Dr. Mark Callahan is a Internal Medicine and General Physician in Madison, New York and has an experience of 40 years in these fields. Dr. Mark Callahan practices at Inflammatory Bowel Disease (IBD) Center - Mount Sinai Health System in Madison, New York and Mount Sinai Center for Advanced Medicine in Madison, New York. He completed Medical School from University of North Carolina at Chapel Hill in 1986,Medical School from The University of North Carolina in 1986 and Medical degree, DO from University Of North Carolina At Chapel Hill School Of Medicine in 1986. He is a member of American Board of Internal Medicine (ABMS®). Some of the services provided by the doctor are: Thyroid Screening,Type 2 Diabetes Treatment,Diabetes Screening,Anemia Treatment and Hypertension etc.