Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Brennan Thomas O'Brien I

General Practice Dentistry in Natchez, MS · enumerated 2010 · practices at Bitesize Smiles, LLC.

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

National Provider Identifier

1447577184

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Registry record

Entity type Individual (Type 1)

Name Dr. Brennan Thomas O'Brien I

Sex Male

Practice address 317 Highland Blvd Ste C, Natchez, MS, 39120

Phone (601) 445-8904

Fax (601) 897-4204

Enumeration date Apr 20, 2010

Last updated in NPPES Jul 2, 2018

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

1223G0001X General Practice Dentistry Dental Providers · License 3610-11 (MS) Primary

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

How do I verify Brennan O'Brien's NPI record?

Cross-check NPI 1447577184 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1447577184 active?

Yes, as of the latest NPPES snapshot, NPI 1447577184 is active (record last updated 2018-07-02).

Other providers at this practice address

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Bitesize Smiles, LLC Dentist · Natchez, MS NPI 1497686885

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-07-02.