Kathryn Marie Osei-Bonsu
Obstetrics & Gynecology Physician · Santa Rosa, CA
Kathryn Marie Osei-Bonsu is an obstetrics & gynecology physician with a practice address in Santa Rosa, California, and NPI 1174159164, issued on Mar 21, 2020. Check the license (California A189973, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kathryn Marie Osei-Bonsu
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- A189973 CA
Self-reported in NPPES; status is on the state search - Practice location
- 34 Mark West Springs RD, Santa Rosa, CA 95403
- Phone
- (707) 541-7900
- Enumerated
- Mar 21, 2020
- Record last updated
- Dec 4, 2024
- Fax
- (707) 573-5413
- Medicare enrollment
- Enrolled (PECOS I20250211000363); accepts Medicare assignment
- Medical or professional school
- Virginia Commonwealth University, School Of Medicine, 2020
- 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 34 Mark West Springs RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Stephanie Huang, M.D.Otolaryngology Physician1699963231
- Augustina Jancic, FNPFamily Nurse Practitioner1760205017
Verify Kathryn Marie Osei-Bonsu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A189973Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
16 Medicare Part D claims, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
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 FoundationSanta Rosa, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kathryn Marie Osei-Bonsu among 5,088 obstetrics & gynecology physician records in California
Kathryn Marie Osei-Bonsu 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 2020, is newer than 94% of them.
- NPI issued2020 · 94% of these records are older, 4% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2020 · median 2004 among the 2,700 with a school on file
- Record last updated2024 · 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 Rosa → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- David Bennett, MDSanta Rosa, CA 954031770667743
- Lauren Bower, MDSanta Rosa, CA 954031588748586
- Jean Cool, MDSanta Rosa, CA 954031992889968
- Susan Dehnad, MDSanta Rosa, CA 954031922294834
- Brad Golditch, MDSanta Rosa, CA 954031962586966
- Madeline Huber, MDSanta Rosa, CA 954031467536458
- Richard Klekman, MDSanta Rosa, CA 954031497839468
- Richard Lederman, MDSanta Rosa, CA 954031679657746
Common questions
What is Kathryn Marie Osei-Bonsu's NPI number?
Kathryn Marie Osei-Bonsu's National Provider Identifier (NPI) is 1174159164, issued on Mar 21, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn Marie Osei-Bonsu located?
The NPPES record lists a practice address at 34 Mark West Springs RD, Santa Rosa, CA, 95403. Phone: (707) 541-7900. Providers update this record themselves, so call before visiting.
How can I verify Kathryn Marie Osei-Bonsu's license?
NPPES lists California license number A189973, 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 Kathryn Marie Osei-Bonsu prescribe under Medicare Part D?
In 2024, Kathryn Marie Osei-Bonsu had 16 Medicare Part D claims; 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.