Final answer:
The UB-04 flat file is a series of fixed-length records used to bill institutional services, such as services performed in hospitals.
Step-by-step explanation:
The series of fixed-length records used to bill institutional services, such as services performed in hospitals, is known as the UB-04 flat file. The UB-04 is a standardized form that contains specific codes and information about the services provided to a patient at a facility, including diagnosis, procedures, and charges. It is used by hospitals, nursing homes, and other institutional providers to bill for their services.
Learn more about UB-04 flat file for billing institutional services