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

Dr. Guillermo J Valenzuela, MD

Individual provider Maternal & Fetal Medicine Physician · NPI 1730263484

Dr. Guillermo J Valenzuela, MD is an Obstetrics/Gynecology in Colton, California. Qualified in 1974, 52 years ago. Practices with Valley Obstetrics and Gynecology Medical Group Inc, a 9-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
52
Licensed in
CA
In the registry since
2006
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

400 N Pepper Ave Mob 206
Colton, CA 92324-1801
Phone: (909) 580-6333
Fax: (909) 580-3289
Show map & directions

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

Specialties & licences

Maternal & Fetal Medicine Physician (primary) Taxonomy 207VM0101X · Licence A38671 (CA)

Record details

NPI number1730263484
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 25, 2006
Last updated in NPPESMay 29, 2020
Certification dateMay 29, 2020

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolOTHER
Graduated 1974 (52 years in practice)
Group practice Valley Obstetrics And Gynecology Medical Group Inc — 9 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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