Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Thomas James Whalen, D.O.

Internal Medicine Physician in Norman, OK · enumerated 2006.

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

National Provider Identifier

1891869640

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas James Whalen

Credential D.O.

Sex Male

Practice address Norman, OK, 73072

Phone (405) 515-1000

Fax (405) 579-0477

Enumeration date Nov 20, 2006

Last updated in NPPES Feb 2, 2026

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 3124 (OK) 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
100120010A	Medicaid	OK	-

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 Thomas Whalen's NPI record?

Cross-check NPI 1891869640 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1891869640 active?

Yes, as of the latest NPPES snapshot, NPI 1891869640 is active (record last updated 2026-02-02).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-02-02.