Behavioral Health Services

Stony Brook Eastern Long Island Hospital (SBELIH) is home to several of the most highly regarded behavioral health programs in Suffolk County. Behavioral Health Services provide treatment for substance use and/or mental health disorders from a medical and psycho-therapeutic approach. Often the treatment specializes in co-occurring disorders. Treatment is provided by an interdisciplinary team of psychiatric nurses, clinical social workers, recreation therapists and board certified physicians.

Services include inpatient and outpatient Addiction Services under the Quannacut program and inpatient Psychiatry for Adults 18+. The philosophy of “Quannacut” (the Native American word for “hope’’ or “rainbow”) addresses addiction/chemical dependency 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 Services


Outpatient Services


of Psychiatry

All Quannacut Inpatient Services are provided at Stony Brook Eastern Long Island Hospital in Greenport, NY.

  • Intake
  • Rehabilitation
  • Detoxification

Located in Riverhead, NY, 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. Off-site locations in Southampton and Greenport.


SBELIH is home to:




Lloyd Simon, MD

Lloyd Simon, MD
Director of Addiction Services

Diplomate, American Board of Internal Medicine
Diplomate, American Society of Addiction Medicine

Southold, (631) 765-4150