Uniform Billing, version 04 (UB-04) Certification Practice Test

Form Locators on UB-04 identify where each data item goes on the claim. The field used to carry the Treatment Authorization Code is Form Locator 63, so TACs are entered in FL63. This code shows that a payer has pre-approved the treatment, helping ensure proper adjudication. If no authorization is required, FL63 would be left blank.