Guillermo J. Valenzuela, MD
Maternal & Fetal Medicine Physician · Colton, CA
Guillermo J. Valenzuela, MD is a maternal & fetal medicine physician with a practice address in Colton, California, and NPI 1730263484, issued on Oct 25, 2006. Check the license (California A38671, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Guillermo J. Valenzuela
- Credential
- MD
- Primary taxonomy
- Maternal & Fetal Medicine Physician 207VM0101X
- License number
- A38671 CA
Self-reported in NPPES; status is on the state search - Practice location
- 400 N Pepper Ave, Colton, CA 92324
- Phone
- (909) 580-6333
- Enumerated
- Oct 25, 2006
- Record last updated
- May 29, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (909) 580-3289
- Medicare enrollment
- Enrolled (PECOS I20090729000689); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest maternal & fetal medicine physician records → All 343 in California → Look up another NPI →
Also registered at 400 N Pepper Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shangrila AbaricoRegistered Nurse1609659325
- Susana AbaroRegistered Nurse1114425162
- Patricia AbbaRegistered Nurse1013188838
- Mohammad Hossein Abbasi, MD, MPHStudent in an Organized Health Care Education/Training Program1609622166
- Ala AbedrabboCertified Registered Nurse Anesthetist1972333144
- Mary AboagyeLicensed Vocational Nurse1982875605
Verify Guillermo J. Valenzuela in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A38671Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $71.74
4 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 784 providers of this specialty with any payment received $1,252.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Valley Obstetrics And Gynecology Medical Group IncColton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Guillermo J. Valenzuela among 343 maternal & fetal medicine physician records in California
Guillermo J. Valenzuela, MD is one of 343 maternal & fetal medicine physician records with a practice address in California. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 52% newer
- In a Medicare fileYes · 61% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1974 · median 2003 among the 181 with a school on file
- Record last updated2020 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VM0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Maternal & Fetal Medicine Physician providers in California
There are 343 maternal & fetal medicine physician records in California.
All 343 in California → Every provider in Colton → Maternal & Fetal Medicine Physician nationwide →
The 8 maternal & fetal medicine physician records with the nearest ZIP codes
- Dotun Ogunyemi, MDColton, CA 923241619078532
- James Betoni, D.O.Loma Linda, CA 923541477530715
- Eric Hodgson, MDPalm Springs, CA 922621689891673
- Harbinder Brar, M.D. INCRiverside, CA 925061699700971
- Tracey Deyoung, MDSan Diego, CA 921341609269422
- Michael Miller, M.D.San Diego, CA 921341649683855
- Stacey Schmiedecke, M.D.San Diego, CA 921341124392741
- Jennifer Ahn, M.D.San Diego, CA 921301972673879
Common questions
What is Guillermo J. Valenzuela, MD's NPI number?
Guillermo J. Valenzuela, MD's National Provider Identifier (NPI) is 1730263484, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Guillermo J. Valenzuela, MD located?
The NPPES record lists a practice address at 400 N Pepper Ave, Colton, CA, 92324. Phone: (909) 580-6333. Providers update this record themselves, so call before visiting.
How can I verify Guillermo J. Valenzuela, MD's license?
NPPES lists California license number A38671, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.