Quick answers
- Where does John T. Leffers see patients?
- Medicare's clinician data lists 4 practice locations, including Cranston, RI, Seekonk, MA and North Providence, RI. Call before your visit to confirm the address.
- What is John T. Leffers's specialty?
- Medicare lists Optometry as the primary specialty.
- Does John T. Leffers accept Medicare assignment?
- Medicare's clinician data says John T. Leffers may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for John T. Leffers?
- (401) 463-6696, as listed in official Medicare / NPI Registry data.
- What is John T. Leffers's NPI number?
- 1235369349. 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 T. Leffers is enrolled with Medicare (CMS data updated 2026-10-02).
- 1400 Oaklawn AveCranston, RI 02920 (401) 463‑6696
- 15 Highland AveSeekonk, MA 02771 (508) 336‑4096
- 1875 Mineral Spring AveNorth Providence, RI 02904 (401) 353‑3200
- 435 State RdDartmouth, MA 02747 (508) 996‑3364
Group practices
Medicare enrollment lists John T. Leffers as a member of these groups (CMS data updated 2026-10-02).
- Mass Optometric Associates, PLLC52 clinicians in the group
- Rhode Island Optometrics LLC9 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Cranston
Clinicians with the same Medicare primary specialty in Cranston, RI — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1235369349 |
| 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