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quimson behavioral health adult forensic psychiatry oregon washington

Quimson Behavioral Health

Adult Mental Health Treatment

Based in the Pacific Northwest.

  • Tele-health/virtual sessions available throughout Oregon and Washington

  • In-person available in Portland, Oregon.

quimson behavioral health

Thoughtful, comprehensive psychiatry and therapy rooted in cultural understanding and whole-person care

About Section

Seeking Balance

Quimson Behavioral Health, LLC provides in-person and tele-health/virtual mental health treatment to patients located throughout Oregon and Washington.

 

Our office is located on the westside of Portland, in Bethany Village. We are also in close proximity to Beaverton and Hillsboro

We employ a balanced treatment approach which  includes evidence-based medication management, patient education and psychotherapy.

inclusive BIPOC LGBTQ all are welcome
Balance

Patient Care

We provide diagnosis and treatment of mental health disorders, including but not limited to: 

  • Generalized Anxiety Disorder (Anxiety)

  • Panic Disorder (Panic Attacks)

  • Social Anxiety Disorder (Social Phobia) 

  • Obsessive Compulsive Disorder (OCD) 

  • Attention Deficit Hyperactivity Disorder (ADHD)

  • Major Depressive Disorder (Depression)

  • Bipolar Disorder (Manic Depression)

  • Schizoaffective Disorder

  • Schizophrenia

 

 

 

Our Current Providers:

  • Pia Quimson-Guevarra, DO- Psychiatrist

  • Cayley Mesterheide, PA- Physician Assistant

We both provide evidence-based medication management and psychoeducation in our 30 minute sessions.

Dr. Quimson-Guevarra can provide combined medication management and therapy or therapy only sessions.

These sessions last 60 minutes. 

 

Dr. Pia Quimson-Guevarra also provides psychiatric expert witness services, including forensic consultation and evaluation. 

Judge
Clean Bubbles

OUR HOURS

Monday - Friday

By Appointment Only

OUR LOCATION

15160 NW Laidlaw Road, Suite 240, Portland, OR 97229

Contact Us

For Non-Urgent Issues:

Phone: 503.832.9293

Fax: 503.832.9357

In Event of Medical or Psychiatric Emergency:

Please call 911 or a Crisis Line (see telephone numbers below) or go to the nearest Emergency Room for assistance. 

Oregon

  • Washington County Crisis Line 503.291.9111

  • Multnomah County Crisis Line 503.988.4888 or 1.800.716.9796

  • Clackamas County Crisis Line                   503-655-8585

  • ​List for Oregon Counties

Washington

  • King County Crisis Line                                  1-866-427-4747

  • Clark, Skamania, Klicitat County Crisis Line 1-800-626-8137

  • List for Washington Counties 

Nationwide

  • Veterans Crisis Line 1.800.273.TALK (8255)

© 2026 by Quimson Behavioral Health                

 

Disclaimer:

The content at Quimson Behavioral Health’s website, including its’ blog and social media accounts, is for informational purposes only. Information is gathered and shared from reputable sources; however, Quimson Behavioral Health is not responsible for errors or omissions in reporting or explanation. No individuals, including those who are under Quimson Behavioral Health’s care, should use the information contained within for self-diagnosis or self-treat of any mental health or medical condition. This information should not be a substitute for your provider’s care or advice. 

 

As a reader, you have not entered a patient-physician relationship with me.  Therefore, I ask that you not ask me for medical advice, either in the comments or by email. I may delete such comments and accept no responsibility to respond to unsolicited email.

 

If you are experiencing a medical or psychiatric emergency, please call 911 or go to your nearest emergency room.

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