Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Barbara Willis Brown, O.D.
Optometrist in Saint Charles, MO · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1497966923
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Registry record
Entity type Individual (Type 1)
Name Dr. Barbara Willis Brown
Credential O.D.
Sex Female
Practice address 1592 Country Club Plaza Dr, Saint Charles, MO, 63303
Phone (636) 949-2900
Fax (636) 949-2270
Enumeration date May 25, 2007
Last updated in NPPES Jan 13, 2011
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 11769916 | Other | MO | CAQH |
| TO2948 | Other | MO | MISSOURI LICENSE |
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.
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 Barbara Brown?
Barbara Brown is registered in NPPES with the primary taxonomy of Optometrist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-01-13.