Enrolling in the Keesler Hospital You may enroll or transfer your TRICARE Prime enrollment to the Keesler Hospital at the Patient Registration Office, room GF400, near the escalators or at the TRICARE Service Center on DeBuys Road. Following are other useful numbers you may need: TRICARE Operations Patient Administration (TOPA) Flight Admission & Dispositions: Open 24 hrs a day. 376-4722/376-4723 Outpatient Records: 7 a.m. - 5 p.m Monday-Thursday, 7.a.m - 4 p.m. Fridays). 376-4733/376-4735 Inpatient Records: 7 a.m.-5 p.m. (closed on non-training Fridays). 376-4708/376-4706