Oncology Specialist (cancer), Hematology Specialist, Internist
4 years of experience
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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Education & Awards

Dr. O'Mahar graduated from Washington University at St. Louis, Saint Louis.


Dr. O'Mahar has 3 hospital affiliations:

  • Fort Memorial Hospital 
  • St. Mary's Hospital Medical Center-Madison 
  • St Mary'S Hospital 

> > > > Dr. Shannon O'Mahar, MD

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Additional Information
Dr. Shannon Eileen O'Mahar MD is a female Oncologist , has 4 years of experience and practices in Internal Medicine, Medical Oncology, and Hematology.
Where does Dr. Shannon E. O'Mahar practice?
Dr. Shannon O'Mahar has 2 office locations.
Dr. Shannon O'Mahar practices Internal Medicine, Medical Oncology, and Hematology near Madison, WI.
Additional practice locations include: Janesville, WI and Fort Atkinson, WI.
See Madison Internists, Madison Oncologists, and Madison Hematologists.