Collection of consistently defined, classified data that describe the medical content of a patient’s bill. For acute-care and short-term facilities, UHDDS is required by the federal government for Medicare and Medicaid discharged patients. UHDDS contains the patient’s age, sex, and ICD-9-CM diagnoses and procedures. The Uniform Hospital Discharge Abstract is used to collect the UHDDS. Assignment to a diagnosis-related group (DRG) is made from this data set by a fiscal intermediary.