Justin Tze-Howe Mao, MD

Specialty: Cardiac ElectrophysiologyCardiology

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Justin Tze-Howe Mao, MD

Specialty: Cardiac ElectrophysiologyCardiology

Independent practitioner Advocate Medical Group provider

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Primary location

801 South Washington Street

4th Floor

Naperville, IL 60540

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Office: 630-527-2730

Fax: 630-527-2754

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3825 South Highland Avenue

Tower 2 - 4th Floor

Downers Grove, IL 60515

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Office: 630-719-4799

Fax: 630-963-7420

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1512 North Naper Boulevard

Suite 176

Naperville, IL 60563

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Office: 630-526-2730

Fax: 630-526-2726

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Meet Justin Tze-Howe Mao, MD

About me



  • Henry Ford Hospital; Cardiovascular Disease & Cardiac Electrophysiology
  • Boston Medical Center; Internal Medicine
  • Chicago Medical School

Board certifications

  • Cardiac Electrophysiology

Hospital affiliations

  • Advocate Good Samaritan Hospital

Insurance accepted

  • AAH Preferred – Team Member Plan
  • AAH Select – Team Member Plan
  • AARP Medicare Advantage Access HMO
  • Aetna Better Health Premier Plan MMAI
  • Aetna Coventry (Aetna Medicare) HMO
  • Aetna EPO
  • Aetna HMO
  • Aetna Managed Choice (MC) POS
  • Aetna Medicare HMO
  • Aetna Medicare POS
  • Aetna Medicare PPO
  • Aetna Medicare Value Plan PPO
  • Aetna NAP - PPO
  • Aetna Open Choice PPO
  • Aetna POS
  • Aetna Premier Care Network
  • Aetna Select
  • Aetna Signature Administrators PPO
  • Aetna State of Illinois HMO
  • Aetna State of Illinois Open Access Plus
  • Aetna State of Illinois PPO
  • Aetna Value Performance Network
  • Beech Street Network PPO
  • Benefit Plan Administrators (BPA)
  • Benefits Services and Systems, Inc
  • Blue Advantage HMO
  • Blue Cross Community FHP
  • Blue Cross Community ICP
  • Blue Cross Community MMAI
  • Blue Cross HMO Illinois
  • Blue Cross Med Select PPO
  • Blue Cross Medicare Advantage HMO
  • Blue Cross Medicare Advantage HMO-POS
  • Blue Cross Medicare Advantage PFFS
  • Blue Cross Medicare Advantage PPO
  • Blue Cross Medicare Supplement PPO
  • Blue Medicare Advocate Health HMO
  • Blue Precision HMO
  • BlueCare Direct
  • Cigna APWU Health Plan Open Access Plus
  • Cigna EPO
  • Cigna Health Partners POS
  • Cigna Healthspring True Choice PPO
  • Cigna HMO
  • Cigna NALC Health Benefits Plan
  • Cigna Open Access Plus
  • Cigna Open Access POS
  • Cigna POS
  • Cigna PPO
  • Cigna-HealthSpring Medicare Advantage HMO
  • Cofinity PPO
  • Coventry / FirstHealth
  • Coventry Health Care HMO
  • Coventry Health Care Open Access POS
  • Coventry Health Care POS
  • Coventry Health Care PPO
  • First Health Network PPO
  • FirstHealth / Coventry Personal Care
  • Galaxy Health Network PPO
  • Great West Healthcare - Cigna EPO
  • Great West Healthcare - Cigna PPO
  • HealthLink PPO
  • HealthSmart Preferred PPO
  • HST Care Connect EPO
  • HST Care Connect PPO
  • Humana Choice POS
  • Humana Community Select HMO
  • Humana HMO
  • Humana Illinois CCN HMO
  • Humana Medicare Advantage HMO
  • Humana Medicare Choice PPO
  • Humana Medicare Gold Plus HMO
  • Humana Medicare Supplement Plan
  • Humana MMAI
  • Humana National HMO
  • Humana National POS
  • Humana National POS - Open Access
  • Humana POS
  • Humana PPO
  • Medicare
  • Meridian
  • Meridian MMAI
  • MultiPlan PPO
  • SEIU – Local 4 HMO
  • SEIU – Local 4 PPO
  • Tricare Prime
  • UFCW Local 1546 Health and Welfare Fund (UMC)
  • UHC / AARP Medicare Advantage Value HMO - POS
  • UHC / AARP Medicare Complete HMO
  • UHC / AARP Medicare Complete Plan 1 HMO
  • UHC / AARP Medicare Complete Plan 2 HMO
  • UHC / AARP Medicare Supplement
  • UHC National Railway Carriers & United Transportation Union Health and Welfare
  • UHC Railroad Employees National Health & Welfare Plan
  • UHC/ AARP Medicare Advantage Choice PPO
  • UniCare PPO
  • Union Health Services, Inc.
  • Union Medical Care PPO
  • United Health One Golden Rule
  • United Healthcare Charter HMO
  • United Healthcare Choice Plus PPO
  • United Healthcare Choice PPO
  • United Healthcare Core PPO
  • United Healthcare Group Medicare Advantage PPO
  • United Healthcare Indemnity
  • United Healthcare Medica
  • United Healthcare Medicare Complete Assure PPO
  • United Healthcare Navigate HMO
  • United Healthcare NexusACO OA
  • United Healthcare NexusACO R
  • United Healthcare Options PPO
  • United Healthcare Oxford
  • Wellcare Health Plans HMO

