TMPPM 2010 > Volume 1, General Information > Section 1: Provider Enrollment and Responsibilities > Provider Enrollment > National Provider Identifier (NPI) and Taxonomy Codes


1.1.1 National Provider Identifier (NPI) and Taxonomy Codes

The National Provider Identifier (NPI) final rule, Federal Register 45, Code of Federal Regulations (CFR) Part 162, established the NPI as the standard unique identifier for health-care providers and requires covered health-care providers, clearinghouses, and health plans to use this identifier in Health Insurance Portability and Accountability Act (HIPAA)-covered transactions. An NPI is a 10-digit number assigned randomly by the National Plan and Provider Enumeration System (NPPES).

The Health Care Provider Taxonomy Code Set is an external, non-medical collection of alphanumeric codes designed to classify health-care providers by provider type and specialty. Providers may have more than one taxonomy code. (Taxonomy codes can be obtained from the Washington Publishing Company website at

During the enrollment process, providers must select a primary and, if applicable, secondary taxonomy code associated with their provider type. Providers will be supplied a list of taxonomy codes to choose from that correspond to the services rendered by the type of provider they wish to enroll as. Only the code will be displayed. Due to copyright laws, TMHP is unable to publish the taxonomy description. Therefore, providers must verify the taxonomy code associated with their provider type and specialty before beginning the online attestation process.

Initial Texas Medicaid fee-for-service enrollment and reenrollment can be completed online. This includes the Texas Health Steps (THSteps) program for both medical and dental providers and case management for Children and Pregnant Women (CPW). A link to the provider enrollment application is provided on the TMHP website homepage at

Texas Medicaid & Healthcare Partnership
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