Dr. Mark M Callahan, MD is a Internist - General practicing in New York, NY
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|Physician Assistant Studies, Barry University, FL||Medical Degree||1986|
Dr. Mark M Callahan, MD has not yet indicated the hospitals that he is affiliated with.
Accepts New Patients: Yes
Dr. Mark M Callahan, MD has not yet listed the medications that he commonly prescribes.
Dr. Mark M Callahan, MD has not yet added any information about his practice's billing policies and payment options.