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

Gregory H. Shimizu, MD

Individual provider Internal Medicine Physician · NPI 1154492130

Gregory H. Shimizu, MD is an Internal Medicine in Fontana, California. Graduated from George Washington University School of Medicine in 1988, 38 years ago. Practices with Temecula Valley Hospitalist Medical Group Inc, a 26-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
38
Trained at
George Washington University School of Medicine
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

9961 Sierra Ave
Fontana, CA 92335-6720
Phone: (909) 427-3910
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence G67137 (CA)

Record details

NPI number1154492130
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 13, 2006
Last updated in NPPESSeptember 23, 2008

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolGEORGE WASHINGTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 1988 (38 years in practice)
Group practice Temecula Valley Hospitalist Medical Group Inc — 26 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Fontana