Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

John W Barnhart Od Inc.

Optometrist in Warren, OH · enumerated 2006 · authorized official John Barnhart, President.

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

National Provider Identifier

1104851278

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Registry record

Entity type Organization (Type 2)

Legal business name John W Barnhart Od Inc.

Practice address 4620 Mahoning Ave, Warren, OH, 44483

Phone (330) 847-9093

Fax (330) 847-2225

Enumeration date Jul 11, 2006

Last updated in NPPES Oct 7, 2008

Taxonomy & classification

152W00000X Optometrist Eye and Vision Services Providers · License 4265 (OH) Primary

Authorized official

Name John Barnhart

Title President

Phone (330) 847-9093

Other identifiers

Identifier	Type	State	Issuer
0141868	Medicaid	OH	-

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

Where is John W Barnhart Od Inc. located?

The practice location on file with NPPES is in Warren, OH.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-10-07. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-10-07.