Corewell Health Care Center - Big Rapids Building hours: 6:45 am to 7:00 pm - Please see below for individual clinic hours. Big Rapids Family Medicine Monday through Thursday, 6:45 a.m. to 7 p.m. Friday, 7:15 a.m. to 5 p.m. Urgent Care Monday through Sunday, 7 a.m. to 7 p.m. Rehabilitation Services Monday through Thursday, 7 a.m. to 6:30 p.m. Friday, 7 a.m. to 5 p.m. Radiology Imaging Services Monday through Sunday, 7 a.m. to 7 p.m. Laboratory Services Monday through Friday, 7 a.m. to 3:30 p.m. Occupational Health Monday, Tuesday, Thursday, Friday, 6:30 a.m. to 5 p.m. Wednesday, 8 a.m. to 4:30 p.m.