Dr. Ronald Willenborg, MD


Internal Medicine | Male

Ronald K Willenborg MD 543 Valley Rd Ste 4 Upper Montclair, NJ 07043 Get Directions
Dr. Ronald Willenborg, MD

Dr. Ronald Willenborg, MD is an internal medicine doctor who practices in Upper Montclair, NJ. He is 66 years old and has been practicing for 40 years. Dr. Willenborg is affiliated with Hackensackumc Mountainside.

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Dr. Willenborg's Experience

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Languages Spoken

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Memberships & Professional Affiliations

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Visiting Dr. Willenborg

Dr. Willenborg accepts 12 insurance carriers

Affiliated Hospitals

Hospital Quality
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Dr. Willenborg's Reviews

Likelihood of recommending Dr. Willenborg to family and friends
based on 16 total reviews (3 with comments)
Dr. Willenborg's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    Under 10 minutes
Patient Comments (3)
in Montclair, NJ |
Dr Willenborg is attentive, personable, sharp, and does everything himself, including taking blood and weighing me. No matter how sick I have felt, he always manages to make me laugh.
in Warren |
Dr. Willenborg is a rare doctor who spends time with his patients to understand their overall health and well being. He is caring and offers a comprehensive approach. I am only saddened that he is not taking new patients so I cannot refer my children who are leaving the pediatric phase. Dr. Willenborg is the best physician I have ever met.
in Cedar Grove, NJ |
Dr Willenborg is so smart and informed about modern medicine. Meticulous and extremely serious about keeping his patients healthy. An unbelievably intuitive and spectacular ability to diagnose.
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Dr. Willenborg's experience matches your search based on the following criteria:

  •  Based on total number of patients treated over the last 12 months
  •  Specializes in Internal Medicine
  •  Board certified in Internal Medicine
  •  No malpractice claims found
  •  No sanctions found
  •  No board actions found

Awards & Recognition

  • Awards & Honors
    • Healthgrades Honor Roll
    What is a recognized doctor
  • Media & Publications

    Dr. Willenborg has no media or publications listed.

Background Check

  • 0
    Malpractice Claims

    No malpractice history found for New Jersey.

    What is medical malpractice
  • 0

    No sanctions history found for the years that Healthgrades collects data.

    What is a sanction or disciplinary action
  • 0
    Board Actions

    No board actions found for the years that Healthgrades collects data.

    What are board actions

Board Certifications

Why It Matters: Dr. Willenborg's Board Certifications

Board certification should be one of your top considerations when choosing a doctor. Board certification is an official recognition given to doctors who have met specific requirements set by national medical specialty boards in the... More

  • Internal Medicine

Conditions Treated

Dr. Willenborg does not have any conditions listed. If you are Dr. Willenborg and would like to add conditions you treat, please update your free profile.


  • Medical School
    Umdnj--New Jersey Medical School

    Graduated in 1977

  • Internship Hospital
    Umdnj-University Hospital

    Completed in 1978

  • Residency Hospital
    Umdnj-University Hospital

    Completed in 1980

  • Fellowship Hospital
    Umdnj-University Hospital

    Completed in 1981

Languages Spoken

  • English

Memberships &
Professional Affiliations

Dr. Willenborg does not have any memberships or affiliations listed. If you are Dr. Willenborg and would like to add memberships or affiliations, please update your free profile.


  • Internal Medicine

Procedures Performed

Dr. Willenborg does not have any procedures listed. If you are Dr. Willenborg and would like to add procedures you perform, please update your free profile.