Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Warren Toshiro Yamashita, MD, MPH

Individual provider Addiction Medicine (Family Medicine) Physician · NPI 1982137691

Warren Toshiro Yamashita, MD, MPH is registered under Family Practice in Tustin, California. Graduated from University of Southern California Keck School of Medicine in 2017, 9 years ago. Practices with Harbor Community Clinic Inc, a 16-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
9
Trained at
University of Southern California Keck School of Medicine
Licensed in
CA
In the registry since
2017
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
MPH — Master of Public Health
A graduate degree in population health.

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Practice location Address checks out

1 Hope Dr
Tustin, CA 92782-0221
Phone: (714) 247-0300
Fax: (714) 259-1598
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 947 S Anaheim Blvd Ste 260, Anaheim, CA 92805-5591 — (714) 247-0300
  • 1100b N Tustin Ave Ste A, Santa Ana, CA 92705-3505 — (714) 247-0300
  • 14642 Newport Ave Ste 200, Tustin, CA 92780-6058 — (714) 247-0300

Specialties & licences

Addiction Medicine (Family Medicine) Physician (primary) Taxonomy 207QA0401X · Licence A167101 (CA)

Record details

NPI number1982137691
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , MPH
Sole proprietorNo
NPI enumeratedApril 10, 2017
Last updated in NPPESMay 5, 2022
Certification dateMay 5, 2022

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF SOUTHERN CALIFORNIA KECK SCHOOL OF MEDICINE
Graduated 2017 (9 years in practice)
Group practice Harbor Community Clinic Inc — 16 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 $807 32 payments · 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 Harbor Community Clinic Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 16 clinicians in the practice; 12 are shown here.

Other providers in Tustin