background
background
Dr. Karl Undesser, MD

Dr. Karl Undesser, MD

Cardiology*
35+ years of experience

Dr. Karl Undesser, MD is a cardiologist in Caldwell, ID and has over 35 years of experience in the medical field. Dr. Undesser has extensive experience in Adult Congenital Heart Conditions and Heart Conditions. He graduated from University of Texas - San Antonio HSC in 1989. He is affiliated with West Valley Medical Center. He is accepting new patients and telehealth appointments.

4.7 Star Rating
Based on 72 reviews 4.7 Star Rating (72 reviews)

Locations

West Valley Cardiology Services

West Valley Cardiology Services1906 Fairview Ave Ste 230 Caldwell, ID 83605
1

West Valley Cardiology Services - Weiser

West Valley Cardiology Services - Weiser645 E 5th St Weiser, ID 83672
2

West Valley Medical Group - Meridian Clinic

West Valley Medical Group - Meridian Clinic745 S Progress Ave Ste 120 Meridian, ID 83642
3

Hospital Highlight

Dr. Undesser is affiliated with West Valley Medical Center Caldwell, a highly rated hospital.

Dr. Undesser is a Healthgrades Choice provider in Cardiology

The Healthgrades Choice designation helps you understand the most important factors to consider when choosing a healthcare professional. This designation is earned based on four set standards.
Read our methodology

  • Above average experience
  • Good hospital quality
  • Good patient ratings
  • No healthcare sanctions
  • Areas of ExpertiseDr. Undesser specializes in the areas of Cardiovascular Disease & Clinical Cardiac Electrophysiology. See board certifications
  • Explains Conditions WellPatients said this doctor explains conditions well. See reviews
  • Offers TelehealthThis doctor offers telehealth appointments. Call the office to schedule an appointment.
  • Practices at Top HospitalPatient Safety Excellence Award™ See hospitals

More Cardiology Specialists at West Valley Medical Center

Experience Check

Search for experience in a specific area

Dr. Undesser's Reviews

Likelihood to recommend Dr. Undesser

4.7
72 ratings, 57 with a written review
5 star
90%
90%
4 star
1%
1%
3 star
1%
1%
2 star
1%
1%
1 star
6%
6%

Your trust is our top concern.

We strive to keep reviews honest, trustworthy, and fair.

Doctors can not pay for good reviews, nor can they pay to have negative reviews removed.

We monitor all reviews to ensure they comply with our guidelines and don’t include personal information, profanity, libel, defamation, harassment, obscenity or fraud.

Any reviews that are deemed fraudulent or violate our guidelines will be removed immediately.

All reviews are confirmed and audited before publication, and community members have the ability to flag inappropriate content for further review by our team.

