Jon F. Willen, M.D.
Infectious Disease Physician · West Hills, CA
Jon F. Willen, M.D. is an infectious disease physician with a practice address in West Hills, California, and NPI 1124117593, issued on Oct 12, 2006. Check the license (California C37027, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jon F. Willen
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- C37027 CA
Self-reported in NPPES; status is on the state search - Practice location
- 7230 Medical Center Dr, West Hills, CA 91307
- Phone
- (818) 226-6811
- Enumerated
- Oct 12, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (818) 226-6810
- Medicaid ID
- 00C370231 CA
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 7230 Medical Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amy Alkire, M.D.Neurological Surgery Physician1952450462
- Alen Arakelian, DCChiropractor1770641623
- Wendy Asarch, RNNPWomen's Health Nurse Practitioner1578738985
- Bineeta BattuRegistered Dietitian1134503634
- Bonnie Beaver, M.D.Obstetrics & Gynecology Physician1235153974
- Jason Bromberg, M.D.Pediatrics Physician1528082609
Verify Jon F. Willen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C37027Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average infectious disease physician in 2024
22 Medicare Part D claims, against an average of 689 among the 7,388 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.
Jon F. Willen among 1,119 infectious disease physician records in California
Jon F. Willen, M.D. is one of 1,119 infectious disease physician records with a practice address in California. 79% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 54% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2007 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in West Hills → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Jacqueline Adler, M.D.West Hills, CA 913071326094582
- Mariam Bakhtary, MDWest Hills, CA 913071134492895
- Manju Haridas, M.D.Bell Canyon, CA 913071083805469
- John Li, M.D.West Hills, CA 913071487678041
- Wendy Clough, M.D.Newhall, CA 913211225077175
- Ellsworth Pryor, M.DNewhall, CA 913211952344988
- Edwin Yellin, MDNorthridge, CA 913241467670307
- Belen Matias, M.D.Northridge, CA 913251881874691
Common questions
What is Jon F. Willen, M.D.'s NPI number?
Jon F. Willen, M.D.'s National Provider Identifier (NPI) is 1124117593, issued on Oct 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jon F. Willen, M.D. located?
The NPPES record lists a practice address at 7230 Medical Center Dr, West Hills, CA, 91307. Phone: (818) 226-6811. Providers update this record themselves, so call before visiting.
How can I verify Jon F. Willen, M.D.'s license?
NPPES lists California license number C37027, 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 Jon F. Willen, M.D. prescribe under Medicare Part D?
In 2024, Jon F. Willen, M.D. had 22 Medicare Part D claims; the average among infectious disease physician prescribers was 689. 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.