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Northwell Health Mather Hospital

Port Jefferson, NY

SAMHSA Verified Joint Commission Inpatient PHP MAT Dual Dx Telehealth

Inpatient · PHP · MAT · Dual Dx center · in Port Jefferson, NY · Accepts Medicaid · Medicare · Private · Serves adolescents, seniors.

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Direct line to Northwell Health Mather Ho...: (631) 473-3877

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About Northwell Health Mather Hospital

Northwell Health Mather Hospital provides comprehensive behavioral health services for both adults and adolescents who are dealing with significant psychiatric symptoms. The center offers a partial hospitalization program (PHP), which serves as a structured level of care for individuals who do not require a full inpatient stay but need more support than traditional outpatient therapy. This program is designed to be a step-down from an inpatient unit or to help prevent the need for hospitalization altogether. They offer a safe and therapeutic environment for individuals to focus on their mental health and recovery during the day while returning home in the evenings.
The treatment at the center is built around a collaborative and individualized plan, created with input from the client, their family, and their referring doctor. A variety of therapeutic methods are used, including individual, group, and family therapy sessions. Through these therapies, clients work on developing better coping strategies to handle daily stressors, learn to effectively manage their psychiatric symptoms, and gain a deeper understanding of their mental and emotional health. The goal is to empower each person with the skills needed for independent functioning and long-term wellness in a supportive setting.
A distinctive aspect of the program is its structured, full-day schedule, which runs from Monday through Friday, providing consistency and intensive care. For adolescents, the program integrates educational services, including tutoring, to ensure they can keep up with their schoolwork while receiving treatment. Furthermore, professional staff are available for crisis coverage 24 hours a day, 7 days a week, ensuring that support is always accessible for clients and their families when it is needed most, providing a crucial safety net.

Classified as multi-setting mental health facility (e.g., non-hospital residential plus either outpatient and/or partial hospitalization/day treatment). private non-profit organization. Primary focus: substance use treatment, mental health treatment.

This listing is sourced from the SAMHSA Behavioral Health Treatment Services Locator. Data last synced: April 2026. Always verify current programs and insurance directly with the facility.

Quick Facts

Programs, populations, and payments verified via SAMHSA.

Level of care
Inpatient · PHP · MAT · Dual Dx · Telehealth
Service settings
Outpatient
Therapy approaches
Cognitive behavioral therapy, Couples/family therapy, Dialectical behavior therapy, Group therapy, Integrated Mental and Substance Use Disorder treatment, Individual psychotherapy, Telemedicine/telehealth therapy
Age groups
Children/Adolescents, Young Adults, Adults, Seniors
Special populations
Clients with co-occurring mental and substance use disorders
Medications used
Olanzapine, Quetiapine, Risperidone, Nicotine replacement, Non-nicotine smoking/tobacco cessation, Antipsychotics used in treatment of SMI
Recovery supports
Mentoring/peer support
Facility operation
Private non-profit organization

Insurance & Payment Accepted

Verify coverage
Medicaid
Medicare
Private insurance
TRICARE / VA
Self-pay / Cash
Sliding scale

Full list from SAMHSA: Medicare; Medicaid; Private health insurance; Cash or self-payment; State-financed health insurance plan other than Medicaid

Contact & Location

Address

100 Highlands Boulevard, Port Jefferson, NY 11777

Get directions →

Facility direct line

(631) 473-3877

Frequently Asked Questions

Does Northwell Health Mather Hospital accept Medicaid?
Yes. According to SAMHSA data, Northwell Health Mather Hospital accepts Medicaid. Coverage specifics (copays, prior authorization) depend on the specific NY Medicaid plan. Call (631) 473-3877 to verify your benefits.
What level of care does Northwell Health Mather Hospital offer?
This facility offers: Inpatient, PHP, MAT, Dual Dx, Telehealth. Service settings include: Outpatient. Primary focus: Substance use treatment, Mental health treatment, Treatment for co-occurring substance use plus either serious mental health illness in adults/serious emotional disturbance in children.
Does Northwell Health Mather Hospital have specialized programs?
Yes — this facility offers programs for: Clients with co-occurring mental and substance use disorders.
What therapy methods does Northwell Health Mather Hospital use?
Evidence-based approaches listed with SAMHSA: Cognitive behavioral therapy, Couples/family therapy, Dialectical behavior therapy, Group therapy, Integrated Mental and Substance Use Disorder treatment, Individual psychotherapy, Telemedicine/telehealth therapy.
How do I start treatment at Northwell Health Mather Hospital?
Call the facility directly at (631) 473-3877 for an intake assessment. Our free 24/7 helpline (+1 (205) 973-2878) can also help you compare programs, verify insurance, and navigate options. No physician referral is required.
Is treatment confidential?
Yes. Federal law (42 CFR Part 2) provides strict confidentiality protections for substance use treatment records — stricter than HIPAA. Records cannot be disclosed without written consent, even to family, employers, or law enforcement.
What happens when you call? (general intake process)

Most treatment centers follow a 4-step intake: (1) confidential assessment — substance history, mental health, insurance, preferences (protected by 42 CFR Part 2); (2) insurance verification — facility contacts your plan to confirm coverage and out-of-pocket costs; (3) level-of-care recommendation — clinical staff match you to detox, residential, PHP, IOP, or outpatient based on severity; (4) admission typically within 24–48 hours. Timing varies by facility and bed availability.

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Sources & References

  • SAMHSA — Behavioral Health Treatment Services Locator. Source of facility programs, services, and accepted payments.
  • SAMHSA — NSDUH, 2023.
  • CMS — Mental Health Parity and Addiction Equity Act (MHPAEA).
  • 42 CFR Part 2 — Confidentiality of SUD Patient Records.

Facility data last synced: April 2026. Editorial policy.

24/7 Helpline +1 (205) 973-2878