Mary Catherine Washburn, M.D.
Obstetrics & Gynecology Physician · Garden Grove, CA
Mary Catherine Washburn, M.D. is an obstetrics & gynecology physician with a practice address in Garden Grove, California, and NPI 1225203169, issued on Apr 22, 2008. Check the license (California A113839, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mary Catherine Washburn
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- A113839 CA
37528 AZ
155911 NC
Self-reported in NPPES; status is on the state search - Practice location
- 12100 Euclid St, Garden Grove, CA 92840
- Phone
- (714) 887-9933
- Enumerated
- Apr 22, 2008
- Record last updated
- Dec 14, 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 12100 Euclid St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maydole Aldalur, NURSE PRACTITIONERPediatric Nurse Practitioner1811317001
- Christine AtallaPharmacist1154860070
- Yvonne Bach, M.D.Pediatrics Physician1396967337
- Ashley Brown, M.D.Dermatology Physician1245591783
- Tuan Cao, PHARM.DPharmacist1679011571
- Jennifer Chan, D.O.Family Medicine Physician1821433830
Verify Mary Catherine Washburn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A113839Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
39 Medicare Part D claims for 22 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol20 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.
Mary Catherine Washburn among 5,088 obstetrics & gynecology physician records in California
Mary Catherine Washburn, 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 2008, is newer than 62% of them.
- NPI issued2008 · 62% of these records are older, 34% 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 Garden Grove → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Tuong Van Nguyen, M.D.Garden Grove, CA 928401851719132
- Mehrdad Forghani-Arani, D.O.Garden Grove, CA 928431457373342
- Ha Nguyen, M.D.Garden Grove, CA 928431447275631
- Thanh-Mai Trinh, MDGarden Grove, CA 928431578589560
- Christopher Winkle, MDGarden Grove, CA 928431437221561
- Thuc Tran, M.D.Garden Grove, CA 928441669580064
- Christina Borsari, MDFullerton, CA 928351356308704
- Christina BuchananFullerton, CA 928351750818357
Common questions
What is Mary Catherine Washburn, M.D.'s NPI number?
Mary Catherine Washburn, M.D.'s National Provider Identifier (NPI) is 1225203169, issued on Apr 22, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mary Catherine Washburn, M.D. located?
The NPPES record lists a practice address at 12100 Euclid St, Garden Grove, CA, 92840. Phone: (714) 887-9933. Providers update this record themselves, so call before visiting.
How can I verify Mary Catherine Washburn, M.D.'s license?
NPPES lists California license number A113839, 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 Mary Catherine Washburn, M.D. prescribe under Medicare Part D?
In 2024, Mary Catherine Washburn, M.D. had 39 Medicare Part D claims for 22 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.