DR. JOHN GREGORY DUFFY MD
NPI 1255497251
Psychiatry & Neurology - Psychiatry in Santa Ana, CA

Q: What is John Duffy's NPI number?

The NPI number for John Duffy is 1255497251. It was assigned to this individual provider in the NPPES registry on December 28, 2006.

Q: What is John Duffy's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for John Duffy was last updated on March 15, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.

Active since December 28, 2006PECOS Enrolled

1401 N. TUSTIN AVENUE, SUITE 130, SUITE 165, SANTA ANA, CA 92705(714) 542-3008(714) 542-3617 Get Directions Write a Review

NPPES record last updated: March 15, 2023. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About Dr. John Gregory Duffy Md NPPES

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

DR. JOHN GREGORY DUFFY MD (NPI 1255497251) is an individual psychiatry provider in Santa Ana, California, licensed in California (A54948) and active in the NPI registry since December 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1255497251

Entity TypeIndividualMale

Primary Taxonomy2084P0800X

Provider Legal NameDR. JOHN GREGORY DUFFYCredential: MD

Location Address1401 N. TUSTIN AVENUE, SUITE 130, SUITE 165Santa Ana, CA 92705

Mailing Address1401 N. Tustin Avenue, Suite 130, Suite 165Santa Ana, CA 92705 · (714) 542-3008 · Fax (714) 542-3617

Phone(714) 542-3008

Fax(714) 542-3617

Sole ProprietorNo

Enumeration DateDecember 28, 2006

Last NPPES UpdateMarch 15, 2023

NPPES CertifiedMarch 15, 2023

✔ NPI 1255497251 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 · A54948

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.

1401 N. TUSTIN AVENUE, SUITE 130, Santa Ana, CA 92705

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Other Identifiers 1

OtherA54948CA · Medical License

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. John Gregory Duffy Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer– Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92705 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$187.60 typical visit price

range $62.96 – $187.60

Typical copayment $46.90 (range $15.74 – $46.90)

Most-billed visit code 99205

Established Patient

$77.96 typical visit price

range $20.84 – $153.61

Typical copayment $19.49 (range $5.21 – $38.40)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Duffy's NPI number?

The NPI number for John Duffy is 1255497251. It was assigned to this individual provider in the NPPES registry on December 28, 2006.

Where is John Duffy located?

John Duffy practices at 1401 N. Tustin Avenue, Suite 130 Suite 165, Santa Ana, CA 92705. The listed phone number is (714) 542-3008.

What is John Duffy's specialty?

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

Is John Duffy enrolled in Medicare?

Yes. John Duffy is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for John Duffy was last updated on March 15, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.