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Pia Quimson-Guevarra, DO

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I am a board-certified psychiatrist; a medical doctor who specializes in mental health. I graduated from medical school in 2013 from Western University of Health Sciences in California. I completed my psychiatry residency training at Oregon Health and Science University (OHSU) and pursued additional training in Forensic Psychiatry. My interests include community and forensic psychiatry. 

At Quimson Behavioral Health, I provide clinical services in a supportive environment to promote emotional wellness and growth. I provide more than just a "medication check" appointment. I employ a balanced approach which includes medications, education and talk therapy. 

While I treat a variety of mental health conditions, I specialize in anxiety and depression. I also help others explore the impact of culture on their mental health. I identify as Filipina-American. 

Cayley Mesterheide, PA-C
Joining our team...February 15, 2023!

As a certified Physician Associate (PA-C) specializing in psychiatry, I have experience with evaluating, diagnosing and treating a wide variety of psychiatric disorders and enjoy working with patients of all ages and backgrounds.


My passion for psychiatry began before I started PA school while working as a nursing assistant in the psychiatric unit of a hospital. While working at the hospital, I achieved my Bachelor of Science in BioHealth Sciences degree at Oregon State University. I then went on to pursue my Master’s in PA Studies at Lipscomb University in Nashville, Tennessee.

My approach to treating mental health is holistic and includes a focus on medication management while incorporating supportive therapy and lifestyle modifications. I strive to connect with each and every patient and make it my goal to ensure that they feel heard and understood. Helping patients to find the right therapeutic regimen that allows them to function best in life brings me fulfillment in my career. I look forward to meeting and collaborating with you to help you achieve your mental health goals.

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Notice: 
Nothing on this website should be construed as legal advice. I am not licensed to practice law in any state and am not an attorney. I am not a disclosed Expert Witness or Forensic Psychiatric Consultant in a legal matter until there exists a signed Retention Contract. No attorney-client privilege exists as a retained Consultant. I welcome a call from attorneys, employers, government administrative bodies or others requiring forensic services to discuss your case to determine if my experience and credentials are appropriate to the case. I do not work directly with individuals representing themselves in

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