Ratings and reviews

Overall rating

based on 367 patient ratings.


July 27, 2020 4:58 PM

He was very straight forward in giving me the facts related to the new prescription I would be taking.

July 15, 2020 10:20 PM

Dr. Mao always hears me out. He listens carefully and attentively. Then, he will respond in kind with clear and concise answers. I appreciate his no-nonsense approach, but he still retains his sense of humor. He has given me his direct phone number and always answers my questions by text or voice whenever necessary.

June 22, 2020 9:23 AM

Dr. Mao is excellent He states the problem, gives his choice of the best sol'n, and asks my opinion. At times, I wish he was a LITTLE more personable (but I understand that his time is important).

June 15, 2020 1:31 PM


June 3, 2020 10:33 AM

I have very high confidence in my cardiologist Dr. Justin Mao.

June 2, 2020 12:34 PM


May 28, 2020 1:57 PM

Very good!

May 20, 2020 9:48 PM

Dr. Mao is an excellent listener and medical provider. However, the speed at which he speaks is a little fast. Slowing his rate of speech would be helpful to me to more effectively process the information that he is sharing. Thank you.

May 20, 2020 9:48 PM

Dr. Mao, keep up your great work. Visiting with you via phone was excellent.

May 13, 2020 10:29 AM

The emergency at Edward is marvelous and all of the staff there are very helpful and caring.

May 13, 2020 8:48 AM

Dr. Mao is a caring doctor.

May 11, 2020 8:52 PM

I'm please in having Dr J Mao as my cardiologist He has shown great concern sense day one as me coming in as a new patient....

May 11, 2020 8:52 PM


May 4, 2020 2:08 PM

Dr Mao is a great cardiac doctor to have. I would recommend this doctor to my family and best friends.

May 4, 2020 2:08 PM

Great experience

April 19, 2020 7:17 PM


April 6, 2020 2:10 PM

Showed concern and provided me with our next step.

April 2, 2020 5:34 AM

Dr. Mao performed an ablation in January 2019. Since then I have not experienced any incidents of AFIB. I'm forever grateful for his skill and concern for my situation.

April 2, 2020 5:34 AM

I feel comfortable talking to Dr. Mao. I'm especially glad that because of his successful ablation I can now see him and my cardiologist Dr. Ramanathan every 12 months instead of every six.

March 15, 2020 6:23 AM

Good visit.

February 25, 2020 9:49 AM

Given he was not my usual provider for my yearly pacemaker check he was well informed and very competent.

February 10, 2020 2:30 PM

Dr Mao very well versed on state of the art medicine and longevity.

February 10, 2020 2:30 PM

Very good Doctor. I have recommended DrMao to others.

February 7, 2020 11:49 AM

I feel extremely comfortable with my health care needs in the hands of Dr. Mao and his staff.

January 13, 2020 7:28 PM

I do believe that this doctor was more attentive to my questions this visit, I still do not have an understanding of the symptoms I do feel. It would have been helpful for him to give me indications that would help me understand when (or how) the symptoms that I feel might indicate that I have a problem with my heart.

January 6, 2020 3:15 PM

Dr. Mao is very courteous and knowledgeable.

January 6, 2020 3:15 PM

I had a bad experience with the front desk receptionist- I believe her name is X. My appointment was made under my maiden name, which seems obvious enough to figure out, but she not only turned me away from the office (told me to leave and call someone to figure out when/where I had an appointment), but went as far as to tell me Dr. Mao wasn't even in the office this day seeing patients and also that he would have never have ordered the heart monitor I claimed I wore earlier in the week. Basically, she made me feel like I was just making stuff up and she took no measures to help resolve my concerns. I showed up at 11:40 for my noon appointment and after no assistance from her and me finally calling the office, someone else (very helpful woman) got it sorted out promptly and I was seen just after 12:30. It caused for unnecessary stress and wasted time for everyone. It was an awful first experience with the office, however the rest of the team and appointment went smoothly.

