Psychologist | Clinical Psychology | 28+ years experience

Dr. Patrick Michael Grehan, PH.D.

721 Franklin Ave, Garden City, New York, 11530-4524

About Dr. Patrick Michael Grehan

Dr. Patrick Michael Grehan is a psychologist based in Garden City, New York with 28 years of experience in Clinical Psychology. He completed his graduation in 1998. He accepts the Medicare-approved amount. Patients will not be billed for any more than the Medicare deductible and coinsurance. Active license number of Dr. Patrick Michael Grehan is 014194 for Clinical Psychology in New York. His current practice location is 721 Franklin Ave, Garden City. Patients can contact him at 516-256-9250. Dr. Patrick Michael Grehan, PH.D., specializes in Clinical Psychology and his NPI number (Unique professional ID assigned by NPPES) is 1407924368.

Dr. Patrick Michael Grehan is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Practice Information

Dr. Patrick Michael Grehan'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 Dr. Patrick Michael Grehan
Specialization Clinical Psychology
Credentials PH.D.
Accepts Medicare Assignment Yes
Experience 28+ years
Graduation Year 1998
Gender Male
Practice Address: 721 Franklin Ave,
Garden City, NY - 11530-4524

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 1850494394
Enrollment ID I20070321000385
NPI Number1407924368
NPI Enumeration Date: 30 Nov, 2006
NPI Last Update On: 21 Jun, 2013

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 Dr. Patrick Michael Grehan are as mentioned below.

License NumberSpecializationStateStatus
014194Clinical 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.

Dr. Patrick Michael Grehan
721 Franklin Ave,
Garden City, NY - 11530-4524
Phone: 516-256-9250

Book an Appointment with Dr. Patrick Michael Grehan

To schedule an appointment, contact Dr. Patrick Michael Grehan at 721 Franklin Ave, Garden City, New York or call the phone number listed below.

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Frequently Asked Questions

Below are some commonly asked questions about Dr. Patrick Michael Grehan:

Dr. Patrick Michael Grehan is a psychologist specializing in Clinical Psychology. He is a mental health professional with highly specialized training in the diagnosis and psychological treatment of mental, behavioral and emotional illnesses, including obsessive-compulsive disorder (OCD). His main focus is on diagnosing and treating mental, emotional, and behavioral disorders. Some of the common disorders that he can treat are learning disabilities, substance abuse, depression, anxiety, and eating disorders.

Dr. Patrick Michael Grehan has approximately 28 years of experience in Clinical Psychology.

Yes, Dr. Patrick Michael Grehan accepts Medicare assignment, meaning the provider participates in Medicare and accepts Medicare-approved amounts for eligible services.

Yes, Dr. Patrick Michael Grehan 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.

Dr. Patrick Michael Grehan practices at 721 Franklin Ave, Garden City, New York, 11530-4524.

To schedule an appointment with Dr. Patrick Michael Grehan, please contact the office at 516-256-9250.

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