Alejandro Diaz, MD
NPI 1437591104 · Internal Medicine Physician · Oakland, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alejandro Diaz, MD is a Internal Medicine Physician provider in Oakland, CA (NPI 1437591104).
Provider details
- NPI number
- 1437591104
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 132627 (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
12 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 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 109 | 35 |
| Amlodipine Besylate | 68 | 21 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 42 | 14 |
| Lisinopril | 41 | 14 |
| Famotidine | 33 | 11 |
| Metformin Hcl | 32 | — |
| Omeprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-07-23
- Last updated
- 2016-04-13
Frequently asked questions
- What is Alejandro Diaz's NPI number?
- Alejandro Diaz's National Provider Identifier (NPI) is 1437591104, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alejandro Diaz's specialty?
- Alejandro Diaz is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Alejandro Diaz located?
- Alejandro Diaz's practice location on file with NPPES is 1411 E 31st St, Oakland, CA 94602-1018.
- What is Alejandro Diaz's phone number?
- The practice phone number listed in the NPPES registry for Alejandro Diaz is (510) 437-4887.
- Does Alejandro Diaz accept Medicare?
- Alejandro Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alejandro Diaz's NPI active?
- Yes — Alejandro Diaz's NPI (1437591104) is active in the NPPES registry as of the last update on 2016-04-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.