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​“I want to bring down the barriers of care and totally comprehend who my patients are and where they are coming from.”

Provider Bio down arrow

As an infectious disease specialist, Dr. Mark Ridder, provides care for a diverse range of illnesses and infections. Dr. Ridder sees patients for vascular and skin infections, infections of bone, fungal and bacterial infections, endocarditis, tick-born illnesses and HIV.

Dr. Ridder enjoys educating patients and helping them grasp what they are going through.

“Infectious disease is quite misunderstood," he said. “I like to tell people who are going through things like HIV, you can live a long and healthy life and we will manage this together. Helping inform patients is something I enjoy. I try to identify barriers and help remove them and help manage their problems as a partnership."

Dr. Ridder says he finds the most fulfillment in his line of work when he can totally comprehend where the patient is on their medical journey and to help them get better.

“Patients are sharing what's wrong with them. Generally folks only share their vulnerabilities with their closest friends or maybe their mother," Ridder said. “It is an incredible privilege to walk them through something so personal. I love being able to add something to their lives and help them. I am not the driver, but the voice on the shoulder."

Dr. Ridder attended medical school at the University of South Dakota School of Medicine, Vermillion, South Dakota. He completed his residency in Internal Medicine at Marshfield Clinic Health System and his fellowship at University of Nebraska Medical Center, Omaha, Nebraska.

Dr. Ridder is married with two children and in his spare time, he enjoys playing piano, cross country skiing, downhill skiing, kite flying, sailing, camping and generally getting outdoors.

Professional Summary down arrow

  • Medical School
    University of South Dakota - School of Medicine Vermillion, SD, United States, M.D. 2016

    Residency
    Marshfield Clinic Health System Marshfield, WI, United States, Internal Medicine 2019

    Fellowship
    University of Nebraska Medical Center Omaha, NE, United States, Infectious Disease 2021

  • Professional Societies
    American College of Physicians Infectious Diseases Society of America

    State Licenses
    Wisconsin

    NPI
    1821542739

Patient Ratings down arrow

4.8
out of 5 (85 ratings, 22 comments)
4.9
Provider explanations of my problem
4.9
Provider concern for my questions
4.8
Provider's efforts to include me in treatment decisions
4.8
Provider's discussion of proposed treatment
4.8
My likelihood of recommending this provider

