Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Sarah Lynn Welsh, D.O.

Emergency Medicine Physician in Hayward, CA · enumerated 2006.

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

National Provider Identifier

1174541866

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Registry record

Entity type Individual (Type 1)

Name Sarah Lynn Welsh

Credential D.O.

Sex Female

Practice address 27200 Calaroga Ave, Hayward, CA, 94545

Phone (510) 264-4026

Enumeration date Jul 18, 2006

Last updated in NPPES Dec 10, 2008

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 20A9608 (CA) Primary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License DO1396 (NV) Secondary

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

What specialty is Sarah Welsh?

Sarah Welsh is registered in NPPES with the primary taxonomy of Emergency 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 2008-12-10.