John W. Barnhart, O.D.
Optometrist · Warren, OH
John W. Barnhart, O.D. is an optometrist with a practice address in Warren, Ohio, and NPI 1407975113, issued on Mar 27, 2007. Check the license (Ohio 4265, as entered in NPPES) with the Ohio board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John W. Barnhart
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 4265 OH
Self-reported in NPPES; status is on the state search - Practice location
- 4620 Mahoning Ave NW, Warren, OH 44483
- Phone
- (330) 847-9093
- Enumerated
- Mar 27, 2007
- Record last updated
- Oct 2, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (330) 847-2225
- Medicaid ID
- 0141868 OH
- Medicare enrollment
- Enrolled (PECOS I20110502000022); accepts Medicare assignment
- Medical or professional school
- Ohio State University - College Of Optometry, 1991
- Entity
- Type 1 · individual
8 nearest optometrist records → All 2,443 in Ohio → Look up another NPI →
Verify John W. Barnhart in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Ohio board licenses this profession
Search for license 4265Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
12% fewer Medicare Part D claims than the average optometrist in 2024
245 Medicare Part D claims for 77 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 43% of claims.
Most prescribed
- Latanoprost97 claims
- Brimonidine Tartrate17 claims
- Timolol Maleate14 claims
- Dorzolamide Hcl13 claims
- Neomycin-Polymyxin-Dexameth13 claims
- Loteprednol Etabonate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $413.18
10 payments; by number, the most common kind was food and beverage; the largest payer was CooperVision Inc. The 34,453 providers of this specialty with any payment received $769.99 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
John W. Barnhart among 2,443 optometrist records in Ohio
John W. Barnhart, O.D. is one of 2,443 optometrist records with a practice address in Ohio. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 41% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1991 · median 2006 among the 1,466 with a school on file
- Record last updated2012 · 70% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a Ohio practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in Ohio
There are 2,443 optometrist records in Ohio.
All 2,443 in Ohio → Every provider in Warren → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Thomas Abruzzi, O.D.Warren, OH 444831588669790
- Christopher D'Apolito, ODWarren, OH 444831053939777
- Robert Fleischer, ODWarren, OH 444831245333871
- Frank D'Apolito, O.D.Warren, OH 444841801898606
- Carla Darak-Bolino, O.D.Warren, OH 444841467454405
- Chad Douglas, O.D.Warren, OH 444841609858240
- Diana Douglas, O.D.Warren, OH 444841144452459
- Thomas Grischow, O.D.Warren, OH 444841932132818
Common questions
What is John W. Barnhart, O.D.'s NPI number?
John W. Barnhart, O.D.'s National Provider Identifier (NPI) is 1407975113, issued on Mar 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John W. Barnhart, O.D. located?
The NPPES record lists a practice address at 4620 Mahoning Ave NW, Warren, OH, 44483. Phone: (330) 847-9093. Providers update this record themselves, so call before visiting.
How can I verify John W. Barnhart, O.D.'s license?
NPPES lists Ohio license number 4265, as entered by the provider. Search the Ohio board that licenses this profession; the NPPES record confirms identity only.
How much does John W. Barnhart, O.D. prescribe under Medicare Part D?
In 2024, John W. Barnhart, O.D. had 245 Medicare Part D claims for 77 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.