Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Barbara Anne O'Brien, DO

Adult Medicine Physician in Ellisville, MO · enumerated 2006.

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

National Provider Identifier

1437211794

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Registry record

Entity type Individual (Type 1)

Name Barbara Anne O'Brien

Credential DO

Sex Female

Practice address 225 Clarkson Rd, Ellisville, MO, 63011

Phone (636) 685-7715

Fax (314) 590-5916

Enumeration date Dec 14, 2006

Last updated in NPPES Jul 16, 2018

Taxonomy & licenses

207QA0505X Adult Medicine Physician Allopathic & Osteopathic Physicians · License 2003000621 (MO) 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

Other identifiers

Identifier	Type	State	Issuer
000000014182	Other	MO	ESSENCE
182228	Other	MO	BCBS
633328	Other	-	HEALTHLINK
322212	Other	-	GHP
7432465	Other	-	AETNA
00000001482	Other	-	ESSENCE
209258102	Medicaid	MO	-
2312375	Other	-	UHC
036117870	Other	IL	BCBS IL
8008001	Other	-	CIGNA

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

What specialty is Barbara O'Brien?

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

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-07-16.