December 28, 2019 10:57 AM

Dr Mao treats multiple family members. he is always compassionate, thorough and offers options for treatments along with the pro's and con's. He does talk a little fast, which can make it difficult to absorb negative test results but he always asks if we have questions and is happy to re-explain the information until we understand.

December 28, 2019 10:57 AM

We fully trust Dr Mao.

December 23, 2019 3:17 PM

All went well and very informative

December 23, 2019 3:17 PM

I say all was good and very understanding

December 21, 2019 9:03 AM

I was in the hospital overnight & he came to see me & he actually asked me why were you in the hospital? I didn't know that. Interesting.

December 17, 2019 11:30 AM

always a conforting and informitive experience

December 17, 2019 11:30 AM

nice doc, and very helpful

December 10, 2019 5:44 PM

My appointment was for 3:45pm. I arrived at the doctor's office at 3:25pm. I was walked to one of the examination rooms at 3:38pm. The nurse weighed me, took my blood pressure, and heart rate. She was very friendly. Dr. Mao met me at 3:44pm. This is a tremendous difference from my last routine visit where I waited almost an hour past my scheduled appointment. At this most recent appointment (12/6/19) the doctor and I had small talk about the upcoming holiday and family. He asked me about my medication, listened to my heart, and explained a possible surgical procedure I may want to consider to correct my A-fib. Overall, the appointment was pleasant and much improved compared my previous experience at with Dr. Mao about six month earlier.

December 10, 2019 5:44 PM

Overall, the appointment went very well. The doctor said I should make my next routine check up appointment a year from now rather than every six month. I made an appointment for November 2020.

December 9, 2019 3:37 PM

all good!

November 26, 2019 9:33 AM

I have previously had many problems navigating Midwest Heart administrators and nurses. it's very hard for a new patient to get through the maze but I'm learning and it's going better now that I'm feeling better. At first I felt like I was an EKG number.

November 16, 2019 9:06 PM

Dr Mao and the nurse were wonderful in helping to provide a second look at my heart health before my knee replacement. I am doing great after the surgery. thanks for taking me so quickly under such a short appointment period!!!!!!

October 26, 2019 7:00 PM

There was a lot of patients arriving at 8 so they called in additional help. I had a nice person who was familiar with the check in process so I sat for 30 min. past my appt. time and I came 20 min. early.

October 22, 2019 7:00 PM

All visits & experience with Dr. Mad have been excellent. He is my "pacemaker" doctor.

October 20, 2019 7:00 PM

Dr. Mao and his staff were wonderful!!

October 16, 2019 7:00 PM

Dr. Mao is an excellent heart specialist and I will continue to go back to him for his services.

October 10, 2019 7:00 PM

Dr. Mao is a very capable heart doctor.

September 29, 2019 7:00 PM

Extremely intelligent & knowledgeable. Very attentive & caring. Made me feel comfortable & assured with problem I presented.

September 29, 2019 7:00 PM

provider seemed to be rushed on to the next patient

September 27, 2019 7:00 PM

Dr. Mao has been great!

September 25, 2019 7:00 PM

Provider addressed my concerns.

September 22, 2019 7:00 PM

excellent care very professional

September 22, 2019 7:00 PM


September 22, 2019 7:00 PM

All my experiences with this provider are excellent.

September 4, 2019 7:00 PM

Lukewarm. He seemed bored and talked REALLY fast. I had to ask him to repeat himself. It's a lot to absorb!!

August 28, 2019 7:00 PM

Very professional. Set up an appointment for 1 year. Dr. Mao listed symptoms to watch for and to contact his office immediately should I experience any of those symptoms.

August 25, 2019 7:00 PM

Pacemaker testing and then visit by heart doctor went very well.

August 23, 2019 7:00 PM

He was nice, competent, and efficient.

August 17, 2019 7:00 PM

As usual, he's in and out in a few minutes or less.

August 13, 2019 7:00 PM

Very good doctor.

August 11, 2019 7:00 PM

Good experience, friendly staff.

July 28, 2019 7:00 PM


July 18, 2019 7:00 PM

Dr. Mao is a wonderful provider. He listens and we both assess what is going on & take steps to correct it. I feel he always listens to my concerns & spends time going over everything.

