Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Gustavo A. Diaz, MD

Individual provider Emergency Medicine Physician · NPI 1538122635

Gustavo A. Diaz, MD practises Emergency Medicine in Redwood City, California. Graduated from University of Texas Medical Branch at Galveston in 1982, 44 years ago. Practices with American Current Care of California a Medical Corporation, a 140-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California and Massachusetts.

Years since qualifying
44
Trained at
University of Texas Medical Branch at Galveston
Licensed in
CA, MA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

830 Jefferson Ave
Redwood City, CA 94063-1804
Phone: (650) 381-0616
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 615 Ocean St # E1, Santa Cruz, CA 95060-4005 — (831) 425-7991

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence C54872 (CA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 53006 (MA)

Record details

NPI number1538122635
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 10, 2006
Last updated in NPPESMarch 16, 2026
Certification dateMarch 16, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON
Graduated 1982 (44 years in practice)
Group practice American Current Care Of California A Medical Corporation — 140 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $38 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at American Current Care of California a Medical Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 140 clinicians in the practice; 12 are shown here.

Other providers in Redwood City