Quick answers
- Which hospitals does Gregory S. Martinez work at?
- Medicare's official clinician data lists Gregory S. Martinez at 3 hospitals: Clovis Community Medical Center, Community Regional Medical Center and Saint Agnes Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory S. Martinez see patients?
- Medicare's clinician data lists 2 practice locations, including Fresno, CA. Call before your visit to confirm the address.
- What is Gregory S. Martinez's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does Gregory S. Martinez accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory S. Martinez 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.
- Does Gregory S. Martinez offer telehealth?
- Medicare's clinician data says Gregory S. Martinez offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Gregory S. Martinez?
- (559) 459-6000, as listed in official Medicare / NPI Registry data.
- What is Gregory S. Martinez's NPI number?
- 1982863098. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory S. Martinez works
Medicare's Facility Affiliation Data lists Gregory S. Martinez at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Clovis Community Medical CenterClovis, CA · Acute Care Hospital · CCN 050492
- Community Regional Medical CenterFresno, CA · Acute Care Hospital · CCN 050060
- Saint Agnes Medical CenterFresno, CA · Acute Care Hospital · CCN 050093
Practice locations
Addresses where Gregory S. Martinez is enrolled with Medicare (CMS data updated 2026-10-02).
- 2823 Fresno StFresno, CA 93721 (559) 459‑6000
- 568 E Herndon AveFresno, CA 93720
Group practices
Medicare enrollment lists Gregory S. Martinez as a member of these groups (CMS data updated 2026-10-02).
- Central California Faculty Medical Group Inc265 clinicians in the group
- The Nephrology Group Inc51 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Fresno
Clinicians with the same Medicare primary specialty in Fresno, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Jefferson Medical College Of Thomas Jefferson University |
| Graduation year | 2006 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1982863098 |
| 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