Psychiatry Clinic

John Gregory Duffy Md, Apc

17821 E 17st, Suite 165, Tustin, California, 92780-2136

About John Gregory Duffy Md, Apc

John Gregory Duffy Md, Apc is a psychiatry clinic located in Tustin, California. The clinic is located at 17821 E 17st, Suite 165, Tustin, CA and can be reached at 714-669-3158. The authorized official for John Gregory Duffy Md, Apc is Dr. John Gregory Duffy, who serves as the clinic’s President. He/She can be contacted at 714-669-3198. The clinic’s primary license number in California is A054948 (Psychiatry) .
John Gregory Duffy Md, Apc Clinic specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

Clinic Information

John Gregory Duffy Md, Apc Clinic's specialty, address, contact phone number and fax are as below. Patients can contact the clinic at the given phone number for appointments.

Clinic Name John Gregory Duffy Md, Apc
Specialization Psychiatry
Practice Address 17821 E 17st, Suite 165
Tustin, CA - 92780-2136
Fax 714-669-3198

Authorized/Official Person Profile

Officially authorized person to contact for any management issues or complaints for this clinic are as below. Person's position and contact details are also mentioned below.

Name Dr. John Gregory Duffy
Position President
Contact Number 714-669-3198

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.

NPI Number1093985137
NPI Enumeration Date: 05 Mar, 2008
NPI Last Update On: 11 Mar, 2008

Medical Licenses

Organizations can have one or more medical licenses for different specialities in the same state or different states. Related medical licenses for John Gregory Duffy Md, Apc are as mentioned below.
License NumberSpecializationStateStatus
A054948Psychiatry CaliforniaPrimary

Mailing Address

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

John Gregory Duffy Md, Apc
17821 E 17st, Suite 165
Tustin, CA - 92780-2136
Phone: 714-669-3158
Fax: 714-669-3198

Book an Appointment with John Gregory Duffy Md, Apc

To schedule an appointment, contact John Gregory Duffy Md, Apc at 17821 E 17st, Suite 165, Tustin, California or call the phone number listed below.

Book an Appointment

Frequently Asked Questions

Below are some commonly asked questions about John Gregory Duffy Md, Apc clinic:

John Gregory Duffy Md, Apc is a psychiatry clinic specializing in Psychiatry.

John Gregory Duffy Md, Apc is located at 17821 E 17st, Suite 165, Tustin, California 92780-2136.

Patients can contact John Gregory Duffy Md, Apc at 714-669-3158 for inquiries about its services and appointments.

Please contact John Gregory Duffy Md, Apc directly to inquire about new-patient availability and appointment options.
* Availability may change.

John Gregory Duffy Md, Apc specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

Patients can contact John Gregory Duffy Md, Apc at 714-669-3158 to inquire about appointments, consultation requirements and available services.

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