John W. Barnhart, OD
- Medicare patients, 2024
- 190
- Part D claims, 2024
- 245
- Industry payments
- $277
- Affiliated sites
- 1
- State license
- 1
- Practice address
- 4620 Mahoning Ave, Warren, OH 44483-1419
- Practice phone
- Call (330) 847-9093
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
John W Barnhart OD
Physician office · Warren, Ohio
Find John Barnhart's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
John W. Barnhart is an optometrist in Warren, Ohio
John Barnhart practices at John W Barnhart OD in Warren, Ohio.
John Barnhart's NPI, 1407975113, was assigned on March 27, 2007. John Barnhart graduated from Ohio State University - College of Optometry in 1991. John Barnhart holds Ohio license 4265.
- NPI
- 1407975113NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5193758159
- NPI enumeration date
- March 27, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (330) 847-9093
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 61
- Medical school graduation
- 1991
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
John W. Barnhart practices at John W Barnhart OD in Warren, Ohio
John Barnhart's primary practice is John W Barnhart OD, at 4620 Mahoning Ave, Warren, OH 44483-1419. The practice phone is (330) 847-9093.
- John W Barnhart OD4620 Mahoning Ave, Warren, OH 44483-1419Phone(330) 847-9093
Source: Dmand AI Affiliation Data
John W. Barnhart is affiliated with 1 site of care
John Barnhart's primary practice is John W Barnhart OD in Warren, Ohio.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at John W. Barnhart's practice
Dmand AI tracks the electronic health record (EHR) system at each site where John Barnhart practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| John W Barnhart OD | Available with a free account |
Source: Dmand AI Technology Install Data
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John W. Barnhart is one of 2,779 optometrists in Ohio
Optometrist is John Barnhart's primary specialty in the NPI Registry, under taxonomy code 152W00000X. John Barnhart is licensed in Ohio.
Specialties and state licenses
- Optometrist, OhioPrimary
Optometrists near John Barnhart
Counts of optometrists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
John W. Barnhart treated 190 Medicare patients in 2024, average age 75
CMS counts 190 Medicare patients who saw John Barnhart in 2024. The largest group is 65 to 74, with 91 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.06, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts John Barnhart's median patient age at 67, with 61% women.
John Barnhart's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
John Barnhart's Medicare patients by sex, 2024
- Women10354%
- Men8746%
Chronic conditions among John Barnhart's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis43%
- Diabetes28%
- Ischemic heart disease25%
- Anxiety24%
- Chronic kidney disease21%
- COPD19%
Share of Medicare patients with each condition. A patient can have several.
John Barnhart's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women61%
- Men37%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
John W. Barnhart wrote 245 Medicare Part D claims in 2024
In 2024, John Barnhart wrote 245 Medicare Part D claims for 77 patients. 57% of them were for generic drugs.
John Barnhart's Part D claims by kind of drug, 2024
- Generic139 claims57%
- Brand-name106 claims43%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
John W. Barnhart ranks in the 47th percentile for cataract surgery in Medicare
John Barnhart accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 23 procedures of cataract surgery by John Barnhart, more than 47% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where John Barnhart ranks in Medicare procedure volume
- Cataract surgery
- 47th percentile23 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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John W. Barnhart received $277 in industry payments in 2025
CMS Open Payments shows 5 general payments to John Barnhart from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $157.
Companies that paid John Barnhart the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
John W. Barnhart graduated from Ohio State University - College of Optometry
John Barnhart graduated from Ohio State University - College of Optometry in 1991.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for John W. Barnhart's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about John W. Barnhart
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is John W. Barnhart's NPI number?
John W. Barnhart's NPI number is 1407975113. It was assigned on March 27, 2007, and it is active in the NPI Registry.
What does John W. Barnhart specialize in?
John W. Barnhart is an optometrist in Warren, Ohio. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does John W. Barnhart practice?
John Barnhart practices at 4620 Mahoning Ave, Warren, OH 44483-1419. John Barnhart's primary practice is John W Barnhart OD in Warren, Ohio.
What is John W. Barnhart's office phone number?
The practice phone on file for John Barnhart is (330) 847-9093.
What is John W. Barnhart's medical license number?
John Barnhart holds Ohio license 4265.
Does John W. Barnhart accept Medicare?
Yes. CMS lists John Barnhart as accepting Medicare assignment.
How many Medicare patients does John W. Barnhart see?
CMS counts 190 Medicare patients who saw John Barnhart in 2024, with an average age of 75.
Where did John W. Barnhart go to medical school?
John Barnhart graduated from Ohio State University - College of Optometry in 1991.
Has John W. Barnhart received payments from drug or device companies?
CMS Open Payments shows $277 in general payments to John Barnhart from 2 companies from 2025 to 2025. The largest total came from Alcon Laboratories Inc.
How long has John W. Barnhart been practicing?
John Barnhart graduated from medical school in 1991, 35 years ago.
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