Northwell Health Mather Hospital

100 Highlands Boulevard, Port Jefferson, NY 11777

✓ Joint Commission 2 care levels
(833) 567-5838 Free · Confidential · 24/7

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.

Who This Center Serves

Men Men and Women Women Adolescents Children Older Adults Young Adults Girls Boys

Services Offered

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
Outpatient
Multi-setting mental health facility (e.g., non-hospital residential plus either outpatient and/or partial hospitalization/day treatment)
Olanzapine Quetiapine Risperidone Nicotine replacement Non-nicotine smoking/tobacco cessation Antipsychotics used in treatment of SMI
Cognitive behavioral therapy Couples/family therapy Dialectical behavior therapy Group therapy Integrated Mental and Substance Use Disorder treatment Individual psychotherapy Telemedicine/telehealth therapy
Private non-profit organization
Medicare Medicaid Private health insurance Cash or self-payment State-financed health insurance plan other than Medicaid
Payment assistance (check with facility for details) Sliding fee scale (fee is based on income and other factors)
Clients with co-occurring mental and substance use disorders
Screening for tobacco use
Mentoring/peer support
Smoking/vaping/tobacco cessation counseling
Smoking not permitted
Children/Adolescents Young Adults Adults Seniors
Vaping not permitted
Court-ordered outpatient treatment Suicide prevention services

What to Expect at Northwell Health Mather Hospital

1. Initial Assessment

A clinical team evaluates your history, needs, and goals to create a personalized plan.

2. Active Treatment

Evidence-based therapies including 1-on-1 Counseling and Cognitive Behavioral Therapy, typically 7 days.

3. Progress & Recovery

Regular progress reviews, skill-building sessions, and adjustment of your treatment plan.

4. Aftercare Planning

Continued support, relapse prevention strategies, and connections to community resources for lasting recovery.

Contact Information

100 Highlands Boulevard, Suite 101, Port Jefferson, NY, 11777

Quick Facts

Program7 days
FocusThis center treats mental heal...
Insurance24 accepted
AccreditationJoint Commission

Free 24/7 Helpline

(833) 567-5838

Insurance verification · No obligation

Levels of Care

Available treatment intensities

Treatment Philosophy

Individual Treatment Twelve Step Family Involvement

Conditions & Substances Treated

Co-Occurring Disorders Drug Addiction Chronic Relapse Smoking Cessation

Verify Your Insurance Coverage

Free verification · Know your costs before you commit

(833) 567-5838

Frequently Asked Questions

Northwell Health Mather Hospital accepts 24 insurance providers including Aetna, Anthem, BlueCross BlueShield, Bright Health, CareFirst. Coverage varies by plan. Call (833) 567-5838 for free verification.

Northwell Health Mather Hospital offers Co-Occurring Mental Health, Outpatient, with therapies including 1-on-1 Counseling, Cognitive Behavioral Therapy, Family Therapy, Group Therapy. Plans are individualized.

Costs vary by level of care, duration, and insurance. Most major insurance is accepted. Call (833) 567-5838 for a free cost estimate.

Yes. Browse all centers in NY or call (833) 567-5838 for recommendations.

Treatment starts with a comprehensive assessment, then a personalized plan with individual therapy, group sessions, and evidence-based methods. Programs typically last 7 days. Aftercare planning ensures ongoing support.

More Centers in Port Jefferson

Need Help Choosing the Right Center?

Our counselors are available 24/7 to help you find the right program.

(833) 567-5838

Free · Confidential · No Obligation

Information last verified: April 2026 · Data sourced from SAMHSA
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