At Stony Brook Eastern Long Island Hospital (SBELIH), our community has access to the highest-quality medical advancements that Stony Brook Medicine is renowned for and the extraordinary care our hospital team has always delivered.

By collaborating with Stony Brook University Hospital (SBUH) and Stony Brook Southampton Hospital (SBSH), we are bringing academic and community medicine together to meet East End residents’ full range of healthcare needs.

Behavioral Health and Psychiatry

  • Treatment for substance use and mental health disorders
  • Medical and psycho-therapeutic approach
  • Specializing in co-occurring disorders
  • Comprehensive care in healing and therapeutic environment
  • Medication management
  • Group and individual therapy
  • Discharge planning to assist patients in their stabilization process

Psychiatry Residency Program

  • Focusing on community psychiatry and addiction psychiatry
  • First year includes four months of inpatient psychiatry at SBELIH; third year completed at Quannacut Outpatient Services

Quannacut Inpatient Services

  • Inpatient rehabilitation
  • Inpatient detoxification
  • Medication assisted treatment (MAT)
  • Medication management services
  • Group/Individual therapy
  • Recreation and creative arts therapy

Quannacut Outpatient Services

  • 14,000-square-foot, state-of-the-art behavioral health facility located in Riverhead
  • Advanced integrated treatment
  • Outpatient psychiatry
  • Medication assisted treatment (MAT)
  • Medication management services
  • Group/Individual therapy
  • Primary care medical services
  • Sober housing

Emergency Department

  • Accessible by land, sea and air 24/7/365
  • Nursing staff is Trauma Nursing Core Course (TNCC) certified


  • Gastrointestinal surgery
  • Emergency general surgery
  • Acute care surgery
  • Minimally invasive laparoscopic surgery
  • Diseases of the liver, spleen, upper/lower gastrointestinal systems
  • Laparoscopic appendectomy
  • Laparoscopic gallbladder surgery
  • Hernia repairs (laparoscopic and open)
  • Colonoscopy
  • Feeding tubes
  • Benign skin and soft-tissue tumors
  • Traumatic injuries

Laboratory Services

  • General Chemistry Hematology: Electrolyte levels, glucose levels, liver enzymes, cardiac markers, thyroid testing, hematology (including CBC panel), tick-borne disease panel
  • Influenza testing
  • COVID-19 testing
  • Micro-Biological testing

Radiology and Diagnostic Imaging

  • Bone mineral densitometry
  • 3D tomosynthesis mammography
  • Ultrasound/Sonography
  • 128-Slice CT scan
  • 1.5 Tesla magnetic resonance imaging (MRI)
  • Digital radiography (x-ray)

Physical Therapy

  • Gladys Brooks Fitness Center, Southold
  • Stony Brook Eastern Long Island Hospital, Greenport

Wound Care Center

  • State-of-the-art equipment
  • New wound-healing technology

Fast Stats: Calendar Year 2023

  • Beds: 70
  • Inpatient discharges: 2,211
  • Emergency Department visits: 6,574
  • Outpatient visits: 132,898
  • Surgeries (cases): 732
  • Imaging studies: 20,360
  • Laboratory tests: 93,158
  • Employees: 431
  • Physicians: 51
  • Volunteers: 100

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