Regarding State Drug Utilization Data (SDUD), is there an official crosswalk of National Drug Code (NDC) and Healthcare Common Procedure Coding System (HCPCS) codes which providers can use?

The drug utilization data that states report to CMS is reported at the NDC level. Therefore, for purposes of the Medicaid Drug Rebate Program (MDRP), crosswalk from HCPCS code to NDC should have already occurred prior to the states reporting their drug utilization data to CMS. Medicare Part B does post a HCPCS to NDC crosswalk ; however, please note that the subset of drugs covered under Part B is much smaller than  the drugs covered under the MDRP. Therefore, you may not find this crosswalk to be all-inclusive of every product covered under the MDRP.