The month, day, and year the patient is admitted to the hospital as an inpatient or as an outpatient for services or tests. Admission date is inserted in Field 12 of the Uniform Bill (UB-04) inpatient hospital billing claim form. The electronic version requires an eight-character date listing year, month, and day: 20XX0328. For an admission notice for hospice care for a Medicare patient, enter the effective date of election of hospice benefits.