Browse Health
Internist, Infectious Disease Specialist (virus, bacteria, parasites)
39 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 (2)

The overall average patient rating of Dr. Jon Willen is Average. Dr. Willen has been reviewed by 3 patients who have provided 2 comments. The rating is 2.5 out of 5 stars.

Patient Ratings
Ease of Appointment 2.3
Promptness 3.7
Courteous Staff 3.7
Accurate Diagnosis 2.3
Bedside Manner 1.0
Spends Time with Me 1.0
Follows Up After Visit 1.0

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

Similar doctors nearby

Dr. Lawrence Guziel

Internal Medicine
49 years experience
West Hills, CA

Dr. Phillip Harber

Internal Medicine
40 years experience
West Hills, CA

Dr. Leon Schoenfeld

Internal Medicine
West Hills, CA

Dr. Mariam Bakhtary

Internal Medicine
West Hills, CA

Dr. John Li

Internal Medicine
12 years experience
West Hills, CA

Dr. Samuel Wilson

Internal Medicine
38 years experience
West Hills, CA
Search All Similar Doctors
Additional Information
Dr. Jon F Willen MD is a male Internist, has 39 years of experience and practices in Internal Medicine and Infectious Disease.
Where does Dr. Jon F. Willen practice?
Dr. Jon Willen has 1 office location.
Dr. Jon Willen practices Internal Medicine and Infectious Disease near West Hills, CA.
See West Hills Internists and West Hills Infectious Disease Doctors.