Katherine Danielle Williamson, MD
NPI 1982916375ActiveIndividual· Pediatrics· Lake Forest, CA
Pediatrics (MD) in Lake Forest, California, licensed in CA, with an NPI issued in July 2010. Alk-Abello, Inc was the largest of 12 companies reporting payments in 2025, $558.09 in all, mostly food and beverage.
Overview
| NPI | 1982916375 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 14, 2010 |
| Last updated in NPPES | Jan 17, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Pediatrics Primary | 208000000X | A112985 | CA |
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) | Not in the public enrollment file of Oct 1, 2026 |
|---|
Industry payments (Open Payments)
- 2025$558.09 · 24 payments from 12 companies
- 2024$482.03 · 21 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alk-Abello, Inc | $83.93 | 3 |
| Mirum Pharmaceuticals, Inc. | $80.02 | 2 |
| Ars Pharmaceuticals Operations, Inc. | $73.35 | 3 |
| Sanofi Pasteur Inc. | $67.30 | 3 |
| Merck Sharp & Dohme LLC | $66.15 | 4 |
What the 2025 payments were for
- Food and Beverage$558.09 · 24 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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