FIMES Home – About Our Practice Request Appointment Internal Medicine Endocrinology Medical Services Endocrine Services Appointments and Patient Forms Patient Portal Carefirst PCMH Weight Loss Clinic Lab Locations and Directions Payment Patient PortalIf you are interested in enrolling in the Patient Portal at Frederick Internal Medicine and Endocrinology Services please ask the front desk at your next visit.Go to www.athenahealth.com to enroll. Phone 301-663-3836 Fax 1-833-979-0962Office Hours 7:30 AM – 5:00 PM (M-F)Phones 8:30 AM – 4:00 PM (M-F)65C Thomas Johnson DriveFrederick, MD 21702