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Neurologist (brain, nervous system)
17 years of experience
Accepting new patients
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).

Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. Dennis O'Brien is Poor. Dr. O'Brien has been reviewed by 3 patients who have provided 0 comments. The rating is 1 out of 5 stars.

Specialties & Research

Dr. Dennis O'Brien, MD is board certified in Neurology.

  • He has special expertise in 5 areas:
  • Blood Disorders
  • Electromyography (EMG)
  • Gastrointestinal Cancer
  • Lung Cancer
  • Movement Disorders

Education & Awards

Dr. O'Brien graduated from University of Arizona, Tucson.


Dr. O'Brien has 3 hospital affiliations:

  • Northwestern Lake Forest Hospital 
  • Deaconess Billings Clinic 
  • Stillwater Community Hospital 


  • Spanish

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Additional Information
Dr. Dennis Kevin O'Brien MD is a male Neurologist, has 17 years of experience and practices in Neurology.
Where does Dr. Dennis K. O'Brien practice?
Dr. Dennis O'Brien has 5 office locations.
Dr. Dennis O'Brien practices Neurology near Billings, MT.
Additional practice locations include: Wilmette, IL and Evanston, IL.
See Billings Neurologists.