Dr. Mark O'Hollaren, MD

Dr. Mark O'Hollaren, MD

Internal Medicine  ·  
Male  ·  
Age 63
Dr. Mark O'Hollaren, MD is an internal medicine specialist in Portland, OR and has been practicing for 32 years. He graduated from Oregon Health and Science University School Of Medicine in 1980 and specializes in internal medicine and allergy & immunology.

511 SW 10th Ave Ste 1301

Portland, OR 97205

Contact Information

(503) 222-1966

Insurance Accepted

  • Aetna
  • First Health (Coventry Health Care)
  • MultiPlan

*Please verify this information when scheduling an appointment.

Learn about Dr. O'Hollaren

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Dr. O'Hollaren's Experience

Dr. O'Hollaren's experience matches your search based on the following criteria:
  • Based on total number of patients treated over the last 12 months
  • Specializes in Internal Medicine
  • Board certified in Allergy & Immunology and Internal Medicine
  • No malpractice claims found
  • No sanctions found
  • No board actions found

Care Philosophy

This content was provided by Dr. O'Hollaren "My goal is to listen carefully to my patients, and try to provide the finest quality care available to allow them to lead fuller and happier lives."

2  Specialties

  • Internal Medicine
  • Allergy & Immunology

2  Board Certifications

  • Allergy & Immunology
    Accredited by: American Board of Allergy & Immunology*
  • Internal Medicine
    Accredited by: American Board of Internal Medicine*

9  Conditions Treated

4  Procedures

Background Check

0 Malpractice Claims

No malpractice history found for Oregon.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Oregon Health and Science University School Of Medicine
    Medical School | Graduated 1980
  • Stanford University Med Center
    Residency Hospital | Completed 1983
  • Mayo Medical School
    Fellowship Hospital | Completed 1986

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. O'Hollaren has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

Dr. O'Hollaren does not have any memberships or affiliations listed. If you are Dr. O'Hollaren and would like to add memberships or affiliations, please update your profile.

Dr. O'Hollaren's Reviews

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