Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Justin Marshall O'Brien, MD

Psychiatry Physician in Irving, TX · enumerated 2021.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1306423017

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Registry record

Entity type Individual (Type 1)

Name Justin Marshall O'Brien

Credential MD

Sex Male

Practice address 4441 W Airport Fwy Ste 215, Irving, TX, 75062

Phone (469) 913-6136

Enumeration date Mar 27, 2021

Last updated in NPPES Dec 4, 2025

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License U3969 (TX) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Justin O'Brien?

Justin O'Brien is registered in NPPES with the primary taxonomy of Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Raphael Ye Interventional Pain Medicine Physician · Irving, TX NPI 1326314584 Trung Ha Interventional Pain Medicine Physician · Irving, TX NPI 1780936971 Iconiq Spine & Orthopaedic Center Pllc Interventional Pain Medicine Physician · Irving, TX NPI 1578279238 Harding Anesthesia Consultants LLC Certified Registered Nurse Anesthetist · Irving, TX NPI 1992538011 Stephanie Yianitsas Physician Assistant · Irving, TX NPI 1215824040 Jane Ewles Physician Assistant · Irving, TX NPI 1043173347

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-12-04.