Pharmacy personnel billing patients for services rendered is discussed. Billing for services is a critical function for maintaining the financial viability of health care institutions. Poor understanding of the system can lead to incorrect documentation, which can result in a claim rejection. The UB-92 provides hospitals with the proper format to request reimbursement for services provided. To ensure proper reimbursement, appropriate coding of International Classification of Diseases, 9th Revision, Clinical Modification (ICD-9-CM) codes for diagnosis, procedures, and services provided is necessary. Ancillary services, such as pharmacy, play a crucial role in the completion of the bill by ensuring that the charge-master accurately represents the service provided. This information includes identification, charge, cost, and revenue codes. Hospital billing agents must also account for any outpatient visits that may have occurred within three days of admission, since these charges may need to be included on the hospital bill. In order for the billing process to be effective, it is important that all personnel have a thorough understanding of the billing process and be able to effectively communicate with each other.