Quannacut Outpatient Services

QOPS Exterior

905 East Main Street, Riverhead, NY 11901 | (631) 369-8966

Offsite Locations:

  • 291 Hampton Road, Southampton, NY 11968
  • 201 Manor Place, Greenport, NY 11944


Quannacut Outpatient Services is a 14,000 square foot state-of-the-art behavioral health facility at the forefront of modern treatment for substance use disorders across Eastern Long Island. Quannacut addresses patients’ immediate and long-term substance use issues, as well as the impact on their support system, family members and significant others. Centrally located in Riverhead, the facility provides highly individualized programs for patients with diverse needs across a wide variety of treatment disciplines so that patients can receive all outpatient care in one location.


  • Intake assessments by appointment, Monday-Saturday
  • Walk-in intake assessments Mondays and Fridays, 9am-12pm


  • Co-occurring servicesQOPS Collage2
  • Medical psycho-therapeutic approach
  • Completely individualized treatment
  • Individual, family, marital and group psychotherapy
  • Specialty Groups including Young Adults, Women, Co-occurring Disorders and Advanced Recovery
  • Medication for Opioid-Use Disorder (MOUD)
  • Psychiatric evaluations and medication management services
  • Primary care medical services
  • NYS Department of Motor Vehicle Treatment site
  • Two sober houses
  • Medication for Alcohol-Use Disorder (MAUP)

Our Team

  • Experts in co-occurring disorders
  • Over 85 percent clinical staff Masters level and above
  • Physicians Buprenorphine certified
  • Medical staff specialists in Family Medicine, Addictions and Psychiatry


Jarid Pachter, DO

Jarid Pachter, DO
Medical Director, Quannacut Outpatient Services
Diplomate, American Osteopathic Association, Family Medicine
Diplomate, American Society of Addiction Medicine

Southold, (631) 734-8742


Quannacut Outpatient Services Forms

Quannacut Outpatient Services In the News


The Suffolk Times - April 1
During COVID, another crisis continued: opioids


MD News - April 1
Quannacut Outpatient Services, Stony Brook Medicine: Driving Breakthroughs in Addiction Treatment


Long Island Business News - November 21
Stony Brook Medicine Opens Expanded Behavioral Health Facility

Shelter Island Reporter - November 21
Expanded Behavioral Health Facility Opens in Riverhead

Riverhead News-Review - November 20
Expanded Behavioral Health Facility Opens in Riverhead

East End Beacon - November 20
Beefing Up the East End's Substance Abuse Treatment