Jose J. Diaz, M.D.
Emergency Medicine Physician · Chino, CA
Jose J. Diaz, M.D. is an emergency medicine physician with a practice address in Chino, California, and NPI 1306880836, issued on Jun 15, 2006. Check the license (California A64744, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jose J. Diaz
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A64744 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5451 Walnut Ave, Chino, CA 91710
- Phone
- (909) 464-8667
- Enumerated
- Jun 15, 2006
- Record last updated
- Nov 16, 2022
- Medicaid ID
- 00A647440 CA
- Medicare enrollment
- Enrolled (PECOS I20040223001162); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 5451 Walnut Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ashraf Abdel-KerimEmergency Medicine Physician1396961538
- Udhaya AeletyFamily Medicine Physician1740815943
- Ahmet AhmadiStudent in an Organized Health Care Education/Training Program1043199532
- Brian Ahn, D.O.Student in an Organized Health Care Education/Training Program1265849749
- Randall Allred, D.O.Student in an Organized Health Care Education/Training Program1629427703
- Harikrishna Ambati, MDFamily Medicine Physician1154998730
Verify Jose J. Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A64744Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
50% more Medicare Part D claims than the average emergency medicine physician in 2024
338 Medicare Part D claims for 202 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims. 84 claims were for opioids.
Most prescribed
- Tramadol Hcl67 claims
- Prednisone34 claims
- Naproxen31 claims
- Cephalexin20 claims
- Nitrofurantoin Mono-Macro17 claims
- Hydrocodone-Acetaminophen16 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.
Bills Medicare through one group practice
- Chino Emergency Medical Associates, Inc.Chino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jose J. Diaz among 7,751 emergency medicine physician records in California
Jose J. Diaz, M.D. is one of 7,751 emergency medicine physician records with a practice address in California. 81% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1996 · median 2011 among the 4,560 with a school on file
- Record last updated2022 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
14 emergency medicine physician records list a practice address in Chino
They are 14 of the 1,097 NPPES records with a practice address in Chino, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Chino → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Ashraf Abdel-KerimChino, CA 917101396961538
- Michael CaoChino, CA 917101649638628
- Martin Carrillo, M.D.Chino, CA 917101861436339
- Douglas Cochrane, M.D.Chino, CA 917101417991811
- Pranav Kachhi, M.D.Chino, CA 917101801836606
- Khoa Luong, D.O.Chino, CA 917101649253691
- Ashok Madahar, M.D.Chino, CA 917101902846710
- Jason Mathews, DOChino, CA 917101316353865
Common questions
What is Jose J. Diaz, M.D.'s NPI number?
Jose J. Diaz, M.D.'s National Provider Identifier (NPI) is 1306880836, issued on Jun 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jose J. Diaz, M.D. located?
The NPPES record lists a practice address at 5451 Walnut Ave, Chino, CA, 91710. Phone: (909) 464-8667. Providers update this record themselves, so call before visiting.
How can I verify Jose J. Diaz, M.D.'s license?
NPPES lists California license number A64744, 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 Jose J. Diaz, M.D. prescribe under Medicare Part D?
In 2024, Jose J. Diaz, M.D. had 338 Medicare Part D claims for 202 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.