Katherine A. Hollister, MD
NPI 1386083962ActiveIndividual· Internal Medicine· Portsmouth, NH
Internal Medicine (MD) in Portsmouth, New Hampshire, trained at Pennsylvania State University College of Medicine (class of 1996). Part D covered 123 prescriptions written in 2024, 82% of them generic. Baxter Healthcare reported $61.49 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1386083962 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 18, 2013 |
| Last updated in NPPES | Jul 23, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 12107 | NH |
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 - Internal Medicine (NH) |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 123 · 288 30-day fills |
|---|---|
| Patients | 27 |
| Total drug cost | $18,961 |
| Generic share | 82% of claims |
Education and affiliations
| Medical school | Pennsylvania State University College of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Internal Medicine |
Medical group
- Greater Seacoast Community HealthSomersworth, NH · 35 clinicians
Industry payments (Open Payments)
- 2025$61.49 · 1 payment from 1 company
- 2024$40.74 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Baxter Healthcare | $61.49 | 1 |
What the 2025 payments were for
- Food and Beverage$61.49 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 46 internal medicine physicians in Portsmouth · All internal medicine physicians in New Hampshire