Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David C Walker, DO

Internal Medicine Physician in Sheridan, WY · enumerated 2006.

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

National Provider Identifier

1639142508

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Registry record

Entity type Individual (Type 1)

Name David C Walker

Credential DO

Sex Male

Practice address 1333 W 5th St, Ste 112, Sheridan, WY, 82801

Phone (307) 675-2650

Fax (307) 675-2651

Enumeration date Feb 9, 2006

Last updated in NPPES May 11, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 4231 (SD) Secondary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License TL2282 (WY) 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
6003370	Medicaid	SD	-

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 David Walker's NPI record?

Cross-check NPI 1639142508 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1639142508 active?

Yes, as of the latest NPPES snapshot, NPI 1639142508 is active (record last updated 2021-05-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-11.