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“I’m just an internist who loves helping patients and takes the best care of them that I can.”

Wausau Center

2727 Plaza Drive
Wausau, WI 54401

Appointment Phone:
1-715-847-3251

Provider Bio down arrow

“I wanted to be a doctor ever since the 9th grade,” says Dr. Schaller. “I took a day tour of a medical school, and the internist was the smartest doctor in the room – he always looked at a complete picture of the patient, and he could talk with any specialist and speak their language. That’s what I do.”

“A lot of my work involves managing diabetes, high cholesterol and other things associated with the natural aging process,” he explains. “Sometimes they happen at the same time, so having a physician who can coordinate care – knowing your preferences, tendencies, past history and family history – improves your care.”

Dr. Schaller and his wife, Blythe, a former social worker, live on an 11-acre property just west of Wausau. He stays active running, swimming, cycling and skiing. He’s skied the Birkebeiner and has competed in the Wausau Triathlon every year for over 20 years.

Dr. Schaller completed medical school at the University of Wisconsin School of Medicine and Public Health, in Madison. He completed an internship and a residency, both in internal medicine, at Maricopa Integrated Health System – Maricopa Medical Center, in Phoenix, Arizona. He is board-certified in internal medicine.

Professional Summary down arrow

  • Medical School
    University of Wisconsin School of Medicine & Public Health Madison, WI, United States, M.D. 1980

    Internship
    Maricopa Intregrated Health System - Marciopa Medical Center Phoenix, AZ, United States, Internal Medicine 1981

    Residency
    Maricopa Intregrated Health System - Marciopa Medical Center Phoenix, AZ, United States, Internal Medicine 1983

