Dr. Patrick F. Callahan, MD is a reputable medical institution located at 198 Thomas Johnson Drive in Frederick, Maryland, United States. Specializing in providing top-notch healthcare services, Dr. Callahan and his team are dedicated to delivering personalized and comprehensive medical care to their patients. With a focus on promoting overall health and well-being, this institution offers a wide range of services to address various medical needs. Patients can trust in the expertise and compassion of Dr. Callahan and his staff for all their healthcare needs.