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).
Learn more about Dr. Shannon O'Mahar:
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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:
- St. Mary's Hospital Medical Center-Madison
- Fort Memorial Hospital
- St Mary'S Hospital
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- Additional Information
- Where does Dr. Shannon E. O'Mahar practice?
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.