Quick answers
- Where does John Gregg see patients?
- Medicare's clinician data lists 2 practice locations, including Berkeley Heights, NJ and Hamilton Township, NJ. Call before your visit to confirm the address.
- What is John Gregg's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does John Gregg accept Medicare assignment?
- Yes. Medicare's clinician data says John Gregg 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 Gregg?
- (908) 273-4300, as listed in official Medicare / NPI Registry data.
- What is John Gregg's NPI number?
- 1013118660. 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 Gregg is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Diamond Hill RdBerkeley Heights, NJ 07922 (908) 273‑4300
- 1085 Whitehorse Mercerville RdHamilton Township, NJ 08610 (215) 648‑9000
Group practices
Medicare enrollment lists John Gregg as a member of these groups (CMS data updated 2026-10-02).
- Summit Medical Group PA1,212 clinicians in the group
- Jersey Irish Medical33 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Berkeley Heights
Clinicians with the same Medicare primary specialty in Berkeley Heights, NJ — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1013118660 |
| 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