Dr. Gregory S. Martinez, MD
- Medicare services, 2024
- 10,870
- Medicare patients, 2024
- 878
- Part D claims, 2024
- 2,008
- Hospital affiliations
- 3
- Industry payments
- $2,089
- Practice address
- 568 E Herndon Ave, Fresno, CA 93720
- Practice phone
- Call (559) 431-0066
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Fresno Ambulatory Surgery Center
Surgery Center - Medicare-Certified · Fresno, California
Find Dr. Martinez's professional email, personal email and mobile number
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Dr. Gregory S. Martinez is a nephrologist in Fresno, California
Dr. Martinez practices at Fresno Ambulatory Surgery Center in Fresno, California.
Dr. Martinez's NPI, 1982863098, was assigned on June 4, 2008. Dr. Martinez graduated from Sidney Kimmel Medical College in 2006. Dr. Martinez's California license number on file is A103241.
- NPI
- 1982863098NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2264602564
- NPI enumeration date
- June 4, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (559) 431-0066
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory S. Martinez practices at Fresno Ambulatory Surgery Center in Fresno, California
Dr. Martinez's primary practice is Fresno Ambulatory Surgery Center, at 568 E Herndon Ave, Fresno, CA 93720. The practice phone is (559) 431-0066.
- Fresno Ambulatory Surgery Center568 E Herndon Ave, Fresno, CA 93720Phone(559) 431-0066
Source: Dmand AI Affiliation Data
Dr. Gregory S. Martinez is affiliated with 12 sites of care and 3 medical groups
Dr. Martinez's primary practice is Fresno Ambulatory Surgery Center in Fresno, California. Dr. Martinez is also affiliated with Community Regional Medical Center. The medical group on file is The Nephrology Group, Inc. Dmand AI also links Dr. Martinez to 2 more hospitals, 5 dialysis centers, 3 group practices and clinics and 2 medical groups, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory S. Martinez's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Martinez practices, 12 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Fresno Ambulatory Surgery Center | Available with a free account |
| +11 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory S. Martinez is one of 1,401 nephrologists in California
Nephrology is Dr. Martinez's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Martinez is board certified in nephrology by the American Board of Internal Medicine. Dr. Martinez has a license on file in California.
Specialties and state licenses
- Nephrology, CaliforniaPrimary
Clinical focus
Dmand AI lists acute kidney failure, chronic kidney disease and fluid and electrolyte imbalances among the conditions Dr. Martinez treats.
Nephrologists near Dr. Martinez
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory S. Martinez billed Medicare for 10,870 services in 2024
CMS data shows 10,870 Medicare services from Dr. Martinez across 34 procedure codes in 2024, for 878 Medicare patients. Medicare paid $302,185 for them.
Dr. Martinez's Medicare services by type, 2024
- Lab and pathology4,331
- Drugs given in the office3,552
- Office and hospital visits1,702
- Surgery617
- Tests and treatments610
- Imaging57
Where Dr. Martinez's Medicare services took place, 2024
- In an office9,89891%
- In a facility9719%
Dr. Martinez compared with the California median for nephrologists, 2024
- Dr. Martinez
- California median
- Medicare services
- 10,870vs 1,08410.0 times
- Medicare patients
- 878vs 3072.9 times
- Part D claims
- 1,844vs 95593% above
Medians across 1,355 nephrologists in California with Dmand AI profiles that report each measure.
Dr. Martinez's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Martinez?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Martinez and other nephrologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory S. Martinez treated 878 Medicare patients in 2024, average age 72
CMS counts 878 Medicare patients who saw Dr. Martinez in 2024. The largest group is 75 to 84, with 304 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 48% are also on Medicaid. Their average risk score is 4.06, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Martinez's median patient age at 69, with 48% women.
Dr. Martinez's Medicare patients by age, 2024
Dr. Martinez's Medicare patients by sex, 2024
- Women41948%
- Men45952%
Chronic conditions among Dr. Martinez's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes71%
- Ischemic heart disease53%
- Heart failure48%
- Arthritis45%
- Atrial fibrillation30%
Share of Medicare patients with each condition. A patient can have several.
Dr. Martinez's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory S. Martinez wrote 2,008 Medicare Part D claims in 2024
In 2024, Dr. Martinez wrote 2,008 Medicare Part D claims for 463 patients. 78% of them were for generic drugs. CMS names the drug for 1,844 of them, across 37 drugs with 11 or more claims each, at $584,130 in total drug cost.
