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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

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Specialties & Research

Dr. William Mark, MD is board certified in Internal Medicine.

Education & Awards

Dr. Mark graduated from Drexel University , Philadelphia.


Dr. Mark has 2 hospital affiliations:

  • Bryn Mawr Hosp, Bryn Mawr, Pa 
  • Paoli Memorial Hospital, Paoli, Pa 

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Additional Information
Dr. William Steven Mark MD is a male Internist, has 42 years of experience and practices in Internal Medicine.
Where does Dr. William S. Mark practice?
Dr. William Mark has 1 office location.
Dr. William Mark practices Internal Medicine near Paoli, PA.
See Paoli Internists.