Marianne H. Cowley, MD
NPI 1811964448ActiveIndividual· Ophthalmology· Baltimore, MD
Ophthalmology (MD) with Johns Hopkins University and 1 other group, practicing in Baltimore, Maryland. In 2024 Medicare paid $253,201 for 379 patients, and Part D covered 159 of their prescriptions, 55% of them generic. Alcon Vision LLC reported $22.60 in payments in 2025, mostly food and beverage. Lists Johns Hopkins Hospital, the as a hospital affiliation.
Overview
| NPI | 1811964448 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 2, 2006 |
| Last updated in NPPES | Feb 28, 2023 |
| Certified by provider | Feb 28, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | D55897 | MD |
| Ophthalmology | 207W00000X | 24468 | KY |
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 (DC); Practitioner - Ophthalmology (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 379 |
|---|---|
| Services billed | 2,748 across 27 procedure codes |
| Paid by Medicare | $253,201 |
Part D prescriptions in 2024
| Prescriptions (claims) | 159 · 203 30-day fills |
|---|---|
| Patients | 44 |
| Total drug cost | $15,966 |
| Generic share | 55% of claims |
Education and affiliations
| Graduation year | 1982 |
|---|---|
| Medicare specialty | Ophthalmology |
Medical groups
- Johns Hopkins UniversityBaltimore, MD · 2,909 clinicians
- Johns Hopkins UniversityWashington, DC · 197 clinicians
Hospital affiliation
- Johns Hopkins Hospital, theBaltimore, MD
Industry payments (Open Payments)
- 2025$22.60 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alcon Vision LLC | $22.60 | 1 |
What the 2025 payments were for
- Food and Beverage$22.60 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 265 ophthalmologists in Baltimore · All ophthalmologists in Maryland