Quick answers
- Where does Katherine Seibert see patients?
- Medicare's clinician data lists 1 practice location in Peekskill, NY. Call before your visit to confirm the address.
- What is Katherine Seibert's specialty?
- Medicare lists Medical Oncology as the primary specialty, and also Internal Medicine.
- Does Katherine Seibert accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine Seibert accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Katherine Seibert?
- (914) 734-8800, as listed in official Medicare / NPI Registry data.
- What is Katherine Seibert's NPI number?
- 1982616991. 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 Seibert is enrolled with Medicare (CMS data updated 2026-10-02).
- 1037 Main StPeekskill, NY 10566 (914) 734‑8800
Group practices
Medicare enrollment lists Katherine Seibert as a member of this group (CMS data updated 2026-10-02).
- Sun River Health Inc.243 clinicians in the group
Specialties
- Medical Oncologyprimary
- Internal Medicinealso
Other oncologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Creighton University School Of Medicine |
| Graduation year | 1976 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1982616991 |
| 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 2026-10-02, retrieved 2026-10-29
- 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