Definition:

Quadrants of Care is a conceptual framework that classifies settings within which clients with Co-Occurring Disorders (COD) are treated. The four quadrants are based on relative symptom severity, rather than by diagnosis. This helps determine levels of care.

  • Category I: Less severe mental disorder/less severe substance disorder
  • Category II: More severe mental disorder/less severe substance disorder
  • Category III: Less severe mental disorder/more severe substance disorder
  • Category IV: More severe mental disorder/more severe substance disorder

An image showing the Level of Care Quadrants. Alcohol and Other Drug Abuse from low to high severity. And Mental Illness from low to high severity.

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addiction SUD Substance Use Disorder Resource assessment Mental Health Disorder co-occurring disorders IDDT COD Dual Diagnosis