Quick answers
- Where does Mark Hershowitz see patients?
- Medicare's clinician data lists 2 practice locations, including Hamilton, NY and Watertown, NY. Call before your visit to confirm the address.
- What is Mark Hershowitz's specialty?
- Medicare lists Optometry as the primary specialty, and also Ophthalmology.
- Does Mark Hershowitz accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Hershowitz 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 Hershowitz?
- (315) 797-8330, as listed in official Medicare / NPI Registry data.
- What is Mark Hershowitz's NPI number?
- 1275530834. 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 Mark Hershowitz is enrolled with Medicare (CMS data updated 2026-10-02).
- 2730 State Route 12bHamilton, NY 13346 (315) 797‑8330
- 53 Public Sq, Suite 102Watertown, NY 13601 (315) 691‑6379
Group practices
Medicare enrollment lists Mark Hershowitz as a member of this group (CMS data updated 2026-10-02).
- Costello Eye Physicians and Surgeons PLLC8 clinicians in the group
Specialties
- Optometryprimary
- Ophthalmologyalso
Other optometrists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Pennsylvania College Of Optometry |
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1275530834 |
| 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