Quannacut Inpatient Behavioral Health Services

Group of 14 people outside by a large rock and yellow flowers

Integrated treatment that’s advancing recovery


At Stony Brook Eastern Long Island Hospital (SBELIH), we have one of the most highly regarded inpatient behavioral health programs in Suffolk County. If you, or someone you love, are considering treatment for substance use or mental health challenges, we can help. By combining the highest caliber medicine, psychology and behavioral therapy, our highly trained board certified physicians, nurses, alcoholism and substance abuse counselors, social workers, creative arts therapists, and dieticians are customizing solutions for each patient. This approach is at the forefront of modern treatment for substance use disorders. For many, entering Quannacut (the Native American word for rainbow – signifying hope) is the beginning of a new life. We embrace this decision and congratulate such courage.

Inpatient Services


Quannacut Rehabilitation is an inpatient rehabilitation program providing comprehensive treatment for those experiencing substance use or mental health difficulties.Treatment incorporates evidence-based education practices, mindfulness, life skills, medication management, group and individual counseling, and discharge planning, in a supportive and caring environment. Quannacut Detoxification is an inpatient detoxification program providing safe medical detoxification from substances. Patients are provided comprehensive treatment, discharge planning and medication management. Inpatient Psychiatry provides comprehensive care in a healing and therapeutic environment. Medication management, group and individual therapy, and discharge planning are provided to assist patients in their stabilization process. All inpatient programs offer medication for opiate use disorders and medication for alcohol use disorders.medication-assisted therapies, and all services are accredited by the Joint Commission of Accreditation and licensed by the New York State Office of Mental Health and/or New York State Office of Addiction Support and Services.

Admission for Inpatient Services

Inpatient Psychiatry
Greenport: (631) 477-5265 / (631) 477-5268

Inpatient Addiction Services, Greenport

Intake: (631) 477-8877
• Intake assessments completed Monday to Friday, 7 am to 7 pm

Detoxification: (631) 477-5234
• Detoxification assessments are available 24 hours per day, 7 days per week through the Emergency Department

Rehabilitation: (631) 477-5325

Lloyd Simon, MD
Medical Director & Chief of Addiction Medicine, SBELIH
Diplomate, American Board of Internal Medicine
Diplomate, American Society of Addiction Medicine

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
Director, Department of Psychiatry, SBELIH
Psychiatric Director, Quannacut Outpatient Services
Diplomate, American Board of Psychiatry
Greenport: (631) 477-6890

Daniel Klages, MD
Diplomate, American Board of Psychiatry
Greenport: (631) 477-1000