Quick answers
- Which hospitals does Mark R. Fleckner work at?
- Medicare's official clinician data lists Mark R. Fleckner at 1 hospital: Mercy Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark R. Fleckner see patients?
- Medicare's clinician data lists 2 practice locations, including Garden City, NY and Fresh Meadows, NY. Call before your visit to confirm the address.
- What is Mark R. Fleckner's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Mark R. Fleckner accept Medicare assignment?
- Yes. Medicare's clinician data says Mark R. Fleckner 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 Mark R. Fleckner?
- (516) 739-5905, as listed in official Medicare / NPI Registry data.
- What is Mark R. Fleckner's NPI number?
- 1225063274. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark R. Fleckner works
Medicare's Facility Affiliation Data lists Mark R. Fleckner at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Medical CenterRockville Centre, NY · Acute Care Hospital · CCN 330259
Practice locations
Addresses where Mark R. Fleckner is enrolled with Medicare (CMS data updated 2026-10-02).
- 520 Franklin Ave, Suite 123Garden City, NY 11530 (516) 739‑5905
- 6134 188th St, Suite 218Fresh Meadows, NY 11365 (718) 454‑7700
Group practices
Medicare enrollment lists Mark R. Fleckner as a member of this group (CMS data updated 2026-10-02).
- Mark Fleckner M.D., P.C.2 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Garden City
Clinicians with the same Medicare primary specialty in Garden City, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Duke University School Of Medicine |
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225063274 |
| 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