Ernestine May Wen, M.D
Obstetrics & Gynecology Physician · Santa Ana, CA
Ernestine May Wen, M.D is an obstetrics & gynecology physician with a practice address in Santa Ana, California, and NPI 1275738049, issued on Jun 20, 2007. Check the license (California A106114, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ernestine May Wen
- Credential
- M.D
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A106114 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1900 E 4TH St, Santa Ana, CA 92705
- Phone
- (714) 967-4792
- Enumerated
- Jun 20, 2007
- 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 1900 E 4TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Gelyan ArevaloMarriage & Family Therapist1871062638
- Claudia ArnoldPharmacist1366981870
- Neely AtamaniukStudent in an Organized Health Care Education/Training Program1275273310
Verify Ernestine May Wen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A106114Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
63% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
61 Medicare Part D claims for 24 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol12 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.
Ernestine May Wen among 5,088 obstetrics & gynecology physician records in California
Ernestine May Wen, 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 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 38% 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 Santa Ana → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Kathy Anderson, M.D.Santa Ana, CA 927051922185966
- Christopher Donnelly, M.D.Santa Ana, CA 927051023217320
- Ambica Garg, M. D.Santa Ana, CA 927051265700975
- Akta Patel, M.D.Santa Ana, CA 927051689873382
- Daniel Reich, MDSanta Ana, CA 927051992794176
- Reza Shafee, M.D.Santa Ana, CA 927051275586992
- Vincent Welter, M.D.Santa Ana, CA 927051366719106
- Somchai Werasophon, M.D.Santa Ana, CA 927051093881849
Common questions
What is Ernestine May Wen, M.D's NPI number?
Ernestine May Wen, M.D's National Provider Identifier (NPI) is 1275738049, issued on Jun 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Ernestine May Wen, M.D located?
The NPPES record lists a practice address at 1900 E 4TH St, Santa Ana, CA, 92705. Phone: (714) 967-4792. Providers update this record themselves, so call before visiting.
How can I verify Ernestine May Wen, M.D's license?
NPPES lists California license number A106114, 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 Ernestine May Wen, M.D prescribe under Medicare Part D?
In 2024, Ernestine May Wen, M.D had 61 Medicare Part D claims for 24 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.