Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. John W Barnhart, OD

Individual provider Optometrist · NPI 1407975113

Dr. John W Barnhart, OD is an Optometry in Warren, Ohio. Graduated from Ohio State University - College of Optometry in 1991, 35 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in Ohio.

Years since qualifying
35
Trained at
Ohio State University - College of Optometry
Licensed in
OH
In the registry since
2007
What do these letters mean?
OD — Doctor of Optometry
An optometrist: examines eyes, prescribes glasses and contacts, and treats many eye conditions.

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Practice location Address checks out

4620 Mahoning Ave NW
Warren, OH 44483-1419
Phone: (330) 847-9093
Fax: (330) 847-2225
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence 4265 (OH)

Record details

NPI number1407975113
Entity typeIndividual (Type 1)
GenderMale
Credentials OD
Sole proprietorYes
NPI enumeratedMarch 27, 2007
Last updated in NPPESOctober 2, 2012
Mailing address4620 Mahoning Ave Nw, Warren, OH 44483-1419

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOPTOMETRY
Medical schoolOHIO STATE UNIVERSITY - COLLEGE OF OPTOMETRY
Graduated 1991 (35 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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