Customers looking for Hepatitis B and Hepatitis C titer (A titer is a blood draw to test for immunity, not a vaccine), including scheduling an appointment, can dial: 240.777.1760. Treatment for Hepatitis B and Hepatitis C is no longer administered through the county. The Office provides information about the services offered and how to obtain those services in the private sector. Proof of residency in Montgomery County is not required for services. The STI/HIV clinic is located at: 2000 Dennis Avenue, Silver Spring, MD 20902. Office hours: Monday through Friday, 8:00 AM - 4:30 PM. The office is closed for lunch from noon - 1:00 p.m. daily. If customer is calling or transferred during that time, please leave a message.