Quannacut Outpatient Services

Modern treatment for substance use disorder.

Addiction is real. So is recovery. Quannacut Outpatient Services is a behavioral health facility that 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.

Outpatient Services Offered

Telehealth Services
Convenient virtual appointments available for ongoing support and therapy.

Co-occurring Services
Specialized treatment for individuals facing both substance use and mental health challenges using a psychotherapeutic, medical approach.

Medication for Addiction Treatment
Evidence-based medications provided to support recovery from substance use disorders, including Suboxone, Vivitrol, Naltrexone and Antabuse.

Psychiatric Evaluations
Comprehensive assessments and medication management services by experienced psychiatrists.

Primary Care Medical Services
Addressing physical health needs alongside behavioral health concerns, including walk-in evaluations.

NYS Department of Motor Vehicle Treatment Site
Providing necessary evaluations and treatments for driver’s license reinstatement.

Monday: 9 am - 8 pm
Tuesday: 9 am - 5 pm
Wednesday: 9 am - 8 pm
Thursday: 9 am - 8 pm
Friday: 9 am - 2 pm
Saturday: 8:30 am -12:30 pm

Walk-In Assessments Available:
Monday 9 am - 12 pm
Friday 9 am - 12 pm

Quannacut Outpatient Services
905 East Main Street
Riverhead, NY 11901
(631) 369-8966

Satellite offices in Southampton and Greenport.


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

Riverhead: (631) 369-8966 / Southold: (631) 734-8742

Douglas K. Hoverkamp, MD
Psychiatric Director, Quannacut Outpatient Services
Director, Department of Psychiatry, SBELIH
Diplomate, American Board of Psychiatry
Riverhead: (631) 369-8966 / Greenport: (631) 477-6890


Call For Appointments
(631) 477-8877
Intake assessments are completed Monday to Friday, 7 am to 7 pm
(631) 477-5234
Detoxification assessments are available 24 hours per day, 7 days per week through the Emergency Department
(631) 477-5325
Inpatient Psychiatry
(631) 477-5265
(631) 477-5268
Quannacut Outpatient Services
(631) 369-8966