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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).

Learn more about Dr. Erik Gierahn:

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Specialties & Research

Dr. Erik Gierahn, MD is board certified in Emergency Medicine.

Education & Awards

Dr. Gierahn graduated from University of Wisconsin at Madison.


Dr. Gierahn has 5 hospital affiliations:

  • St. Mary's Hospital-Milwaukee 
  • Sacred Heart Rehabilitation Institute 


  • Spanish

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Additional Information
Dr. Erik Paul Gierahn MD is a male Emergency Medicine Specialist, has 8 years of experience and practices in Emergency Medicine.
Where does Dr. Erik P. Gierahn practice?
Dr. Erik Gierahn has 3 office locations.
Dr. Erik Gierahn practices Emergency Medicine near Milwaukee, WI.
Additional practice locations include: West Bend, WI.
See Milwaukee Emergency Physicians.