Onouwem Nseyo
Obstetrics & Gynecology Physician · San Francisco, CA
Onouwem Nseyo is an obstetrics & gynecology physician with a practice address in San Francisco, California, and NPI 1619395027, issued on Apr 2, 2014. Check the license (California A139565, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Onouwem Nseyo
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A139565 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1001 Potrero Ave # 6D, San Francisco, CA 94110
- Phone
- (415) 206-4069
- Enumerated
- Apr 2, 2014
- Record last updated
- Aug 21, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20180920002392); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2014
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1001 Potrero Ave # 6D
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Chitra Akileswaran, MDObstetrics & Gynecology Physician1053600734
- Michele Baron, MDObstetrics & Gynecology Physician1932594264
- Adam Bonnington, MDObstetrics & Gynecology Physician1811382328
- Katherine BritoStudent in an Organized Health Care Education/Training Program1104567171
- Arianna Cassidy, MDObstetrics & Gynecology Physician1902268923
- Andrea Dalve-Endres, MDObstetrics & Gynecology Physician1326225905
Verify Onouwem Nseyo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A139565Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
107 Medicare Part D claims for 46 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims.
Most prescribed
- Estradiol24 claims
- Estradiol (Twice Weekly)17 claims
- Progesterone11 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
- Sutter Bay Medical FoundationBerkeley, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Onouwem Nseyo among 5,088 obstetrics & gynecology physician records in California
Onouwem Nseyo 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 2014, is newer than 80% of them.
- NPI issued2014 · 80% of these records are older, 17% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2014 · median 2004 among the 2,700 with a school on file
- Record last updated2018 · 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 Francisco → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Yamilee Bermingham, M.D.San Francisco, CA 941101013937127
- Deborah Cohan, MDSan Francisco, CA 941101831143221
- Craig Cohen, MDSan Francisco, CA 941101306889613
- Teresa Depineres, MDSan Francisco, CA 941101205880796
- Eleanor Drey, MDSan Francisco, CA 941101942254438
- Rebecca Jackson, MDSan Francisco, CA 941101699729640
- Vanessa Jacoby, MDSan Francisco, CA 941101154363778
- Barbara Nicol, M.D.San Francisco, CA 941101710907811
Common questions
What is Onouwem Nseyo's NPI number?
Onouwem Nseyo's National Provider Identifier (NPI) is 1619395027, issued on Apr 2, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Onouwem Nseyo located?
The NPPES record lists a practice address at 1001 Potrero Ave # 6D, San Francisco, CA, 94110. Phone: (415) 206-4069. Providers update this record themselves, so call before visiting.
How can I verify Onouwem Nseyo's license?
NPPES lists California license number A139565, 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 Onouwem Nseyo prescribe under Medicare Part D?
In 2024, Onouwem Nseyo had 107 Medicare Part D claims for 46 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.