  • Professional Societies
    Wisconsin Medical Society

    Board Certifications
    Internal Medicine: 1983

    State Licenses
    Illinois Wisconsin

    Make a patient referral

Patient Ratings down arrow

4.9
out of 5 (157 ratings, 22 comments)
4.9
Provider friendliness
4.9
Provider explanations of my problem
4.8
Provider concern for my questions
4.8
Provider's efforts to include me in treatment decisions
4.8
Provider's medication information
4.8
Provider's follow-up care instructions
4.9
Provider's use of words I understood
4.9
Provider's amount of time with me
4.9
My confidence in this provider
4.9
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.
Sort by:
June 30, 2017
Dr. Schaller is the best doctor I ever had.
July 21, 2017
Excellent & very good.
September 02, 2017
excellent knowledge about all my problems. great listener and very kind
September 06, 2017
I've always been pleased with the care given by Dr. Schaller, he's a fine doctor.
September 09, 2017
Your doctors are EXCELLENT. Especially Dr. Schaller.
September 27, 2017
as always Dr. Schaller always goes that extra mile to ensure my health and is well.
October 12, 2017
Ivan Schaller is the BEST!
November 03, 2017
Excellent doctor, excellent experience.
November 04, 2017
Dr. Schaller ALWAYS takes that extra time to understand my concerns, he listens to me and that is so important. If things are needed to be done ASAP he gets them done and tells me the outcome.
November 25, 2017
Dr. Schaller has always done an excellent job of making sure all of my questions/concerns are addressed in a manner that I understand. He is very conscientious. I have absolute confidence in him, as the Captain of My Ship medically.
December 06, 2017
Dr. Schaller has been my dr. for 25 plus years.
December 09, 2017
Best doctor I have had the pleasure of meeting in a long time. Very nice and personable. Very good doctor!
December 25, 2017
dr schaller is very kind and thorough. very considerate of my problems!
December 30, 2017
Dr. Schaller is a great physician - Kind & caring!
December 30, 2017
Dr. I. Schaller is the BEST physician I've ever seen in my 63 years.
January 11, 2018
Excellent.
January 22, 2018
Excellent.
February 05, 2018
The changes we are making were the result of open communication which I very much appreciate with Dr. Ivan Schaller.
February 05, 2018
Dr. Schaller is an excellent internist - he is available by phone & email & answers are given in a very good turn-around time.
February 19, 2018
excellent Doctor, Highly recommend
February 28, 2018
Dr. Schaller has been my physician for years and is always there for me & most important listens to my suggestions & welcomes my impute -
June 05, 2017
Wanted to discuss Xanax a little more - letter sent to dr.
June 05, 2017
Wanted to discuss Xanax a little more - letter sent to dr.
June 30, 2017
Dr. Schaller is the best doctor I ever had.
July 21, 2017
Excellent & very good.
September 02, 2017
excellent knowledge about all my problems. great listener and very kind
September 06, 2017
I've always been pleased with the care given by Dr. Schaller, he's a fine doctor.
September 09, 2017
Your doctors are EXCELLENT. Especially Dr. Schaller.
September 27, 2017
as always Dr. Schaller always goes that extra mile to ensure my health and is well.
October 12, 2017
Ivan Schaller is the BEST!
November 03, 2017
Excellent doctor, excellent experience.
November 04, 2017
Dr. Schaller ALWAYS takes that extra time to understand my concerns, he listens to me and that is so important. If things are needed to be done ASAP he gets them done and tells me the outcome.
November 25, 2017
Dr. Schaller has always done an excellent job of making sure all of my questions/concerns are addressed in a manner that I understand. He is very conscientious. I have absolute confidence in him, as the Captain of My Ship medically.
December 06, 2017
Dr. Schaller has been my dr. for 25 plus years.
December 09, 2017
Best doctor I have had the pleasure of meeting in a long time. Very nice and personable. Very good doctor!
December 25, 2017
dr schaller is very kind and thorough. very considerate of my problems!
December 30, 2017
Dr. Schaller is a great physician - Kind & caring!
December 30, 2017
Dr. I. Schaller is the BEST physician I've ever seen in my 63 years.
January 11, 2018
Excellent.
January 22, 2018
Excellent.
February 05, 2018
The changes we are making were the result of open communication which I very much appreciate with Dr. Ivan Schaller.
February 05, 2018
Dr. Schaller is an excellent internist - he is available by phone & email & answers are given in a very good turn-around time.
February 19, 2018
excellent Doctor, Highly recommend
February 28, 2018
Dr. Schaller has been my physician for years and is always there for me & most important listens to my suggestions & welcomes my impute -
June 05, 2017
Wanted to discuss Xanax a little more - letter sent to dr.
June 30, 2017
Dr. Schaller is the best doctor I ever had.
July 21, 2017
Excellent & very good.
September 02, 2017
excellent knowledge about all my problems. great listener and very kind
September 06, 2017
I've always been pleased with the care given by Dr. Schaller, he's a fine doctor.
September 09, 2017
Your doctors are EXCELLENT. Especially Dr. Schaller.
September 27, 2017
as always Dr. Schaller always goes that extra mile to ensure my health and is well.
October 12, 2017
Ivan Schaller is the BEST!
November 03, 2017
Excellent doctor, excellent experience.
November 04, 2017
Dr. Schaller ALWAYS takes that extra time to understand my concerns, he listens to me and that is so important. If things are needed to be done ASAP he gets them done and tells me the outcome.
November 25, 2017
Dr. Schaller has always done an excellent job of making sure all of my questions/concerns are addressed in a manner that I understand. He is very conscientious. I have absolute confidence in him, as the Captain of My Ship medically.
December 06, 2017
Dr. Schaller has been my dr. for 25 plus years.
December 09, 2017
Best doctor I have had the pleasure of meeting in a long time. Very nice and personable. Very good doctor!
December 25, 2017
dr schaller is very kind and thorough. very considerate of my problems!
December 30, 2017
Dr. Schaller is a great physician - Kind & caring!
December 30, 2017
Dr. I. Schaller is the BEST physician I've ever seen in my 63 years.
January 11, 2018
Excellent.
January 22, 2018
Excellent.
February 05, 2018
The changes we are making were the result of open communication which I very much appreciate with Dr. Ivan Schaller.
February 05, 2018
Dr. Schaller is an excellent internist - he is available by phone & email & answers are given in a very good turn-around time.
February 19, 2018
excellent Doctor, Highly recommend
February 28, 2018
Dr. Schaller has been my physician for years and is always there for me & most important listens to my suggestions & welcomes my impute -
February 28, 2018
Dr. Schaller has been my physician for years and is always there for me & most important listens to my suggestions & welcomes my impute -
February 19, 2018
excellent Doctor, Highly recommend
February 05, 2018
The changes we are making were the result of open communication which I very much appreciate with Dr. Ivan Schaller.
February 05, 2018
Dr. Schaller is an excellent internist - he is available by phone & email & answers are given in a very good turn-around time.
January 22, 2018
Excellent.
January 11, 2018
Excellent.
December 30, 2017
Dr. Schaller is a great physician - Kind & caring!
December 30, 2017
Dr. I. Schaller is the BEST physician I've ever seen in my 63 years.
December 25, 2017
dr schaller is very kind and thorough. very considerate of my problems!
December 09, 2017
Best doctor I have had the pleasure of meeting in a long time. Very nice and personable. Very good doctor!
December 06, 2017
Dr. Schaller has been my dr. for 25 plus years.
November 25, 2017
Dr. Schaller has always done an excellent job of making sure all of my questions/concerns are addressed in a manner that I understand. He is very conscientious. I have absolute confidence in him, as the Captain of My Ship medically.
November 04, 2017
Dr. Schaller ALWAYS takes that extra time to understand my concerns, he listens to me and that is so important. If things are needed to be done ASAP he gets them done and tells me the outcome.
November 03, 2017
Excellent doctor, excellent experience.
October 12, 2017
Ivan Schaller is the BEST!
September 27, 2017
as always Dr. Schaller always goes that extra mile to ensure my health and is well.
September 09, 2017
Your doctors are EXCELLENT. Especially Dr. Schaller.
September 06, 2017
I've always been pleased with the care given by Dr. Schaller, he's a fine doctor.
September 02, 2017
excellent knowledge about all my problems. great listener and very kind
July 21, 2017
Excellent & very good.
June 30, 2017
Dr. Schaller is the best doctor I ever had.
June 05, 2017
Wanted to discuss Xanax a little more - letter sent to dr.