Dr. John Barnhill
Ophthalmology (Ophthalmology Physician)
At a glance
- Years since graduation
- 4
- In the NPI registry since
- 2022
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2022Registered with an NPI (national billing number; not a license date)
Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Ophthalmology Physician primary
NC license 2026-02332 -
Internal Medicine Physician
SC license LL87777
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Medical groups
- Vidant Medical Group LLC (1,012 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Latanoprost Other prescribers in Columbia, SC | 22 |
| Dorzolamide-Timolol (dorzolamide hcl/timolol maleat) Other prescribers in Columbia, SC | 14 |
| Prednisolone Acetate Other prescribers in Columbia, SC | 12 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 8 companies reported 12 payments worth $1,210 in total to this clinician.
| Alcon Vision LLC | $423 |
|---|---|
| Sight Sciences, Inc. | $137 |
| Bausch & Lomb Americas Inc. | $131 |
| New World Medical,inc. | $131 |
| Amgen Inc. | $125 |
| AbbVie Inc. | $125 |
| Sun Pharmaceutical Industries Inc. | $102 |
| Glaukos Corporation | $36.78 |
| Food and Beverage | $1,210 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.