Quick answers
- Where does Gian A. Leonzon see patients?
- Medicare's clinician data lists 3 practice locations, including Brooklyn, NY and Bronx, NY. Call before your visit to confirm the address.
- What is Gian A. Leonzon's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Gian A. Leonzon accept Medicare assignment?
- Medicare's clinician data says Gian A. Leonzon may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Gian A. Leonzon offer telehealth?
- Medicare's clinician data says Gian A. Leonzon offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Gian A. Leonzon?
- (718) 622-2000, as listed in official Medicare / NPI Registry data.
- What is Gian A. Leonzon's NPI number?
- 1306392246. 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 Gian A. Leonzon is enrolled with Medicare (CMS data updated 2026-10-02).
- 300 Flatbush AveBrooklyn, NY 11217 (718) 622‑2000
- 300 Flatbush Ave, Brooklyn Center for Psychotherapy IncBrooklyn, NY 11217
- 579 Courtlandt AveBronx, NY 10451 (718) 485‑2100
Group practices
Medicare enrollment lists Gian A. Leonzon as a member of these groups (CMS data updated 2026-10-02).
- New York Psychotherapy and Counseling Center119 clinicians in the group
- Brooklyn Center for Psychotherapy, Inc.5 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Brooklyn
Clinicians with the same Medicare primary specialty in Brooklyn, NY — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1306392246 |
| 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