Mark S. Keisler, M.D.
NPI 1023159431ActiveIndividual· Ophthalmology· Lexington, SC
Ophthalmology (M.D.) in Lexington, South Carolina, trained at Medical University of South Carolina College of Medicine (class of 1979). In 2024 Medicare paid $86,338 for 816 patients, and Part D covered 469 of their prescriptions, 59% of them generic. Tarsus Pharmaceuticals, Inc. was the largest of 2 companies reporting payments in 2025, $40.54 in all, mostly food and beverage.
Overview
| NPI | 1023159431 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 9, 2007 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | 11332 | SC |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Ophthalmology (SC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 816 |
|---|---|
| Services billed | 1,355 across 33 procedure codes |
| Paid by Medicare | $86,338 |
Part D prescriptions in 2024
| Prescriptions (claims) | 469 · 842 30-day fills |
|---|---|
| Patients | 160 |
| Total drug cost | $77,773 |
| Generic share | 59% of claims |
Education and affiliations
| Medical school | Medical University of South Carolina College of Medicine |
|---|---|
| Graduation year | 1979 |
| Medicare specialty | Ophthalmology |
Medical group
- Palmetto Ophthalmology Associates PALeesville, SC · 7 clinicians
Hospital affiliation
- Lexington Medical CenterWest Columbia, SC
Industry payments (Open Payments)
- 2025$40.54 · 2 payments from 2 companies
- 2024$88.21 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Tarsus Pharmaceuticals, Inc. | $21.15 | 1 |
| Amgen Inc. | $19.39 | 1 |
What the 2025 payments were for
- Food and Beverage$40.54 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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