Dr. Martinez's Part D claims by kind of drug, 2024
- Generic1,564 claims78%
- Brand-name and other444 claims22%
Dr. Martinez's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Martinez's Part D claims, 2024
- Antibiotics2%49 of 2,008 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Gregory S. Martinez offers telehealth to Medicare patients
Dr. Martinez accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Martinez as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Gregory S. Martinez received $2,089 in industry payments from 2024 to 2025
CMS Open Payments shows 107 general payments to Dr. Martinez from 18 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Amgen Inc. paid the most, $533.
General payments to Dr. Martinez by program year, 2024 to 2025
Companies that paid Dr. Martinez the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory S. Martinez graduated from Sidney Kimmel Medical College
Dr. Martinez graduated from Sidney Kimmel Medical College in 2006.
- Medical school
- Board certified in nephrology
Source: Dmand AI Professional Profile Data
Dr. Gregory S. Martinez accepts plans from 17 insurance carriers
Dr. Martinez is in network with 17 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- United Healthcare
- Elevance
- HCSC
- Kaiser Permanente
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- +9 more carriersWith a free account
Plan types Dr. Martinez accepts, by number of carriers
- PPO9
- HMO8
- Medicare8
- EPO5
- POS5
Source: Dmand AI Insurance Network Data
Sources for Dr. Gregory S. Martinez's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gregory S. Martinez
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gregory S. Martinez's NPI number?
Dr. Gregory S. Martinez's NPI number is 1982863098. It was assigned on June 4, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory S. Martinez?
Dr. Gregory S. Martinez is a nephrologist in Fresno, California. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. Gregory S. Martinez practice?
Dr. Martinez practices at 568 E Herndon Ave, Fresno, CA 93720. Dr. Martinez's primary practice is Fresno Ambulatory Surgery Center in Fresno, California. Dmand AI also links Dr. Martinez to 2 hospitals, 5 dialysis centers, 3 group practices and clinics and 2 medical groups.
What is Dr. Gregory S. Martinez's office phone number?
The practice phone on file for Dr. Martinez is (559) 431-0066.
What is Dr. Gregory S. Martinez's medical license number?
Dr. Martinez's California license number on file is A103241.
Which hospitals is Dr. Gregory S. Martinez affiliated with?
Dr. Martinez is affiliated with Community Regional Medical Center. Dmand AI links Dr. Martinez to 2 more hospitals.
What medical group is Dr. Gregory S. Martinez part of?
Dr. Martinez is linked to The Nephrology Group, Inc. Dmand AI links Dr. Martinez to 2 more medical groups.
Does Dr. Gregory S. Martinez accept Medicare?
Yes. CMS data shows Dr. Martinez billed Medicare for 10,870 services in 2024, and Dr. Martinez accepts Medicare assignment.
Does Dr. Gregory S. Martinez offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Martinez as offering telehealth services.
How many Medicare patients does Dr. Gregory S. Martinez see?
CMS counts 878 Medicare patients who saw Dr. Martinez in 2024, with an average age of 72.
Show 7 more questionsShow fewer questions
Is Dr. Gregory S. Martinez board certified?
Yes. Dr. Martinez is board certified in nephrology by the American Board of Internal Medicine.
What services does Dr. Gregory S. Martinez bill to Medicare?
In 2024, Dr. Martinez's most billed Medicare services were injected or infused drug (J0885), hospital inpatient care (99232) and office visit, established patient (99214).
Where did Dr. Gregory S. Martinez go to medical school?
Dr. Martinez graduated from Sidney Kimmel Medical College in 2006.
What drugs does Dr. Gregory S. Martinez prescribe most?
In 2024 Medicare Part D data, Dr. Martinez's most prescribed drugs by claims were Furosemide, Allopurinol and Amlodipine Besylate.
Has Dr. Gregory S. Martinez received payments from drug or device companies?
CMS Open Payments shows $2,089 in general payments to Dr. Martinez from 18 companies from 2024 to 2025. The largest total came from Amgen Inc.
How long has Dr. Gregory S. Martinez been practicing?
Dr. Martinez graduated from medical school in 2006, 20 years ago.
What insurance does Dr. Gregory S. Martinez accept?
Dr. Martinez is in network with 17 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 9. Check the plan with the practice before a visit.
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