Katharine Bourdet Simmons, M.D.
Obstetrics & Gynecology Physician · San Leandro, CA
Katharine Bourdet Simmons, M.D. is an obstetrics & gynecology physician with a practice address in San Leandro, California, and NPI 1508008624, issued on Apr 3, 2009. Check the license (California A148588, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katharine Bourdet Simmons
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A148588 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2500 Merced St FL 4, San Leandro, CA 94577
- Phone
- (510) 454-4090
- Enumerated
- Apr 3, 2009
- Record last updated
- Jul 21, 2022
- Medicare enrollment
- Enrolled (PECOS I20171004003758); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 2009
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 2500 Merced St FL 4
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Faye Yu, M.D.Surgery Physician1508251372
Verify Katharine Bourdet Simmons in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A148588Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
96 Medicare Part D claims for 58 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Most prescribed
- Estradiol21 claims
- Betamethasone Diprop Augmented13 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
- Permanente Medical Group IncSan Leandro, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katharine Bourdet Simmons among 5,088 obstetrics & gynecology physician records in California
Katharine Bourdet Simmons, 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 fileYes · 53% of these records are
- Graduated2009 · median 2004 among the 2,700 with a school on file
- Record last updated2022 · 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 Leandro → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Linda Catherine Degusta, M.D.San Leandro, CA 945771578635397
- Simone Katz, M.D.San Leandro, CA 945771770661522
- Colleen Kavanagh, M.D.San Leandro, CA 945771174608830
- Marie La Cour, M.D.San Leandro, CA 945771144372947
- Jolyn Leung, M.D.San Leandro, CA 945771629372180
- Sarah Mark-Drasin, M.D.San Leandro, CA 945771700957610
- John Polito, M.D.San Leandro, CA 945771952489965
- Robert Rubeshaw, M.D.San Leandro, CA 945771629156484
Common questions
What is Katharine Bourdet Simmons, M.D.'s NPI number?
Katharine Bourdet Simmons, M.D.'s National Provider Identifier (NPI) is 1508008624, issued on Apr 3, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Katharine Bourdet Simmons, M.D. located?
The NPPES record lists a practice address at 2500 Merced St FL 4, San Leandro, CA, 94577. Phone: (510) 454-4090. Providers update this record themselves, so call before visiting.
How can I verify Katharine Bourdet Simmons, M.D.'s license?
NPPES lists California license number A148588, 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 Katharine Bourdet Simmons, M.D. prescribe under Medicare Part D?
In 2024, Katharine Bourdet Simmons, M.D. had 96 Medicare Part D claims for 58 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.