Matthew Patrick Diaz, D.O.
Family Medicine Physician · Colton, CA
Matthew Patrick Diaz, D.O. is a family medicine physician with a practice address in Colton, California, and NPI 1235492943, issued on Jun 18, 2012. Check the license (California 20A12957, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Matthew Patrick Diaz
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A12957 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 N Pepper Ave, Colton, CA 92324
- Phone
- (909) 580-1000
- Enumerated
- Jun 18, 2012
- Record last updated
- May 9, 2024
- Medicare enrollment
- Enrolled (PECOS I20150910002105); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 400 N Pepper Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shangrila AbaricoRegistered Nurse1609659325
- Susana AbaroRegistered Nurse1114425162
- Patricia AbbaRegistered Nurse1013188838
- Mohammad Hossein Abbasi, MD, MPHStudent in an Organized Health Care Education/Training Program1609622166
- Ala AbedrabboCertified Registered Nurse Anesthetist1972333144
- Mary AboagyeLicensed Vocational Nurse1982875605
Verify Matthew Patrick Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A12957Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% more Medicare Part D claims than the average family medicine physician in 2024
6,403 Medicare Part D claims for 1,212 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 208 claims were for opioids.
Most prescribed
- Atorvastatin Calcium562 claims
- Amlodipine Besylate276 claims
- Losartan Potassium235 claims
- Lisinopril212 claims
- Rosuvastatin Calcium198 claims
- Levothyroxine Sodium197 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
- Southern California Permanente Medical GroupChino, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Matthew Patrick Diaz among 17,133 family medicine physician records in California
Matthew Patrick Diaz, D.O. is one of 17,133 family 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 2012, is newer than 66% of them.
- NPI issued2012 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2012 · median 2005 among the 10,652 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
76 family medicine physician records list a practice address in Colton
They are 76 of the 2,459 NPPES records with a practice address in Colton, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Colton → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Ruben Avagimov, MDColton, CA 923241558376947
- Luis Chaname, D.O.Colton, CA 923241992712830
- Rosa Cortes, M.D.Colton, CA 923241154338010
- Emily Ebert, M.D., M.P.H.Colton, CA 923241730194127
- James Evans, M.D.Colton, CA 923241104858059
- Pooja Gupta, DOColton, CA 923241497762355
- Edward Keiderling, MDColton, CA 923241457366841
- Kuang-Chih Lo, D.O.Colton, CA 923241689617904
Common questions
What is Matthew Patrick Diaz, D.O.'s NPI number?
Matthew Patrick Diaz, D.O.'s National Provider Identifier (NPI) is 1235492943, issued on Jun 18, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Patrick Diaz, D.O. located?
The NPPES record lists a practice address at 400 N Pepper Ave, Colton, CA, 92324. Phone: (909) 580-1000. Providers update this record themselves, so call before visiting.
How can I verify Matthew Patrick Diaz, D.O.'s license?
NPPES lists California license number 20A12957, 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 Matthew Patrick Diaz, D.O. prescribe under Medicare Part D?
In 2024, Matthew Patrick Diaz, D.O. had 6,403 Medicare Part D claims for 1,212 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.