Gregory Martinez, M.D.
NPI 1982863098ActiveIndividual· Internal Medicine, Nephrology· Fresno, CA
Internal Medicine, Nephrology (M.D.) in Fresno, California, trained at Jefferson Medical College of Thomas Jefferson University (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $620,495 for 2,008 claims, against $345,240 paid for services in 2024. Amgen Inc. was the largest of 13 companies reporting payments in 2025, $823.35 in all, mostly food and beverage.
Overview
| NPI | 1982863098 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 4, 2008 |
| Last updated in NPPES | Aug 15, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A103241 | CA |
| Internal Medicine | 207R00000X | A103241 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 878 |
|---|---|
| Services billed | 21,775 across 70 procedure codes |
| Paid by Medicare | $345,240 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,008 · 4,899 30-day fills |
|---|---|
| Patients | 463 |
| Total drug cost | $620,495 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | Jefferson Medical College of Thomas Jefferson University |
|---|---|
| Graduation year | 2006 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Central California Faculty Medical Group IncFresno, CA · 265 clinicians
- The Nephrology Group IncFresno, CA · 51 clinicians
Hospital affiliations
- Clovis Community Medical CenterClovis, CA
- Community Regional Medical CenterFresno, CA
- Saint Agnes Medical CenterFresno, CA
Other facilities
- Community Dialysis CenterDialysis facility · Fresno, CA
- Davita Herndon DialysisDialysis facility · Fresno, CA
- Davita North Madera DialysisDialysis facility · Madera, CA
- Fresenius Medical Care Fresno Airport EastDialysis facility · Fresno, CA
- Kerman Dialysis Center, LLCDialysis facility · Kerman, CA
Industry payments (Open Payments)
- 2025$823.35 · 45 payments from 13 companies
- 2024$1,266 · 64 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $240.18 | 16 |
| Travere Therapeutics, Inc. | $116.81 | 6 |
| Otsuka America Pharmaceutical, Inc. | $99.51 | 4 |
| Bayer Healthcare Pharmaceuticals Inc. | $97.79 | 5 |
| Akebia Therapeutics Inc | $66.67 | 3 |
What the 2025 payments were for
- Food and Beverage$823.35 · 45 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 42 nephrologists in Fresno · All nephrologists in California