University Hospital/Stony Brook ELIH Stony Brook Medicine/Quannacut OP
905 East Main Street
Riverhead, NY 11901
- Substance use treatment
- Transitional housing, halfway house, or sober home
- Treatment for co-occurring substance use plus either serious mental health illness in adults/serious emotional disturbance in children

Featured Local Providers
Payment & Services – University Hospital/Stony Brook ELIH Stony Brook Medicine/Quannacut OP
Payment & Payment Assistance:
- Federal, or any government funding for substance use treatment programs
- IHS/Tribal/Urban (ITU) funds
- Medicare
- Medicaid
- Private health insurance
- Cash or self-payment
University Hospital/Stony Brook ELIH information is sourced from SAMHSA.gov (Data updated 02/13/2025).



