Gustavo Diaz, MD
NPI 1538122635 · Emergency Medicine Physician · Redwood City, CA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gustavo Diaz, MD is a Emergency Medicine Physician provider in Redwood City, CA (NPI 1538122635).
Provider details
- NPI number
- 1538122635
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- C54872 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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.
Practice location
Mailing address
Additional practice locations (1)
- 615 Ocean St # E1Santa Cruz, CA 95060-4005Phone: (831) 425-7991Fax: (831) 425-7346
Registry dates
- Enumerated
- 2006-04-10
- Last updated
- 2026-03-16
- Certified
- 2026-03-16
Frequently asked questions
- What is Gustavo Diaz's NPI number?
- Gustavo Diaz's National Provider Identifier (NPI) is 1538122635, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gustavo Diaz's specialty?
- Gustavo Diaz is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gustavo Diaz located?
- Gustavo Diaz's practice location on file with NPPES is 830 Jefferson Ave, Redwood City, CA 94063-1804.
- What is Gustavo Diaz's phone number?
- The practice phone number listed in the NPPES registry for Gustavo Diaz is (650) 381-0616.
- Does Gustavo Diaz accept Medicare?
- Gustavo Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gustavo Diaz's NPI active?
- Yes — Gustavo Diaz's NPI (1538122635) is active in the NPPES registry as of the last update on 2026-03-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.