NPI Portal NPI Lookup & Verification

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

Dr. Arthur Darrell Hagan, M.D.

Cardiovascular Disease Physician in Stillwater, OK · enumerated 2006.

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

National Provider Identifier

1811928021

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Registry record

Entity type Individual (Type 1)
Name Dr. Arthur Darrell Hagan
Credential M.D.
Sex Male
Practice address Stillwater, OK, 74074
Phone (405) 743-2354
Fax (405) 743-2950
Enumeration date Jul 5, 2006
Last updated in NPPES Mar 10, 2020

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

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 15022 (OK) Secondary
207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 15022 (OK) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
100174340B 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

Where does Arthur Hagan practice?
The practice location on file with NPPES is in Stillwater, OK. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Arthur Hagan?
The National Provider Identifier (NPI) for Arthur Hagan is 1811928021, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-03-10.