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Co-occurring Disorders


Co-occurring disorders (COD, also known as dual diagnosis) refers to an individual having one or more substance abuse disorders and one or more mental health disorders. Each disorder can cause symptoms of the other disorder leading to slow recovery and reduced quality of life.

The Oregon Health Authority (OHA) works with behavioral health system partners to improve services to Oregonians with co-occurring disorders by:
  • Developing funding strategies.
  • Developing competencies.
  • Providing training and technical assistance to staff on program integration and evidence-based practices. 
  • Conducting fidelity reviews of evidence based practices for the COD population.
  • Revising the Integrated Services and Supports Oregon Administrative Rule.
The high rate of co-occurrence between substance use and mental health disorders argues for a comprehensive approach to intervention that identifies, evaluates, and treats each disorder concurrently. Concurrent treatment of co-occurring disorders is considered the expectation for both addictions and mental health service providers.



Assessment Tool - Dartmouth School of Medicine
Comorbidity: Substance Use Disorders and Other Mental Illnesses (NIDA 2018)
Dual Diagnosis Anonymous
Information Center - Mental Health Association of New York
Integrated Treatment for Co-Occurring Disorders
Oregon Co-Occuring Services Directory

Program Contact

Nicole Corbin