Marilyn Kay Kosier, M.D.
NPI 1710169974ActiveIndividual· Ophthalmology· Lancaster, OH
Ophthalmology (M.D.) in Lancaster, Ohio, trained at Ohio State University College of Medicine (class of 1980). Their prescriptions cost Medicare Part D more than their services did: $290,250 for 2,615 claims, against $108,066 paid for services in 2024. Tarsus Pharmaceuticals, Inc. was the largest of 3 companies reporting payments in 2025, $62.95 in all, mostly food and beverage.
Overview
| NPI | 1710169974 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Nov 29, 2007 |
| Last updated in NPPES | May 15, 2020 |
| Certified by provider | May 15, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | 35-056213 | OH |
| Specialist | 174400000X | 35-05-6213K | OH |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Ophthalmology (OH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 569 |
|---|---|
| Services billed | 1,588 across 42 procedure codes |
| Paid by Medicare | $108,066 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,615 · 3,470 30-day fills |
|---|---|
| Patients | 620 |
| Total drug cost | $290,250 |
| Generic share | 65% of claims |
Education and affiliations
| Medical school | Ohio State University College of Medicine |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Ophthalmology |
Hospital affiliation
- Fairfield Medical CenterLancaster, OH
Industry payments (Open Payments)
- 2025$62.95 · 3 payments from 3 companies
- 2024$41.66 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Tarsus Pharmaceuticals, Inc. | $29.64 | 1 |
| Abbvie Inc. | $17.64 | 1 |
| Lkc Technologies, Inc. | $15.67 | 1 |
What the 2025 payments were for
- Food and Beverage$62.95 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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