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. Kathleen O'Brien:

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Specialties & Research

Dr. Kathleen O'Brien, MD is board certified in Emergency Medicine.

Education & Awards

Dr. O'Brien graduated from University of Massachusetts, Worcester.


Dr. O'Brien has 1 hospital affiliations:

  • University Medical Center - Tucson 


  • Spanish
  • English

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Additional Information
Dr. Kathleen Mary O'Brien MD is a female Emergency Medicine Specialist, has 5 years of experience and practices in Emergency Medicine.
Where does Dr. Kathleen M. O'Brien practice?
Dr. Kathleen O'Brien has 2 office locations.
Dr. Kathleen O'Brien practices Emergency Medicine near Tucson, AZ.
Additional practice locations include: Boston, MA.
See Tucson Emergency Physicians.