Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Charles Edward Ronan, OD

Optometrist in Tahlequah, OK · enumerated 2017 · practices at Northeastern State University College of Optometry.

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

National Provider Identifier

1639696057

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Registry record

Entity type Individual (Type 1)

Name Dr. Charles Edward Ronan

Credential OD

Sex Male

Practice address 1001 N Grand Ave, Tahlequah, OK, 74464

Phone (918) 444-2109

Enumeration date Aug 25, 2017

Last updated in NPPES Aug 30, 2017

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 2950 (OK) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD 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

Where does Charles Ronan practice?

The practice location on file with NPPES is in Tahlequah, OK. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Charles Ronan?

The National Provider Identifier (NPI) for Charles Ronan is 1639696057, 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 2017-08-30.