Outpatient Addictions Service

Alert: Some CHA centers and services will be closed on Columbus Day, October 14th. Please see this schedule for details.

The Outpatient Addictions Service (OAS) helps patients 18 and older. We are experienced in treating substance use disorders and co-occurring psychiatric disorders. Our staff includes psychiatrists, psychiatric nurse practitioners, psychologists and licensed clinical social workers.

Please note: Due to a high demand for our services, CHA is prioritizing appointments for patients who are enrolled in Primary Care at CHA. Patients who are not enrolled in Primary Care at CHA can be admitted to the Intensive Outpatient Addictions Program (IOP) only. If you or your loved one do not meet these criteria, our staff may be able to assist you in finding a referral service.

Intake: Our "walk-in" info and intake time is Tuesday at 11:30 AM. Clients get a comprehensive intake assessment to match them to the most appropriate level of care.


Intensive Outpatient Program (IOP)

  • Monday, Wednesday, and Friday: 9 a.m. - 12 noon. A group-based relapse prevention program for patients who are newly sober or in early recovery. Typically a 4-week program.

Outpatient Groups

  • Weekly, biweekly and monthly groups offered at various times of the day and evening to meet the needs of people at various stages of the recovery process.
  • Typically upon completion of IOP program, or for individuals who have had prior treatment. Most groups require sobriety and cover various topics: relapse prevention, recovery support, emotion management, health and wellness and living with co-occurring psychiatric disorders.
  • Groups are also offered for clients in the early stages of thinking about their addiction with no sobriety commitment.
  • Specialty groups may include: DBT, Mindful Recovery and Anxiety Management.

Individual Treatment

  • The Outpatient Addictions Service (OAS) has limited capacity to provide individual psychotherapy. The "treatment of choice" is generally group psychotherapy.
  • Case Management
  • Help finding community services and support.


  • Focuses on treating those individuals with both psychiatric and addictive disorders. Includes Medication-Assisted Treatment like Buprenorphine/”Suboxone” and Naltrexone. To be eligible for ongoing medication management, people must be enrolled in primary care at CHA and be engaged in group or individual treatment in the Outpatient Addiction Service.

Research Opportunities

  • MySafeRx is a medication adherence monitoring platform as part of an innovative treatment program for opioid use disorder. The MySafeRx intervention uses an Android mobile device application to integrate four key components into a novel platform for delivering remote, directly observed medication adherence monitoring of Buprenorphine (BUP) to individuals with opioid use disorder. These key components include the following: (1) mobile-based, confidential text messaging; (2) a secure electronic pill organizer system; (3) videoconference-based coaching with daily brief motivational interventions using empathic and compassionate motivational interviewing techniques and 4) a standardized protocol for supervised self-administration of medication and notification of clinicians when medication is missed. For more information email: mysaferx@challiance.org, call 617-591-8730 or visit www.mysaferx.org.
  • Mindfulness based Office Opioid Treatment (MINDFUL-OBOT) is a 6 month research study on the effect of mindfulness on opioid use and anxiety during primary care Buprenorphine treatment. Learn mindfulness tools to enhance your well-being and have the support of a group to prevent relapse, reduce craving and increase self-control. Eligible members are 18 years or older, currently prescribed Buprenorphine and able to attend weekly group and complete weekly surveys. For more information contact your CHA provider or mindfulobot@challiance.org 617-591-6055.

    Contact Us

  • Opioid Use Disorder Help Line

    P: (617) 591-6000
  • Outpatient Addictions

    26 Central Street Somerville, MA 02143
    P: (617) 591-6051 F: (617) 591-6054

    Admin Hours
    M - F: 9 am - 5 pm