John J. Willems, M.D.
Obstetrics & Gynecology Physician · La Jolla, CA
John J. Willems, M.D. is an obstetrics & gynecology physician with a practice address in La Jolla, California, and NPI 1184664591, issued on Jun 7, 2006. Check the license (California G35952, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John J. Willems
- Credential
- M.D.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G35952 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10666 N Torrey Pines RD, La Jolla, CA 92037
- Phone
- (858) 764-9080
- Enumerated
- Jun 7, 2006
- Record last updated
- Jun 30, 2009 (not updated in 17 years: call before relying on the address or phone)
- Medicaid ID
- 00G359520 CA
- Medicare enrollment
- Enrolled (PECOS I20080617000353); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 1973
- 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 10666 N Torrey Pines RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Terri Abbott, P.A.Physician Assistant1811165566
- Richard Abello, M.D.Diagnostic Radiology Physician1245205996
- Amanda Abrisch, AUDAudiologist1780966903
- Edsel Abud, MD, PHDAllergy & Immunology Physician1891257192
- Christina Adams, MDCardiovascular Disease Physician1023164605
- Dylan Adamson, M.D.Transplant Surgery Physician1598030702
Verify John J. Willems in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G35952Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.1 times the Medicare Part D claims of the average obstetrics & gynecology physician in 2024
507 Medicare Part D claims for 140 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Estradiol185 claims
- Progesterone38 claims
- Clobetasol Propionate31 claims
- Premarin27 claims
- Valacyclovir23 claims
- Clotrimazole-Betamethasone22 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.
Industry payments in 2024: $247.11
3 payments; by number, the most common kind was food and beverage; the largest payer was Astellas Pharma US Inc. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Scripps HealthSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John J. Willems among 5,088 obstetrics & gynecology physician records in California
John J. Willems, 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 fileYes · 53% of these records are
- Graduated1973 · median 2004 among the 2,700 with a school on file
- Record last updated2009 · 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).
68 obstetrics & gynecology physician records list a practice address in La Jolla
They are 68 of the 3,648 NPPES records with a practice address in La Jolla, and 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in La Jolla → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Timothy Bilash, M.D., M.S.La Jolla, CA 920371437189545
- Seth Bulow, M.D.La Jolla, CA 920371174635320
- Chrysten Cunningham, DOLa Jolla, CA 920371265435606
- Pamela Deak, M.D.La Jolla, CA 920371316978554
- Maureen Farrell, M.D.La Jolla, CA 920371508842303
- Robert Gordon, M.D.La Jolla, CA 920371619944030
- Pratima Gupta, MDLa Jolla, CA 920371891749842
- Patrick Haggerty, MDLa Jolla, CA 920371245280841
Common questions
What is John J. Willems, M.D.'s NPI number?
John J. Willems, M.D.'s National Provider Identifier (NPI) is 1184664591, issued on Jun 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John J. Willems, M.D. located?
The NPPES record lists a practice address at 10666 N Torrey Pines RD, La Jolla, CA, 92037. Phone: (858) 764-9080. Providers update this record themselves, so call before visiting.
How can I verify John J. Willems, M.D.'s license?
NPPES lists California license number G35952, 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 John J. Willems, M.D. prescribe under Medicare Part D?
In 2024, John J. Willems, M.D. had 507 Medicare Part D claims for 140 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.