What is Primary Source Verification in Credentialing?

Primary source verification means confirming credentials directly with the original issuing organization rather than relying on copies or attestations. Credentialing entities verify medical school graduation with the school itself, board certifications with specialty boards, licenses with state boards, and DEA registration with the federal DEA database. Work history is confirmed with previous employers. This direct verification prevents fraud and ensures accuracy but takes time, often contributing to long credentialing timelines. Providers cannot expedite primary source verification timelines.