Jeffrey Jay Cowan, M.D.
Obstetrics & Gynecology Physician · Torrance, CA
Jeffrey Jay Cowan, M.D. is an obstetrics & gynecology physician with a practice address in Torrance, California, and NPI 1982618500, issued on Jul 28, 2006. Check the license (California G35295, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jeffrey Jay Cowan
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G35295 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4201 Torrance Blvd Ste 600, Torrance, CA 90503
- Phone
- (310) 540-5503
- Enumerated
- Jul 28, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 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 4201 Torrance Blvd Ste 600
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gail Dewyn, WHNPWomen's Health Nurse Practitioner1386186153
- Revana Lukman, M.D.Obstetrics & Gynecology Physician1104176668
- Megha Patel, D.O.Obstetrics & Gynecology Physician1053842781
- Talia Sojo, LMFTMarriage & Family Therapist1700905379
- Hope Vermaire, D.O.Obstetrics & Gynecology Physician1578827077
- Kelly Williams, M.D.Obstetrics Physician1275795874
Verify Jeffrey Jay Cowan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G35295Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
35 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.
Jeffrey Jay Cowan among 5,088 obstetrics & gynecology physician records in California
Jeffrey Jay Cowan, 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2007 · 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 Torrance → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Stephanie Culver, MDTorrance, CA 905031386758399
- Lisa Fisher, M.D.Torrance, CA 905031285665810
- Martha Hynes, M.D.Torrance, CA 905031801800750
- Denise Ishimaru, M.D.Torrance, CA 905031225219066
- Francine Ito, M.D.Torrance, CA 905031275562993
- John Lim, M.D.Torrance, CA 905031508899493
- David Lu, MDTorrance, CA 905031255515417
- Astrid Mendoza, D.OTorrance, CA 905031871536797
Common questions
What is Jeffrey Jay Cowan, M.D.'s NPI number?
Jeffrey Jay Cowan, M.D.'s National Provider Identifier (NPI) is 1982618500, issued on Jul 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey Jay Cowan, M.D. located?
The NPPES record lists a practice address at 4201 Torrance Blvd Ste 600, Torrance, CA, 90503. Phone: (310) 540-5503. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey Jay Cowan, M.D.'s license?
NPPES lists California license number G35295, 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 Jeffrey Jay Cowan, M.D. prescribe under Medicare Part D?
In 2024, Jeffrey Jay Cowan, M.D. had 35 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.