Quick answers
- Does Katherine A. Hollister accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine A. Hollister accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Katherine A. Hollister's NPI number?
- 1386083962. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Katherine A. Hollister is enrolled with Medicare (CMS data updated October 2, 2026).
- 600 Lafayette RdPortsmouth, NH 03801 (603) 422‑8208
- 8 Greenleaf Woods DrPortsmouth, NH 03801 (603) 422‑8208
- 8 Greenleaf Woods Dr, Unit 100Portsmouth, NH 03801 (603) 422‑8208
Group practices
Medicare enrollment lists Katherine A. Hollister as a member of this group (CMS data updated October 2, 2026).
- Greater Seacoast Community Health35 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Portsmouth
Clinicians with the same Medicare primary specialty in Portsmouth, NH — not a recommendation.
Other clinicians in Greater Seacoast Community Health
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Pennsylvania State University College Of Medicine |
| Graduation year | 1996 (30 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1386083962 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians