Diemchi Nguyenphuc, MD
Obstetrics & Gynecology Physician · Santa Ana, CA
Diemchi Nguyenphuc, MD is an obstetrics & gynecology physician with a practice address in Santa Ana, California, and NPI 1629104930, issued on Feb 23, 2007. Check the license (California G68620, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Diemchi Nguyenphuc
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G68620 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3501 S Harbor Blvd, Santa Ana, CA 92704
- Phone
- (714) 929-2300
- Enumerated
- Feb 23, 2007
- Record last updated
- Jan 24, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicaid ID
- 00G686200 CA
- Medicare enrollment
- Enrolled (PECOS I20120327000955); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1990
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 3501 S Harbor Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ronnie Alas, M.D.Internal Medicine Physician1306267026
- Joel Arter, MDFamily Medicine Physician1942512744
- Eileen May Barraza, N.P.Nurse Practitioner1487105243
- Rama Bathala-Patel, MDFamily Medicine Physician1992853774
- Charles Egesdal, M.D.Pediatrics Physician1861925471
- Emad Hashemi, M.D.Obstetrics & Gynecology Physician1568492759
Verify Diemchi Nguyenphuc in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G68620Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
48 Medicare Part D claims for 18 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol19 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.
Bills Medicare through one group practice
- Community Medical Wellness Centers USALong Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Diemchi Nguyenphuc among 5,088 obstetrics & gynecology physician records in California
Diemchi Nguyenphuc, MD 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 fileYes · 53% of these records are
- Graduated1990 · median 2004 among the 2,700 with a school on file
- Record last updated2017 · 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
- Emad Hashemi, M.D.Santa Ana, CA 927041568492759
- Hubert Jeng, M.DSanta Ana, CA 927041134182850
- George Kallins, M.D.Santa Ana, CA 927041578756581
- Jenny Lee, M.D.Santa Ana, CA 927041801057278
- Jaime Ludmir, M.DSanta Ana, CA 927041265539712
- Van Nguyen, DOSanta Ana, CA 927041205845237
- Sing Tung, MDSanta Ana, CA 927041619913720
- Janel Yoshida, MDSanta Ana, CA 927041538112826
Common questions
What is Diemchi Nguyenphuc, MD's NPI number?
Diemchi Nguyenphuc, MD's National Provider Identifier (NPI) is 1629104930, issued on Feb 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Diemchi Nguyenphuc, MD located?
The NPPES record lists a practice address at 3501 S Harbor Blvd, Santa Ana, CA, 92704. Phone: (714) 929-2300. Providers update this record themselves, so call before visiting.
How can I verify Diemchi Nguyenphuc, MD's license?
NPPES lists California license number G68620, 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 Diemchi Nguyenphuc, MD prescribe under Medicare Part D?
In 2024, Diemchi Nguyenphuc, MD had 48 Medicare Part D claims for 18 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.