In the event of a medical emergency, always dial 911 immediately. DTC accepts telephone inquiries Monday through Friday, from 8:00 a.m. to 12:00 p.m. and 1:30 p.m. to 4:30 p.m. If you have an urgent medical question outside of business hours, you may follow the phone prompts to be connected with the on-call provider. For non-urgent matters, please call back during regular office hours.