The NDC/HCPCS crosswalk file provides a list of National Drug Codes (NDC) that are assigned to a Level II HCPCS along with conversion factors that are used to price the applicable billings to allow processing of claims filed using the NCPDP format.
The Pricing, Data Analysis and Coding (PDAC) updates the file monthly to add, revise or delete NDCs as published by Redbook. The file provides all prior updates, along with details on the changes that occurred in that month.
The PDAC only adds and updates the NDC/HCPCS that are billable to the Durable Medical Equipment Medicare Administrative Contractor (DMEMACs). Prior to the effective PDAC contract date of August 2008, all NDCs were updated. While these are still listed on the crosswalk file, they are not updated as changes are reported in Redbook.
The NDC/HCPCS Date Changes dataset provides a list of dates related changes The NDC/HCPCS crosswalk file.