Patient Comments down arrow

Comments are also gathered from the Press Ganey patient satisfaction survey and displayed in their entirety with the exception of any language that may be considered slander, libel or contain private health information, which will be removed prior to publishing.
Comments are from Press Ganey surveys. Slander, libel and private health information are removed.
Sort by:
March 4, 2025
Dr. Ridder showed care & concern and was very helpful. ...
March 6, 2025
Dr. Ridder has always showed great concern regarding my diagnosis. He has been encouraging regarding my treatment and recovery.
March 6, 2025
Dr. Ridder was wonderful.
March 11, 2025
Dr. Ridder was excellent. I would highly recommend him to another. I found him to be very knowledgeable & compassionate!
April 4, 2025
Dr. Ridder care for his patients and listens to what I had to say and explained everything in human terms - easy to understand.
April 6, 2025
Ridder truly amazing!!!
April 8, 2025
Dr Ridder was excellent. I experienced great care and instructions/details too
April 22, 2025
Dr. Ridder is excellent! He really cares about his patients!
May 15, 2025
I have been a patient of the clinic for decades & this was one of the best, personable, know his staff and great teacher. Absolute delight.
July 2, 2025
Dr. Ridder was wonderful, so easy to talk to and so concerned about our problem.
July 9, 2025
Dr. Ridder was very nice, a good listener. I was so pleased.
July 21, 2025
Dr. Ridder is amazing! So personal and caring. He really goes above & beyond to make his pts. feel at ease.
August 4, 2025
Everything was excellent! Dr. Ridder is the best!
October 24, 2025
Excellent, accessible dr. I would refer him to anyone who needs an Infectious Disease expert.
November 26, 2025
Dr. Ridder is AMAZING! I really feel he has my best interest at heart - he listens. He cares -
November 26, 2025
Dr. Ridder is friendly and knowledgeable. He answers questions cheerfully.
December 20, 2025
Dr. Ridder was very nice and explained all the options available.
December 23, 2025
I appreciate everything that Dr. Ridder and his staff has done for me. Forever grateful!
January 5, 2026
Mark Ridder is the best doctor I seen in 20 years.
January 8, 2026
Mark & his nurse were absolutely perfect.
February 17, 2026
Dr. Ridder is an excellent md! He has a great personality, great listener, answers all questions! Excellent care provided!! Always.
April 4, 2025
Was very good answering all of my questions, very patient.
April 4, 2025
Was very good answering all of my questions, very patient.
March 4, 2025
Dr. Ridder showed care & concern and was very helpful. ...
March 6, 2025
Dr. Ridder has always showed great concern regarding my diagnosis. He has been encouraging regarding my treatment and recovery.
March 6, 2025
Dr. Ridder was wonderful.
March 11, 2025
Dr. Ridder was excellent. I would highly recommend him to another. I found him to be very knowledgeable & compassionate!
April 4, 2025
Dr. Ridder care for his patients and listens to what I had to say and explained everything in human terms - easy to understand.
April 6, 2025
Ridder truly amazing!!!
April 8, 2025
Dr Ridder was excellent. I experienced great care and instructions/details too
April 22, 2025
Dr. Ridder is excellent! He really cares about his patients!
May 15, 2025
I have been a patient of the clinic for decades & this was one of the best, personable, know his staff and great teacher. Absolute delight.
July 2, 2025
Dr. Ridder was wonderful, so easy to talk to and so concerned about our problem.
July 9, 2025
Dr. Ridder was very nice, a good listener. I was so pleased.
July 21, 2025
Dr. Ridder is amazing! So personal and caring. He really goes above & beyond to make his pts. feel at ease.
August 4, 2025
Everything was excellent! Dr. Ridder is the best!
October 24, 2025
Excellent, accessible dr. I would refer him to anyone who needs an Infectious Disease expert.
November 26, 2025
Dr. Ridder is AMAZING! I really feel he has my best interest at heart - he listens. He cares -
November 26, 2025
Dr. Ridder is friendly and knowledgeable. He answers questions cheerfully.
December 20, 2025
Dr. Ridder was very nice and explained all the options available.
December 23, 2025
I appreciate everything that Dr. Ridder and his staff has done for me. Forever grateful!
January 5, 2026
Mark Ridder is the best doctor I seen in 20 years.
January 8, 2026
Mark & his nurse were absolutely perfect.
February 17, 2026
Dr. Ridder is an excellent md! He has a great personality, great listener, answers all questions! Excellent care provided!! Always.
March 4, 2025
Dr. Ridder showed care & concern and was very helpful. ...
March 6, 2025
Dr. Ridder has always showed great concern regarding my diagnosis. He has been encouraging regarding my treatment and recovery.
March 6, 2025
Dr. Ridder was wonderful.
March 11, 2025
Dr. Ridder was excellent. I would highly recommend him to another. I found him to be very knowledgeable & compassionate!
April 4, 2025
Was very good answering all of my questions, very patient.
April 4, 2025
Dr. Ridder care for his patients and listens to what I had to say and explained everything in human terms - easy to understand.
April 6, 2025
Ridder truly amazing!!!
April 8, 2025
Dr Ridder was excellent. I experienced great care and instructions/details too
April 22, 2025
Dr. Ridder is excellent! He really cares about his patients!
May 15, 2025
I have been a patient of the clinic for decades & this was one of the best, personable, know his staff and great teacher. Absolute delight.
July 2, 2025
Dr. Ridder was wonderful, so easy to talk to and so concerned about our problem.
July 9, 2025
Dr. Ridder was very nice, a good listener. I was so pleased.
July 21, 2025
Dr. Ridder is amazing! So personal and caring. He really goes above & beyond to make his pts. feel at ease.
August 4, 2025
Everything was excellent! Dr. Ridder is the best!
October 24, 2025
Excellent, accessible dr. I would refer him to anyone who needs an Infectious Disease expert.
November 26, 2025
Dr. Ridder is AMAZING! I really feel he has my best interest at heart - he listens. He cares -
November 26, 2025
Dr. Ridder is friendly and knowledgeable. He answers questions cheerfully.
December 20, 2025
Dr. Ridder was very nice and explained all the options available.
December 23, 2025
I appreciate everything that Dr. Ridder and his staff has done for me. Forever grateful!
January 5, 2026
Mark Ridder is the best doctor I seen in 20 years.
January 8, 2026
Mark & his nurse were absolutely perfect.
February 17, 2026
Dr. Ridder is an excellent md! He has a great personality, great listener, answers all questions! Excellent care provided!! Always.
February 17, 2026
Dr. Ridder is an excellent md! He has a great personality, great listener, answers all questions! Excellent care provided!! Always.
January 8, 2026
Mark & his nurse were absolutely perfect.
January 5, 2026
Mark Ridder is the best doctor I seen in 20 years.
December 23, 2025
I appreciate everything that Dr. Ridder and his staff has done for me. Forever grateful!
December 20, 2025
Dr. Ridder was very nice and explained all the options available.
November 26, 2025
Dr. Ridder is AMAZING! I really feel he has my best interest at heart - he listens. He cares -
November 26, 2025
Dr. Ridder is friendly and knowledgeable. He answers questions cheerfully.
October 24, 2025
Excellent, accessible dr. I would refer him to anyone who needs an Infectious Disease expert.
August 4, 2025
Everything was excellent! Dr. Ridder is the best!
July 21, 2025
Dr. Ridder is amazing! So personal and caring. He really goes above & beyond to make his pts. feel at ease.
July 9, 2025
Dr. Ridder was very nice, a good listener. I was so pleased.
July 2, 2025
Dr. Ridder was wonderful, so easy to talk to and so concerned about our problem.
May 15, 2025
I have been a patient of the clinic for decades & this was one of the best, personable, know his staff and great teacher. Absolute delight.
April 22, 2025
Dr. Ridder is excellent! He really cares about his patients!
April 8, 2025
Dr Ridder was excellent. I experienced great care and instructions/details too
April 6, 2025
Ridder truly amazing!!!
April 4, 2025
Was very good answering all of my questions, very patient.
April 4, 2025
Dr. Ridder care for his patients and listens to what I had to say and explained everything in human terms - easy to understand.
March 11, 2025
Dr. Ridder was excellent. I would highly recommend him to another. I found him to be very knowledgeable & compassionate!
March 6, 2025
Dr. Ridder has always showed great concern regarding my diagnosis. He has been encouraging regarding my treatment and recovery.
March 6, 2025
Dr. Ridder was wonderful.
March 4, 2025
Dr. Ridder showed care & concern and was very helpful. ...

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