Behavioral Health and Psychiatry Services

Stony Brook Eastern Long Island Hospital (SBELIH) is the premier provider of behavioral healthcare and substance use treatment for Eastern Long Island and Suffolk County. SBELIH is Suffolk County’s only facility offering integrated care encompassing detoxification, rehabilitation and psychiatric services, along with medical services. We also provide Outpatient Addiction Services.

SBELIH’s Behavioral Health Services take a holistic approach to providing the highest caliber medicine, psychiatry and substance use treatment under one roof for an individualized inpatient and outpatient treatment experience for substance use and psychiatric conditions in Suffolk County. We don’t define our patients by their addiction or psychiatric diagnosis, as they are not the equivalent of it.

Services include inpatient and outpatient Addiction Services under the Quannacut program and inpatient Psychiatry for Adults 18+. The philosophy of SBELIH's Behavioral Health Services addresses addiction and mental health as a treatable disease. SBELIH’s Behavioral Health Center is a place where our compassionate professionals work to maintain a nurturing environment that enables patients to stabilize, recover, and transition back into the community.


Inpatient Behavioral Health Services
201 Manor Place
Greenport, NY 11944
(631) 477-8877
Quannacut Outpatient Services
905 East Main Street
Riverhead, NY 11901
(631) 369-8966

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