Ten-character alphanumeric provider specialty codes that are assigned and classify each health care provider (e.g., general practice 208D0000X). These codes are maintained and distributed by the Centers for Medicare and Medicaid Services (CMS) and used when transmitting electronic insurance claims. A given provider can have several provider taxonomy codes. This code set is used in theX12 278 Referral Certification and Authorization and the X12 837 claim transactions and is maintained by the National Uniform Claim Committee (NUCC).