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Internist, Infectious Disease Specialist (virus, bacteria, parasites)
38 years of experience
Accepting new patients
License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. Jon Willen is Average. Dr. Willen has been reviewed by 4 patients who have provided 3 comments. The rating is 3 out of 5 stars.

Patient Ratings
Ease of Appointment 3.7
Promptness 4.3
Courteous Staff 4.3
Accurate Diagnosis 3.7
Bedside Manner 3.0
Spends Time with Me 3.0
Follows Up After Visit 3.0

Specialties & Research

Dr. Jon Willen, MD is board certified in Internal Medicine and Infectious Disease.

  • He has special expertise in 3 areas:
  • AIDS/HIV (Acquired Immunodeficiency Syndrome)
  • HIV Infections
  • Hepatitis C

Education & Awards

Dr. Willen graduated from Wake Forest University, Winston Salem.


Dr. Willen has 8 hospital affiliations:

  • Northridge Hospital Medical Center, Roscoe Boulevard Campus 
  • West Hills Hospital & Medical Center 


  • Spanish
  • English

> > > > Dr. Jon Willen, MD

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Additional Information
Dr. Jon F Willen MD is a male Internist, has 38 years of experience and practices in Internal Medicine and Infectious Disease.
Where does Dr. Jon F. Willen practice?
Dr. Jon Willen has 2 office locations.
Dr. Jon Willen practices Internal Medicine and Infectious Disease near West Hills, CA.
Additional practice locations include: Agoura Hills, CA.
See West Hills Internists and West Hills Infectious Disease Doctors.