Eric Guerrero Adiarte, M.D.
Obstetrics & Gynecology Physician · San Marcos, CA
Eric Guerrero Adiarte, M.D. is an obstetrics & gynecology physician with a practice address in San Marcos, California, and NPI 1902038284, issued on Aug 20, 2009. Check the license (California A125682, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Eric Guerrero Adiarte
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- A125682 CA
ML60093358 WA
Self-reported in NPPES; status is on the state search - Practice location
- 400 Craven RD, San Marcos, CA 92078
- Phone
- (619) 528-5000
- Enumerated
- Aug 20, 2009
- Record last updated
- Nov 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 400 Craven RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tracy Abrams, R.N.Registered Nurse1073991261
- Shreya Aiyar, MDPediatrics Physician1922685981
- Najlaa Al-Jibouri, PHARM DPharmacist1447438965
- Jennifer Alexander, RCP, RRTPulmonary Function Technologist Certified Respiratory Therapist1023596442
- Marisa Alunni, M.D.Obstetrics & Gynecology Physician1710298476
- Juan Alvergue, M.D.Cardiovascular Disease Physician1346351517
Verify Eric Guerrero Adiarte in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A125682Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
81 Medicare Part D claims for 34 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 25% of claims.
Most prescribed
- Betamethasone Diprop Augmented15 claims
- Climara12 claims
- Estradiol11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Eric Guerrero Adiarte among 5,088 obstetrics & gynecology physician records in California
Eric Guerrero Adiarte, M.D. is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 66% of them.
- NPI issued2009 · 66% of these records are older, 30% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2021 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in San Marcos → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Marisa Alunni, M.D.San Marcos, CA 920781710298476
- Alethea Bernstein, M.D.San Marcos, CA 920781407990716
- Jorge Calderon, M.D.San Marcos, CA 920781407800881
- Radmila Kazanegra, M.D.San Marcos, CA 920781437277118
- Susanne KlaudtSan Marcos, CA 920781174608749
- Amber Knight, MDSan Marcos, CA 920781184989386
- George Kung, M.D.San Marcos, CA 920781134272891
- Stephanie Smith, DOSan Marcos, CA 920781811276629
Common questions
What is Eric Guerrero Adiarte, M.D.'s NPI number?
Eric Guerrero Adiarte, M.D.'s National Provider Identifier (NPI) is 1902038284, issued on Aug 20, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Eric Guerrero Adiarte, M.D. located?
The NPPES record lists a practice address at 400 Craven RD, San Marcos, CA, 92078. Phone: (619) 528-5000. Providers update this record themselves, so call before visiting.
How can I verify Eric Guerrero Adiarte, M.D.'s license?
NPPES lists California license number A125682, 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.
How much does Eric Guerrero Adiarte, M.D. prescribe under Medicare Part D?
In 2024, Eric Guerrero Adiarte, M.D. had 81 Medicare Part D claims for 34 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
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.