Gervacio D. Diaz, M.D.
Internal Medicine Physician · Modesto, CA
Gervacio D. Diaz, M.D. is an internal medicine physician with a practice address in Modesto, California, and NPI 1700835451, issued on May 9, 2006. Check the license (California A69801, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gervacio D. Diaz
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A69801 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2013 Coffee RD, Modesto, CA 95355
- Phone
- (209) 529-8506
- Enumerated
- May 9, 2006
- Record last updated
- Mar 13, 2023
- Fax
- (209) 529-8524
- Medicare enrollment
- Enrolled (PECOS I20061214000411); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Gervacio D. Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A69801Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.2 times the Medicare Part D claims of the average internal medicine physician in 2024
13,392 Medicare Part D claims for 677 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 682 claims were for opioids.
Most prescribed
- Atorvastatin Calcium834 claims
- Amlodipine Besylate753 claims
- Losartan Potassium561 claims
- Metformin Hcl480 claims
- Lisinopril454 claims
- Levothyroxine Sodium413 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,005.06
57 payments; by number, the most common kind was food and beverage; the largest payer was Sumitomo Pharma America, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Sutter Valley Medical FoundationModesto, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gervacio D. Diaz among 17,696 internal medicine physician records in California
Gervacio D. Diaz, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1988 · median 2004 among the 11,065 with a school on file
- Record last updated2023 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
129 internal medicine physician records list a practice address in Modesto
They are 129 of the 9,262 NPPES records with a practice address in Modesto, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Modesto → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Edward Auen, PH.D., M.D.Modesto, CA 953551962464602
- Veronica David, MDModesto, CA 953551427014877
- Neal Dunitz, M.D.Modesto, CA 953551245215870
- Maria Go, MDModesto, CA 953551922095132
- Richard Holihan, MDModesto, CA 953551730146184
- Kenneth Hua, MDModesto, CA 953551609824382
- Youhana Jacobs, MDModesto, CA 953551396793717
- James Kruer, MDModesto, CA 953551457317919
Common questions
What is Gervacio D. Diaz, M.D.'s NPI number?
Gervacio D. Diaz, M.D.'s National Provider Identifier (NPI) is 1700835451, issued on May 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gervacio D. Diaz, M.D. located?
The NPPES record lists a practice address at 2013 Coffee RD, Modesto, CA, 95355. Phone: (209) 529-8506. Providers update this record themselves, so call before visiting.
How can I verify Gervacio D. Diaz, M.D.'s license?
NPPES lists California license number A69801, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gervacio D. Diaz, M.D. prescribe under Medicare Part D?
In 2024, Gervacio D. Diaz, M.D. had 13,392 Medicare Part D claims for 677 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.