Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Clark W Antonson, MD

Gastroenterology Physician in Lincoln, NE · enumerated 2005.

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

National Provider Identifier

1831182757

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Registry record

Entity type Individual (Type 1)

Name Dr. Clark W Antonson

Credential MD

Sex Male

Practice address 4545 R St, Lincoln, NE, 68503

Phone (402) 465-4545

Fax (402) 465-3621

Enumeration date Aug 25, 2005

Last updated in NPPES Jan 27, 2025

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 17282 (NE) Secondary

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 17282 (NE) 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

Is NPI 1831182757 active?

Yes, as of the latest NPPES snapshot, NPI 1831182757 is active (record last updated 2025-01-27).

How do I verify Clark Antonson's NPI record?

Cross-check NPI 1831182757 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-01-27.