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Dual Diagnosis Service

  • A history of unclear assessment and diagnosis
  • A history of medical problems, such as limited effects of medication, side-effects of medication or being on many medications at once
  • Other health issues, such as communications disorders or seizure disorders, that complicate treatment.

The Dual Diagnosis service provides services which are coordinated within the broader continuum of supports and services, using approaches that integrate mental health and developmental perspectives. We operate both as an inpatient unit and as a community-based service. 

The Dual Diagnosis service primarily serves people who live in the old cities of Toronto, North York (west of Yonge St.), York, Etobicoke, Peel Region and Homes for Special Care in York Region. We accept referrals from outside our LHIN that match the service we provide,  and when we have capacity.  We also work closely with similar services across the province to facilitate timely response and the provision of care closer to home

Dual Diagnosis Resource Service (Toronto)​

Provides consultation, assessment, diagnosis, time limited treatment, respite, in-home and crisis supports, education, training and system facilitation including referrals to housing, vocational, educational and treatment services. Consultation and support to family members and service providers caring for individuals with Dual Diagnosis. Time-limited case management is available as part of these services.

Referral Required: No

Contact: (416) 535-8501, ext. 77809

Location: 501 Queen Street West, Toronto, ON, M5V 2B4

Dual Diagnosis Peel Region Consultation Service

Provides consultation, assessment, diagnosis, program recommendations, system facilitation, crisis planning, education and training.

Referral Required: No

Contact: (416) 535-8501, ext. 77713

Contact: Fax: (905) 568-4159

Location: 30 Eglinton Avenue West Suite 801, Mississauga, Ontario, L5R 3E7

Dual Diagnosis Day Treatment Service

The Dual Diagnosis Service offers Day Treatment for the inpatient unit and for individuals in the community who can benefit from time-limited admission for consultation, assessment, treatment, training and skills development as an alternative to hospitalization.

Referral Required: Access through consultation services.

Contact: Toronto: (416) 535-8501, ext. 77809

Contact: Peel: (416) 535-8501, ext. 77713

Location: Queen Street site, Unit 4, 4th floor


Dual Diagnosis Inpatient Unit

This unit has 15 beds for time limited admission, assessment and treatment for clients referred with a dual diagnosis.

Referral Required: Access is through the consultation service.

Contact: Toronto: (416) 535-8501, ext. 77809

Contact: Peel: (416) 535-8501, ext. 72870

Location: Queen Street site, Unit 4, 4th floor


Additional Resources:

For more information on dual diagnosis in Ontario, please refer to the attached:

Dual Diagnosis paper (Susan Morris​, 2003)

Joint Policy Guidelines for the Provision of Community Mental Health and Developmental Services for Adults with a Dual Diagnosis

​​CBC's The Current "Dual Diagnosis: The Long Way Home" Podcast​

CAMH Switchboard 416-535-8501
CAMH General Information Toronto: 416-595-6111 Toll Free: 1-800-463-6273
Connex Ontario Help Lines
Queen St.
1001 Queen St. W
Toronto, ON
M6J 1H4
Russell St.
33 Russell St.
Toronto, ON
M5S 2S1
College St.
250 College St.
Toronto, ON
M5T 1R8
Nine offices across Ontario