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Sean C. Halligan

Sean C. Halligan, MD, FACC, FSCAI

Cardiology, Cardiovascular Disease, and Interventional Cardiology
4.6 / 5 (Based on 276 Ratings) Read Reviews | Learn More

Office Information



University of Nebraska College of Medicine, Omaha, Medical School


Mayo Clinic, Rochester, MN, Internal Medicine


Mayo Clinic, Rochester, MN, Cardiology

Professional Memberships

Fellow, American College of Cardiology; Fellow, Society for Cardiac Angiography and Interventions


American Board of Internal Medicine; Board of Cardiovascular Computed Tomography; Subspecialty in Cardiovascular Disease; Subspecialty in Interventional Cardiology


August 16, 2022
All of the...all of the staff was extremely courteous, professional, and kind. They seemed very receptive to what we were saying. And even though we were early, we were fitted in well to their schedule, and we very much appreciated that.
June 22, 2022
Positive experience.
June 07, 2022
I like doctor. The doctor very well and he was a tentative and he answered my questions and he acted like he would like to take me as a patient and he felt that he just acted like he cared and I thought Dr. Halligan was very pleasant and I am looking forward to having him as my Cardiology provider. Thank you. Bye bye.
May 24, 2022
Staff was very friendly and provided good accurate service in great timing.
April 22, 2022
Doctor explained my problem in layman terms, which was very helpful to me.
April 22, 2022
Dr. was very easy to relate to.
April 13, 2022
I was very satisfied
April 13, 2022
Overall the experience was really good. My doctor is very, very knowledgeable. The only thing maybe is sometimes is the physician's need to remember, not that they're not busy, but they need to realize that many of the patients. Most of us it 's our first time encountering this type of situation. So, making sure that we're at ease and understanding everything is a really a big plus. For these doctors to do this every day. It's probably a little more calm and comfort for them. But for us as a being a patient, it's important that they realize it's a bit overwhelming. We don't know a lot about the situation we're in. But otherwise I was very happy with the whole process in general.
April 08, 2022
Dr. Halligan is very well qualified for what he's doing. He's a super super doctor or cardiologist. Thank you.
March 14, 2022
Everyone was very compassionate to me with my recent loss of my pet.
March 04, 2022
highly efficient and friendly staff
March 04, 2022
Professional service!
February 01, 2022
Very positive experience.
January 31, 2022
I had an ultrasound added and the staff was able to find a slot for me that day and also schedule my angiogram 4 days after my first appointment. my spouse is dealing with a new cancer diagnosis, so getting my issues resolved in a timely fashion is a great help to us....THANK YOU
January 18, 2022
really appreciated Dr Halligan and his care for me
January 03, 2022
The only concern I had was that the medical assistant had some perfume or something on and I am allergic to perfume. So that would have made the experience more pleasant but that was all. Everything else was good.
November 30, 2021
Yes, I like when, I when I the doctor will fit there and and listen to what my concerns are and I hope if I ever come in there in the future that I'll be able to see the doctor in person that means a lot to me that would be all I have to say right now so thank you.
November 09, 2021
Dr. Halligan is probably one of the best doctors that I've ever had in my life, just to let you know. And he actually save my life. I guess, if you will, no one will ever really know, but there's probably none better than him in my history if you will. Thank you.
September 13, 2021
I did not encounter one person during my visit who was kind or empathetic. I felt dismissed.
June 16, 2021
I found everyone from front desk to check very kind.
June 07, 2021
My experience was as good as could be expected considering Sanford failed to send over important tests.
May 27, 2021
I really think that he was just about the best doctor I have ever seen. I really, really liked it.
May 25, 2021
I just felt that everybody was very well organized. The experience did not take a long time. I didn't have to wait long at all and everybody was very friendly and helpful and informative.
May 13, 2021
I was seen promptly and the physician was very knowledgeable and clear about his communication.
April 20, 2021
All staff members were incredibly polite, got their jobs done efficiently and quickly, there was a very small wait time. I was done and out of the building before my actual appointment time. very well organized
April 19, 2021
Everyone was kind and courteous from the people when I checked in and the people that took my insurance. And the people that scheduled my appointments and provided services for me. They listen to me, they were professional, they were nice, and they kept everything clean. And they barely kept me waiting. So I enjoyed my visit.
April 16, 2021
Well, I was not feeling too good in there because of my ears and symptoms. So, I don't think I quite actually listen very good from my own perspective, but he just got a job if he could do I think with me that day and I think it very much. Thank you, Dr. Halligan. Bye.
April 15, 2021
I was very impressed with the... speed and the quickness of everything tests... admission... seeing the doctor... The nurse for the doctor that day was wonderful. Thank you.
April 13, 2021
I think you did a real good job. He was real patient with me and everything else. I like them really well.
March 08, 2021
Very patient.
March 05, 2021
Okay, when I... my appointment was fine and it was great. But when I checked into the facility to the Heart Hospital itself- the gal that helped me, she registered me under a wrong name. I gave her my name and she went through the file, yes, here it is. And I waited through probably 10 people being called an interviewed doing her paperwork. And I went and asked if I was registered right and I was not. And I sat probably 25 minutes- Just waiting. Yes, very dissatisfied with the check in.
March 05, 2021
This is my 1st visit. I was impressed by Dr. Halligan nurses the tech that did my EKG and Dr. Halligan and I was especially impressed by him. He's very thorough did a lot of teaching showed lot of care. I will definitely recommend him to anyone that needs a Cardiologist. Thank you very much.

This directory contains information about the provider members of Independent Health Care Associates, Avera Health and all Avera entities, members of the Avera Medical Group, and employed select providers with Avera McKennan, Sioux Falls, SD and Avera Marshall, Marshall, MN and physicians with hospital privileges at Avera St. Luke's, Aberdeen, SD; Avera Sacred Heart, Yankton, SD; Avera Queen of Peace, Mitchell, SD; Avera St. Mary's, Pierre, SD.

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