Gabriela Diaz Sullivan, MD
Internal Medicine Physician · Martinez, CA
Gabriela Diaz Sullivan, MD is an internal medicine physician with a practice address in Martinez, California, and NPI 1275620023, issued on Oct 5, 2006. Check the license (California A77056, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gabriela Diaz Sullivan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A77056 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Alhambra Avenue, Martinez, CA 94553
- Phone
- (925) 370-5110
- Enumerated
- Oct 5, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (925) 370-5142
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2500 Alhambra Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aneela Ahmed, MDPsychiatry Physician1568545317
- Fred Beck, MDFamily Medicine Physician1447348891
- Christina Berger, NPFamily Nurse Practitioner1821157959
- Ruben Caballero, NPFamily Nurse Practitioner1891870879
- Frank Camodeca, DDSDentist1366539116
- James Carpenter, MD MPHPediatrics Physician1679643589
Verify Gabriela Diaz Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A77056Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average internal medicine physician in 2024
651 Medicare Part D claims for 50 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 23 claims were for opioids.
Most prescribed
- Amlodipine Besylate36 claims
- Metoprolol Succinate30 claims
- Losartan Potassium25 claims
- Methimazole25 claims
- Metformin Hcl24 claims
- Zolpidem Tartrate23 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.
Gabriela Diaz Sullivan among 17,696 internal medicine physician records in California
Gabriela Diaz Sullivan, MD 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 fileNo · 63% of these records are
- Record last updated2007 · 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).
48 internal medicine physician records list a practice address in Martinez
They are 48 of the 1,816 NPPES records with a practice address in Martinez, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Martinez → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Chapman, MDMartinez, CA 945531578548129
- George Chuang, DOMartinez, CA 945531235217324
- Jeremy Fish, MDMartinez, CA 945531952497943
- Thomas Gamsky, MDMartinez, CA 945531043296247
- Gerhard Heinrich, M.D.Martinez, CA 945531306828728
- Nancy Lazarus, M.D.Martinez, CA 945531073598223
- Sara Levin, MDMartinez, CA 945531184707853
- Brian O'Neill, M.D.Martinez, CA 945531366425985
Common questions
What is Gabriela Diaz Sullivan, MD's NPI number?
Gabriela Diaz Sullivan, MD's National Provider Identifier (NPI) is 1275620023, issued on Oct 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gabriela Diaz Sullivan, MD located?
The NPPES record lists a practice address at 2500 Alhambra Avenue, Martinez, CA, 94553. Phone: (925) 370-5110. Providers update this record themselves, so call before visiting.
How can I verify Gabriela Diaz Sullivan, MD's license?
NPPES lists California license number A77056, 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 Gabriela Diaz Sullivan, MD prescribe under Medicare Part D?
In 2024, Gabriela Diaz Sullivan, MD had 651 Medicare Part D claims for 50 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.