Retired in Place
I first went to Dr Undesser in 2002. He was the best in the valley and took care of my issue. I didn't need to see him again for about 10 years. When I returned for more care, his visits were so brief that he seemed uninterested. My parents have been his patients since the 90's. I make sure they get their medications and take them to their visits. Dr is very brief with them also. At dad's last visit, Dr refused to answer my question on what one of dad's medications was for. Three times I asked and three times he would only say heart patients lived longer taking the medication. He was very condescending. I changed doctors last year and will find a new doctor for my parents.
What went well
  • Staff friendliness
What could be improved
  • I didn't feel respected
  • Didn't listen or answer questions
  • Didn't explain conditions well
  • Appointment was rushed
5 others found this helpful
Helpful
Diane – Aug 23, 2023
We are sorry to hear of this experience with Dr.... Read More
×Post a ResponseAre you Dr. Undesser?
Do not see him
Terrible. First meeting was rushed and treated like an idiot. After 3 failed cardioversions I was put on two medications. They made me dizzy, short of breath and a list of side effects. After two follow ups I was told "your vitals look good" and "it is part of the game" I am seeing someone else.
What went well
No results
What could be improved
  • I didn't feel respected
  • Didn't trust the provider's decisions
5 others found this helpful
Helpful
Concerned patient – Jun 28, 2023
×Post a ResponseAre you Dr. Undesser?
I became a patient in May 2021. Very through doctor. His personality is Warm and cares about his patient. You leave Satisfied about your health ??
What went well
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
4 others found this helpful
Helpful
Mary Pat – Jul 11, 2021
Thank you for taking the time to leave your... Read More
×Post a ResponseAre you Dr. Undesser?
Yes. Dr. Undesser Is very concerned about his patients. He wants to help you feel better. Listens to all your questions and he is very patient. He’s a great Dr. and I would recommend him to family and friends.
What went well
  • Listened & answered questions
What could be improved
No results
5 others found this helpful
Helpful
Everything was good – Jul 19, 2020
Thank you for the positive feedback! We love... Read More
×Post a ResponseAre you Dr. Undesser?
Dr Undesser was my husband's and my EP untill he left Idaho cardiology. So sad to see him go. He is a brilliant, no nonsense Dr. He tells it to you straight. He takes time to listen to his patients and works with them. His bedside manner might be a bit abrupt, but his skills and knowledge are impeccable. You won't find a better EP Cardiologist. My husband is on his fifth ICD, all but the last put in and managed by Dr. Undesser very effectively. Wish we could have had him do the last one. Very unhappy with the quality of care my husband now receives.
What went well
  • Listened & answered questions
  • Explained conditions well
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
7 others found this helpful
Helpful
Sarah J Barker – Jun 17, 2020
Thank you for the positive feedback. We... Read More
×Post a ResponseAre you Dr. Undesser?
I AM ALWAYS HAPPY TO SEE DR. UNDESSER =WHOM I HAVE HAD FOR SEVERAL YEARS. HE IS EASY TO TALK TO AND GIVES PRECISE ANSWERS. ALWAYS ASKS RE:MY GENERAL HEALTH AND ANY QUESTIONS I MIGHT HAVE.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
3 others found this helpful
Helpful
LYDIA M. BLACK – Jun 15, 2020
We truly value your feedback, thank you for... Read More
×Post a ResponseAre you Dr. Undesser?
It was my pacemaker check at home. It went very well.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Catherine Mooney – May 18, 2020
Thank you for taking the time to leave your... Read More
×Post a ResponseAre you Dr. Undesser?
I had a great experience with Dr. Undesser and his entire staff, they were very cordial and made me feel comfortable immediately. Dr. Undesser, in his no nonsense way explained my issues and remedies, in a plain and simple way. Thank you for your service. But i hope i see you as minimally as possible, over the next 20 years.:)
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
2 others found this helpful
Helpful
Dale Newberry – May 12, 2020
Thank you for the kind words, Dale! We will be... Read More
×Post a ResponseAre you Dr. Undesser?
This was a check on my defibrillator/pacemaker via telephone-I have been a patient of Dr. Undessor for more than 15 years. I have found him to be very professional and interested in my well being. I would recommend Dr. Undessor to anyone who would need his expertise.
What went well
No results
What could be improved
No results
Helpful
Ken Bowman – May 12, 2020
Thank you for your review of Dr. Undesser, Ken!... Read More
×Post a ResponseAre you Dr. Undesser?
Everything went smoothly except trying to contact the office by phone. The staff were quite friendly and helpful.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
1 other person found this helpful
Helpful
Glen Schofer – May 04, 2020
Thank you so much for the feedback! Glad to hear... Read More
×Post a ResponseAre you Dr. Undesser?
It was my yearly follow up . Dr Undesser and his staff listen. That is not my experience with most cardiologist. After a year of struggling with my issue and being told don't worry, I found Dr Undesser and have been with him ever since. He listens and addresses my concerns with knowledge and empathy.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
1 other person found this helpful
Helpful
Anita – Apr 23, 2020
Dr. Undesser's Reply –
Thank you for the kind words and feedback, Anita!
×Post a ResponseAre you Dr. Undesser?
Dr Undesser has been my cardiologist for many years and I highly recommend him. I have A pacemaker and have it checked personally by him every three months and my appointment is always a pleasant experience all staff is professional and on time and it Is always a pleasure to see Dr Undesser.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Betty M Sawyer – Apr 23, 2020
Thank you so much for the positive feedback! We... Read More
×Post a ResponseAre you Dr. Undesser?
Fairly quick meeting to discuss my condition. Dr. Undesser was straight to the point, thorough and explained my condition clearer than my previous providers. His no-non sense/no guarentee approach showcased his expertise and professionalism. I have no doubt I will be choosing him for my future appointments. Thank you Dr!
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
1 other person found this helpful
Helpful
Brazier – Mar 04, 2020
Thank you so much for the positive feedback! We... Read More
×Post a ResponseAre you Dr. Undesser?
My wife and I recently moved to area from Arizona and I needed to find a Cardiologist that I could be comfortable with. Dr Undesser was a good fit for my situation. He took the time to understand my condition fully and explained any options that would be available if required in the future. Could not be more pleased.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Jan 18, 2020
Thank you for your review! We value our... Read More
×Post a ResponseAre you Dr. Undesser?
Dr. Undesser is an excellent, patient care oriented, and to the point Cardiologist. Examination and discussion with him made errors in My wife's previous diagnosis and heart related treatment obvious.
What went well
No results
What could be improved
No results
Helpful
Jerry Kuhnhausen – Jan 14, 2020
Thank you so much for the positive feedback! We... Read More
×Post a ResponseAre you Dr. Undesser?
Dr. Undesser is absolutely one of the finest physicians that has ever treated me.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Dec 29, 2019
Dr. Undesser's Reply –
Thank you for the kind words!
×Post a ResponseAre you Dr. Undesser?
I found the office and was greeted very quickly and professionally by secretary at window. Filled out a short form, was asked to take a seat and that they would be with me shortly. i had brought a book as waiting times can be extreme. I had barely opened my book when the Doctors assistant asked me to follow her. I was quickly weighed and taken to an office. She took my blood pressure and asked if I had any questions or concerns. She said the Doctor would be right with me, closed door. Within 1-2 minutes the Doctor rapped on the door entered and did my consultation. He had obviously reviewed my charts before and asked i I had any questions or concerns. He suggested changing medications. Said everything looked good and stable and would need to see me in a year unless anything changed. Totally professional experience from start to finish. I would recommend them highly!!
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Greg McClean – Dec 03, 2019
Thank you for taking the time to share your... Read More
×Post a ResponseAre you Dr. Undesser?
Dr. Undersser is the best. He is always willing to listen to and give me his opinion on anything I have to go over with him. He is super patient and gives me the exact attention I need on my visits.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Monica – Nov 19, 2019
Thank you for the kind words and feedback,... Read More
×Post a ResponseAre you Dr. Undesser?
Great staff and Dr. Undesser is a great communicator as well as a skill doctor!
What went well
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Debra Curry – Nov 09, 2019
Thank you for the kind words, Debra! We love to... Read More
×Post a ResponseAre you Dr. Undesser?
I always feel comfortable seeing Dr. Undesser. He takes time to listen to me and is always friendly and caring
What went well
  • Explained conditions well
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
  • Didn't listen or answer questions
Helpful
Nov 06, 2019
Dr. Undesser's Reply –
Thank you for the kind words!
×Post a ResponseAre you Dr. Undesser?

