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  • Office

    1010 4th St SW
    Ste 305
    Mason City, IA 50401
    Phone+1 641-428-5700
    Fax+1 641-428-2515

Summary

  • Dr. William Riesen, MD is a board certified internist in Mason City, Iowa. He is currently licensed to practice medicine in Iowa, Michigan, and Michigan.

Education & Training

  • Perelman School of Medicine at the University of Pennsylvania
    Perelman School of Medicine at the University of PennsylvaniaClass of 1988

Certifications & Licensure

  • IA State Medical License
    IA State Medical License 1996 - 2026
  • MI State Medical License
    MI State Medical License 1995 - 1999
  • MI State Medical License
    MI State Medical License 1995 - 1999
  • Internal Medicine
    American Board of Internal Medicine Internal Medicine