Landon James Karren, D.O.
NPI 1518212893ActiveIndividual· Ophthalmology· Grand Forks, ND
Ophthalmology (D.O.) with Christian D Nilson MD PC, practicing in Grand Forks, North Dakota. In 2024 Medicare paid $319,177 for 277 patients, and Part D covered 356 of their prescriptions, 71% of them generic. Amgen Inc. was the largest of 8 companies reporting payments in 2025, $266.85 in all, mostly food and beverage. Lists Intermountain Health Logan Regional Hospital as a hospital affiliation.
Overview
| NPI | 1518212893 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Jul 23, 2012 |
| Last updated in NPPES | Aug 16, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | 15921 | ND |
| Ophthalmology | 207W00000X | DO176816 | OR |
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 (UT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 277 |
|---|---|
| Services billed | 3,161 across 42 procedure codes |
| Paid by Medicare | $319,177 |
Part D prescriptions in 2024
| Prescriptions (claims) | 356 · 481 30-day fills |
|---|---|
| Patients | 130 |
| Total drug cost | $30,612 |
| Generic share | 71% of claims |
Education and affiliations
| Graduation year | 2012 |
|---|---|
| Medicare specialty | Ophthalmology |
Medical group
- Christian D Nilson MD PCLogan, UT · 3 clinicians
Hospital affiliation
Industry payments (Open Payments)
- 2025$266.85 · 11 payments from 8 companies
- 2024$297.04 · 11 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $97.98 | 3 |
| Sun Pharmaceutical Industries Inc. | $46.04 | 2 |
| Tarsus Pharmaceuticals, Inc. | $34.04 | 1 |
| Genentech USA, Inc. | $22.07 | 1 |
| Sight Sciences, Inc. | $20.52 | 1 |
What the 2025 payments were for
- Food and Beverage$266.85 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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