Leave a review

How was your experience with Dr. Undesser?

Is this your profile?

Respond to reviews, add information, and reach more patients. Claiming is free and only takes a minute.

Claim your profile

Insurance Check

Search for your insurance carrier and choose your plan type

About Me

Watch Dr. Undesser's Video

care philosophy

Dr. Undesser is board-certified in internal medicine, cardiovascular disease and electrophysiology and has extensive research experience with several publications

biography

This physician is accepting telehealth visits. Karl P. Undesser, MD, is a board-certified cardiac electrophysiologist who has practiced medicine in the Boise area for over 18 years. He began his schooling in biology at the University of California,...read more
  • Cardiology

*Healthgrades does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.

  • University Of California At San Diego

    Fellowship Hospital
  • Duke University Medical Center

    Residency Hospital
  • University Of Texas - San Antonio Hsc

    Medical School, 1989
American Board of Medical Specialties®
American Board of Internal Medicine®
Cardiovascular Disease
Clinical Cardiac Electrophysiology
For detailed information about any of the below board actions, please search for the provider's records on the linked state licensing board or the Federation of State Medical Boards. To learn more about the difference between these sources, please refer to our FAQs.
Healthgrades has not received any data indicating a board action exists for this provider.

Dr. Undesser is a Healthgrades Choice provider in Cardiology

    Read our methodology

    Affiliated Hospitals

    • West Valley Medical Center

      1717 Arlington Ave
      Caldwell, ID 83605
      Recipient of 5
      hospital awards

      Patient Safety Excellence Award™ (2025, 2024, 2023)

      Top in the nation for providing excellence in patient safety by preventing infections, medical errors, and other preventable complications

      Outstanding Patient Experience Award™ (2023, 2022)

      Top in the nation for providing excellence in patient safety by preventing infections, medical errors, and other preventable complications

      View all awards

      How patients felt about the care they received at this hospital.

      88%
      Patients said they were given information about recovering at home

      4% higher than the national average

      78%
      Patients said that nurses always listened to them and explained things well

      3% higher than the national average

      View all patient feedback
    Learn more about how Healthgrades measures Hospital Quality