Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Chadwick Leon Simpson, M. D.

Emergency Medicine Physician in Harrison, AR · enumerated 2007.

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

National Provider Identifier

1508990730

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Registry record

Entity type Individual (Type 1)

Name Chadwick Leon Simpson

Credential M. D.

Sex Male

Practice address 511 Owl St, Harrison, AR, 72601

Phone (903) 280-8889

Enumeration date Mar 16, 2007

Last updated in NPPES Jan 7, 2016

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License E5205 (AR) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

How do I verify Chadwick Simpson's NPI record?

Cross-check NPI 1508990730 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1508990730 active?

Yes, as of the latest NPPES snapshot, NPI 1508990730 is active (record last updated 2016-01-07).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-01-07.