Quick answers
- Where does John K. Maesaka see patients?
- Medicare's clinician data lists 2 practice locations, including New York, NY and Mineola, NY. Call before your visit to confirm the address.
- What is John K. Maesaka's specialty?
- Medicare lists Nephrology as the primary specialty.
- Does John K. Maesaka accept Medicare assignment?
- Yes. Medicare's clinician data says John K. Maesaka 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 John K. Maesaka?
- (212) 263-9700, as listed in official Medicare / NPI Registry data.
- What is John K. Maesaka's NPI number?
- 1417911686. 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 John K. Maesaka is enrolled with Medicare (CMS data updated 2026-10-02).
- 111 BroadwayNew York, NY 10006 (212) 263‑9700
- 297 Mineola BlvdMineola, NY 11501 (516) 294‑1377
Group practices
Medicare enrollment lists John K. Maesaka as a member of this group (CMS data updated 2026-10-02).
- New York University6,134 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in New York
Clinicians with the same Medicare primary specialty in New York, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Boston University School Of Medicine |
| Graduation year | 1961 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417911686 |
| 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