Psychologist | General Psychology | 42+ years experience

William Marrin, PHD

200 Belle Terre Rd, Port Jefferson, New York, 11777-1928

About William Marrin

William Marrin is a psychologist based in Port Jefferson, New York with 42 years of experience in General Psychology. He completed his graduation in 1984. He accepts the Medicare-approved amount. Patients will not be billed for any more than the Medicare deductible and coinsurance. Active license number of William Marrin is 008777 for General Psychology in New York. His current practice location is 200 Belle Terre Rd, Port Jefferson. Patients can contact him at 631-474-6000. William Marrin, PHD, specializes in General Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1861493629.

William Marrin is specialized in psychological testing and evaluating or assessing patient's personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning. Accordingly, he performs counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy. He can diagnose and treat mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability by psycheducational evaluation, therapy, remediation, and consultation.

Practice Information

William Marrin's specialty, credentials, practice address, contact phone number and fax are as below. Patients can call on the below given phone number for appointment.

Provider Name William Marrin
Specialization General Psychology
Credentials PHD
Accepts Medicare Assignment Yes
Experience 42+ years
Graduation Year 1984
Gender Male
Practice Address: 200 Belle Terre Rd,
Port Jefferson, NY - 11777-1928

Professional Identification Codes

NPI number stands for National Provider Identifier which is a unique 10-digit identification number issued to healthcare providers in the United States by the Centers for Medicare and Medicaid Services (CMS). NPI details are as mentioned below.

PAC ID 5092744276
Enrollment ID I20050808000959
NPI Number1861493629
NPI Enumeration Date: 02 Aug, 2005
NPI Last Update On: 05 May, 2011

Medical Licenses:

Healthcare professionals can hold one or more medical licenses for different specialties in the same state or different states. Related medical licenses for William Marrin are as mentioned below.

License NumberSpecializationStateStatus
008777General Psychology New YorkPrimary

Mailing Address

Business mailing address can be used for mailing purpose only, for visiting purpose patients need to refer above mentioned Practice address.

William Marrin
8 Manor Rd,
Smithtown, NY - 11787-2715
Phone: 631-265-4670

Book an Appointment with William Marrin

To schedule an appointment, contact William Marrin at 200 Belle Terre Rd, Port Jefferson, New York or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about William Marrin:

William Marrin is a psychologist specializing in General Psychology. He is specialized in psychological testing and evaluating or assessing patient's personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning. Accordingly, he performs counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy. He can diagnose and treat mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability by psycheducational evaluation, therapy, remediation, and consultation.

William Marrin has approximately 42 years of experience in General Psychology.

Yes, William Marrin accepts Medicare assignment, meaning the provider participates in Medicare and accepts Medicare-approved amounts for eligible services.

Yes, William Marrin is currently accepting new patients. To schedule an appointment, contact the office directly and schedule an appointment.
*Availability may change. Please contact the office directly to ask about appointments.

William Marrin practices at 200 Belle Terre Rd, Port Jefferson, New York, 11777-1928.

To schedule an appointment with William Marrin, please contact the office at 631-474-6000.

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**Data of this site is collected from Medicare & Medicaid Services (CMS) and NPPES. Last updated on 14 September, 2026.