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

Dr. James Frederick Guenther, D.O.

Addiction Medicine (Internal Medicine) Physician in Lancaster, OH · enumerated 2005.

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

National Provider Identifier

1417933490

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Registry record

Entity type Individual (Type 1)

Name Dr. James Frederick Guenther

Credential D.O.

Sex Male

Practice address Lancaster, OH, 43130

Phone (740) 653-9411

Fax (740) 277-6131

Enumeration date Dec 21, 2005

Last updated in NPPES Aug 4, 2023

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

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 34.004690 (OH) Secondary

207RA0401X Addiction Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 34.004690 (OH) 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
0733488	Medicaid	OH	-
311274950	Other	OH	TAX I.D.

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 James Guenther's NPI record?

Cross-check NPI 1417933490 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1417933490 active?

Yes, as of the latest NPPES snapshot, NPI 1417933490 is active (record last updated 2023-08-04).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-08-04.