Quick answers
- Which hospitals does Ioannis Mantzaris work at?
- Medicare's official clinician data lists Ioannis Mantzaris at 1 hospital: Montefiore Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ioannis Mantzaris see patients?
- Medicare's clinician data lists 1 practice location in Bronx, NY. Call before your visit to confirm the address.
- What is Ioannis Mantzaris's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does Ioannis Mantzaris accept Medicare assignment?
- Medicare's clinician data says Ioannis Mantzaris may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Ioannis Mantzaris offer telehealth?
- Medicare's clinician data says Ioannis Mantzaris offers telehealth services. Ask the office which visits can be done by video or phone.
- What is Ioannis Mantzaris's NPI number?
- 1871865519. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ioannis Mantzaris works
Medicare's Facility Affiliation Data lists Ioannis Mantzaris at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Montefiore Medical CenterBronx, NY · Acute Care Hospital · CCN 330059
Practice locations
Addresses where Ioannis Mantzaris is enrolled with Medicare (CMS data updated 2026-10-02).
- 111 E 210th StBronx, NY 10467
Group practices
Medicare enrollment lists Ioannis Mantzaris as a member of this group (CMS data updated 2026-10-02).
- Montefiore Medical Center2,820 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in Bronx
Clinicians with the same Medicare primary specialty in Bronx, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1871865519 |
| 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