how many digits is a medicaid legacy number?
Medicaid Number on the new forms? Yes, until May 22, 2007. All claims received before May 23, 2007 must include the 9-digit Provider Medicaid Number (Legacy ID). Can I enter my NPI/API on claims before May 23, 2007? Yes, you may enter it if available, however, the 9-digit Provider Medicaid Number will be used to process all claims received before May 23, 2007. When is my NPI/API required on claims? May 23, 2007. Per HIPAA, the Centers for Medicare and Medicaid Services