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Allergy & Immunology Specialist, Internist
31 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).

Learn more about Dr. Mark O'Hollaren:

View the full profile to get information on:

  1. Qualifications
  2. What's important to you

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Patient Reviews

4.5
  •  
(4)
Patient comments (0)

The overall average patient rating of Dr. Mark O'Hollaren is Excellent. Dr. O'Hollaren has been reviewed by 4 patients who have provided 0 comments. The rating is 4.5 out of 5 stars.

Patient Ratings
Ease of Appointment 2.3
  •  
Promptness 2.3
  •  
Courteous Staff 3.7
  •  
Accurate Diagnosis 5.0
  •  
Bedside Manner 5.0
  •  
Spends Time with Me 5.0
  •  
Follows Up After Visit 5.0
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Specialties & Research

Dr. Mark O'Hollaren, MD is board certified in Allergy & Immunology and Internal Medicine.

  • He has special expertise in 3 areas:
  • Asthma
  • Hay Fever (Seasonal Allergic Rhinitis)
  • Nasal Allergy (Rhinitis)

Education & Awards

Dr. O'Hollaren graduated from Oregon Health & Science University, Portland.


Affiliations

Dr. O'Hollaren has 3 hospital affiliations:

  • Providence St Vincent Medical Center 
  • Oregon Health & Science Univ H, Portland, Or 
  • Oregon Health Science University 

> > > > Dr. Mark O'Hollaren, MD

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Additional Information
Dr. Mark Thomas O'Hollaren MD is a male Allergist & Immunologist, has 31 years of experience and practices in Allergy & Immunology and Internal Medicine.
Where does Dr. Mark T. O'Hollaren practice?
Dr. Mark O'Hollaren has 1 office location.
Dr. Mark O'Hollaren practices Allergy & Immunology and Internal Medicine near Portland, OR.
See Portland Allergists and Portland Internists.