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JOHN GREGORY DUFFY MD, APC
NPI 1093985137
Psychiatry & Neurology - Psychiatry in Tustin, CA

Active since March 05, 2008
17821 E 17ST, SUITE 165, TUSTIN, CA 92780(714) 669-3158(714) 669-3198 Get Directions Write a Review

NPPES record last updated: March 11, 2008. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About John Gregory Duffy Md, Apc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN GREGORY DUFFY MD, APC (NPI 1093985137) is a healthcare organization registered as a psychiatry in Tustin, California and active in the NPI registry since March 2008. The organization lists John Gregory Duffy, President, as its authorized official.

NPPES Registry Identity

NPI1093985137
Entity TypeOrganization
Primary Taxonomy2084P0800X
Legal Business NameJOHN GREGORY DUFFY MD, APC
Location Address17821 E 17ST, SUITE 165Tustin, CA 92780-2136
Mailing Address17821 E 17st, Suite 165Tustin, CA 92780-2136 · (714) 669-3158 · Fax (714) 669-3198
Phone(714) 669-3158
Fax(714) 669-3198
Organization SubpartNo
Authorized OfficialJohn Gregory DuffyPresident · (714) 669-3198
Enumeration DateMarch 5, 2008
Last NPPES UpdateMarch 11, 2008
✔ NPI 1093985137 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · A054948
Definition
A Psychiatrist 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.
17821 E 17ST, Tustin, CA 92780
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Other Identifiers 1

Medicare PINW18168CA

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Gregory Duffy MD, Apc's NPI number?

The NPI number for John Gregory Duffy MD, Apc is 1093985137. It was assigned to this organization in the NPPES registry on March 5, 2008.

Where is John Gregory Duffy MD, Apc located?

John Gregory Duffy MD, Apc is located at 17821 E 17st Suite 165, Tustin, CA 92780. The listed phone number is (714) 669-3158.

What is John Gregory Duffy MD, Apc's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

When was this NPI record last updated?

The NPPES record for John Gregory Duffy MD, Apc was last updated on March 11, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.