Placeholder Photo for Mark T. O Hollaren, MD

Dr. Mark O Hollaren is an allergist / immunologist treating patients near Portland that suffer from allergies and other diseases affecting the immune system.


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Allergy Clinic  

Accepting New Patients?

Yes, Dr. Mark T. O Hollaren is accepting new patients at this office.


(503) 226-8342


511 SW 10th Avenue, Suite 1301, Portland, OR 97205

Office Details

Doctor Specialties Allergy / Immunology & Allergy Medicine
Accepting New Patients? Yes
Practice Specialty Allergy / Immunology
Languages Spoken English

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Insurance Accepted  

  • Medicare

About Dr. O Hollaren
Dr. O Hollaren



Dr. O Hollaren has one office in Oregon where he specializes in Allergy / Immunology and Allergy Medicine.

Dr. O Hollaren works with two doctors including Dr. Barzin Khalili and Dr. Donald Dibbern.


Languages Spoken  

  • English
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