medicaid Services (CMS) created two new HCPCS Codes for the vaccine itself (G9142), which is not payable by Medicare as it will be supplied at no cost, and for the administration (G9141), which is payable. The effective date of G9142 and G9141 is September 1, 2009.