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

Dr. Larry Johnston, D.O.

Gastroenterology Physician in Ames, IA · enumerated 2015.

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

National Provider Identifier

1386036333

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Registry record

Entity type Individual (Type 1)
Name Dr. Larry Johnston
Credential D.O.
Sex Male
Practice address Ames, IA, 50010
Phone (515) 239-4450
Enumeration date Feb 28, 2015
Last updated in NPPES Aug 2, 2022

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

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 05983 (IA) Primary
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 6004 (OK) Secondary
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

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 Larry Johnston practice?
The practice location on file with NPPES is in Ames, IA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Larry Johnston?
The National Provider Identifier (NPI) for Larry Johnston is 1386036333, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-08-02.