Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Stephanie Elizabeth O'Brien, DO

Hospitalist Physician in Tucson, AZ · enumerated 2023.

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

National Provider Identifier

1346944105

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Registry record

Entity type Individual (Type 1)

Name Stephanie Elizabeth O'Brien

Credential DO

Sex Female

Practice address 6200 N La Cholla Blvd, Tucson, AZ, 85741

Phone (520) 742-9000

Enumeration date Mar 27, 2023

Last updated in NPPES Jul 9, 2026

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 012484 (AZ) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 012484 (AZ) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Stephanie O'Brien practice?

The practice location on file with NPPES is in Tucson, AZ. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Stephanie O'Brien?

The National Provider Identifier (NPI) for Stephanie O'Brien is 1346944105, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Mohammad Khedr Critical Care Medicine (Internal Medicine) Physician · Tucson, AZ NPI 1427051705 Edward Omron Critical Care Medicine (Internal Medicine) Physician · Tucson, AZ NPI 1134123755 Rhonda Nieto Anesthesiology Physician · Tucson, AZ NPI 1093711624 Kathleen Nichols Anesthesiology Physician · Tucson, AZ NPI 1033116462 Khawaja Rahman Internal Medicine Physician · Tucson, AZ NPI 1508865239 Kimberly Clipp Neonatal Nurse Practitioner · Tucson, AZ NPI 1265432652 John Weilbacker Emergency Medicine Physician · Tucson, AZ NPI 1124013966 Steven Behr Anesthesiology Physician · Tucson, AZ NPI 1538155072

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-09.