Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum
Alan C. Westeren, M.D., Inc.
Ophthalmology Physician in San Diego, CA · enumerated 2005 · authorized official Alan Westeren, Chief Executive Officer.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1902880867
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Registry record
Taxonomy & classification
Authorized official
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 00G797380 | Medicaid | CA | - |
| P00131150 | Other | CA | RAILROAD MEDICARE NUMBER |
| W18008A | Other | CA | MEDICARE POWAY OFFICE |
| W18008 | Other | CA | MEDICARE COSTA MESA OFFC |
| W18008B | Other | CA | MEDICARE SAN DIEGO OFFICE |
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
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Providers at this address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-10-21.