National Institute of Governmental Purchasing Codes (NIGP Codes)
NIGP Codes Mapping to GL Accounts Resource Spreadsheet
Detailed information about this resource spreadsheet is available here. Please note that column E, which is described in the document linked in the preceding sentence, no longer appears in the resource spreadsheet. It was removed when the spreadsheet was finalized because it was no longer needed, as all NIGP Codes have been reviewed.