Quick answers
- Which hospitals does Denise Ythier work at?
- Medicare's official clinician data lists Denise Ythier at 1 hospital: Westchester Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Denise Ythier see patients?
- Medicare's clinician data lists 2 practice locations, including Valhalla, NY. Call before your visit to confirm the address.
- What is Denise Ythier's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Denise Ythier accept Medicare assignment?
- Yes. Medicare's clinician data says Denise Ythier 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.
- Does Denise Ythier offer telehealth?
- Medicare's clinician data says Denise Ythier offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Denise Ythier?
- (914) 493-6940, as listed in official Medicare / NPI Registry data.
- What is Denise Ythier's NPI number?
- 1023018702. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Denise Ythier works
Medicare's Facility Affiliation Data lists Denise Ythier at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Westchester Medical CenterValhalla, NY · Acute Care Hospital · CCN 330234
Practice locations
Addresses where Denise Ythier is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Woods RdValhalla, NY 10595
- 95 Grasslands RdValhalla, NY 10595 (914) 493‑6940
Group practices
Medicare enrollment lists Denise Ythier as a member of this group (CMS data updated 2026-10-02).
- Westchester Medical Center Advanced Physician Services PC897 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Valhalla
Clinicians with the same Medicare primary specialty in Valhalla, NY — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1987 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1023018702 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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