Quick answers
- Where does Iwona Dziewa see patients?
- Medicare's clinician data lists 2 practice locations, including Jefferson Valley, NY and Fishkill, NY. Call before your visit to confirm the address.
- What is Iwona Dziewa's specialty?
- Medicare lists Allergy/Immunology as the primary specialty, and also Pediatric Medicine.
- Does Iwona Dziewa accept Medicare assignment?
- Yes. Medicare's clinician data says Iwona Dziewa 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 Iwona Dziewa offer telehealth?
- Medicare's clinician data says Iwona Dziewa offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Iwona Dziewa?
- (914) 245-7700, as listed in official Medicare / NPI Registry data.
- What is Iwona Dziewa's NPI number?
- 1083091789. 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 Iwona Dziewa is enrolled with Medicare (CMS data updated 2026-10-02).
- 3680 Hill BlvdJefferson Valley, NY 10535 (914) 245‑7700
- 60 Merritt BlvdFishkill, NY 12524 (845) 231‑5600
Group practices
Medicare enrollment lists Iwona Dziewa as a member of this group (CMS data updated 2026-10-02).
- Optum Medical Care PC1,010 clinicians in the group
Specialties
- Allergy/Immunologyprimary
- Pediatric Medicinealso
Other allergist and immunologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1083091789 |
| 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