Provider Credentialing or Primary Source Verification is the process of organizing and verifying a provider’s professional records. Their NPI, professional licenses, diplomas, certifications, attestations and professional references make up a provider’s professional credentialing file. This process is completed every 2-3 years depending upon an organization’s accreditation status. The process of credentialing is to verify the accuracy and specific data in a provider’s documents as required by different accrediting entities.