These codes are used with the electronic exchange of data between providers, health plans, clearinghouses and other health care business associates. UnitedHealthcare National Accounts conducts the following transactions for which a National Provider Identifier has been adopted:

• Professional claims and institutional claims
• Eligibility (inquiry & response)
• Claim status (request & response)
• Enrollment and disenrollment
• Claim payment and remittance advice
• Premium payments
• Referral, certification and authorization (request and response)

We require our business partners to test with us before converting to the HIPAA standard transactions. If submissions are made to a clearinghouse, testing should be arranged with the clearinghouse. Entities that submit directly to us have been contacted to arrange testing.