Billing -> Patient Account -> New Charges Tab ->More Info

or

Billing->Patient Account->Claims tab->Select claim from list->More Info

The More Info dialog consists of several tabs for additional visit information needed by payers to process claims. Many specialties require specific dates, certification numbers, etc. Additional information can be added by clicking on the appropriate tabs. The information entered here will be at the claim level and will apply to all charges within the claim. Unless this additional information is required by the payer for your specialty, do not add any additional information.

For charge level only information, you can add information in the Charge Details by double clicking on a specific charge in New Charges tab or when editing charges in the patient Claims tab.