Matthew Diaz, D.O.
NPI 1235492943 · Family Medicine Physician · Colton, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Matthew Diaz, D.O. is a Family Medicine Physician provider in Colton, CA (NPI 1235492943).
Provider details
- NPI number
- 1235492943
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A12957 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
14 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 106 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 562 | 243 |
| Amlodipine Besylate | 276 | 127 |
| Losartan Potassium | 235 | 106 |
| Lisinopril | 212 | 101 |
| Rosuvastatin Calcium | 198 | 85 |
| Levothyroxine Sodium | 197 | 87 |
| Metformin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2012-06-18
- Last updated
- 2024-05-09
- Certified
- 2024-05-09
Frequently asked questions
- What is Matthew Diaz's NPI number?
- Matthew Diaz's National Provider Identifier (NPI) is 1235492943, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Matthew Diaz's specialty?
- Matthew Diaz is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Matthew Diaz located?
- Matthew Diaz's practice location on file with NPPES is 400 N Pepper Ave, Colton, CA 92324-1801.
- What is Matthew Diaz's phone number?
- The practice phone number listed in the NPPES registry for Matthew Diaz is (909) 580-1000.
- Does Matthew Diaz accept Medicare?
- Matthew Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Matthew Diaz's NPI active?
- Yes — Matthew Diaz's NPI (1235492943) is active in the NPPES registry as of the last update on 2024-05-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.