UnitedHealthcare and its Affiliates require the submission of the National Provider Identifier (NPI), and additionally request the submission of Tax Identification Number (TIN) and Health Care Provider. Taxonomy Code, on all UB-04 and CMS 1500 (08-05) paper and HIPAA 837 electronic claim. submissions. In addition to the HIPAA (Health Insurance Portability and Accountability Act) mandated requirement for NPI to be used in all HIPAA standard transactions; many Medicaid State.