June 28, 2019 7:00 PM

I came to this office after seeing another heart specialist that I wasn't pleased with. my wife goes to this office. very glad I switched.

June 25, 2019 7:00 PM

The doctor and nurse are very good. The office staff was rude and made me wait.

June 23, 2019 7:00 PM

Dr Mao seemed to be rushed during this visit. Not much was said between us. Last appt he wanted me to have an Echo but due to family obligations out of state for the last 3 months I was not able to do. Subsequently, my family member died and now I have moved back to my home in Illinois. I assured Dr Mao I would be able to do test now.

June 19, 2019 7:00 PM

Great all was covered about my concerns.

June 10, 2019 7:00 PM

Excellent care! Instilled confidence! GREAT communication. GRATEFUL to him. Thankful to have him on my heart care team. The BEST!

June 7, 2019 7:00 PM

great listener. really shows he cares

May 29, 2019 7:00 PM

Would like dr. to spend more time with me, being that I'm old (84) and being a slow thinker, dr. needs to spend time with patient.

May 26, 2019 7:00 PM

whatever new system your converting to sucks. spent more time checking in than I did with the doctor.

May 17, 2019 7:00 PM

Excellent provider

May 9, 2019 7:00 PM

This provider was informed and experienced. Explored several options and discussed each one to inform my decision. Listened and answered my questions and concerns. Left feeling comfortable to make my decision in a few days based on information given.

May 5, 2019 7:00 PM

Was very good.

April 28, 2019 7:00 PM

Dr. Mao was as pleased with my ablation result as I am.

April 26, 2019 7:00 PM

Irregular heart beat. Skips beats. Last appt I believe, of day. Asst. was very good. Dr Mao shook my hand. Took Asst give me ECG. 48 hour monitor. I showed him a list that I felt was important. Glanced at it and left it.

April 21, 2019 7:00 PM

The doctor is good, the office is frustrating.

April 21, 2019 7:00 PM

I waited about an hour.. the Dr did not have my test results. and he was very rushed when he finally came in. I don't feel confident in making a decision about the next step that he offered

March 24, 2019 7:00 PM

Dr Moa is my cardiologist that I feel is very knowledgeable and has a genuine concern for my health.

March 18, 2019 7:00 PM

For my Ecocardiogram the technician was very cold and impersonal. I was then kept waiting for 45 minutes for my heart monitor appointment because that technician was running late. At no time did she apologize for being so late or keeping me waiting. My visit with Dr. Mao was fine, my best experience was with his nurse.

March 11, 2019 7:00 PM

new system start so much confusion!

January 8, 2019 6:00 PM

Due to a flare up of my AFIB I was told to come into the office as a walk in. Although it was expected that I would have to wait longer than usual I was treated with respect and concern. Everything worked out for the best and it was a good thing that I was asked to come in and be seen.

December 25, 2018 6:00 PM

Dr. Moa takes time to listen. Is not rushing you out the door to go to the next patient.

December 3, 2018 6:00 PM

No complaints. Dr. Mao knows what he is doing. I am very satisfied with Dr. Mao.

November 25, 2018 6:00 PM

The experience was very good and it made me comfortable ever since my heart went into a-fib last year. I have much confidence in the direction my provider gives me.

October 31, 2018 7:00 PM

Dr. Mao is fast but to the point. if I had more questions i'm sure he would answer them. Not much of a physical examination, i.e. quick listen to the heart, but maybe he is going by info from the pacemaker.

October 21, 2018 7:00 PM

I found Dr. Mao to be helpful and took his time to explain things. He answered all my qeustions and laid out a couple options and was open to hear my feedback.

October 20, 2018 7:00 PM

I have total confidence in Dr. Mao. However in general this group lacks in many areas.

October 19, 2018 7:00 PM

Very caring and understanding. Make you feel your health is important. A intelligent caring person as well as a good doctor. Good patient relationship.

October 19, 2018 7:00 PM

I like Dr. Mao very much. He seems to listen to what I have to say and take it into consideration. He is friendly and seems to know what he is doing.

October 14, 2018 7:00 PM

Dr. Mao seems to listen; however, he is rather poor with communications. He doesn't explain findings well. He doesn't explain process well. He doesn't explain treatment plans well. He just put me on a new medication and on a heart monitor for only 2 days to see how the heart reacts to the med. But he didn't tell me what time to take the med. If I waited until bedtime, that would only give 24 hours on the med. I had to ask how I would be further directed: stay on med? change dosage? stop? l found out at the scheduling desk that I'm not even to come back until 1 year. I'd previously been told I'd be on a 6-month schedule. Dr. Mao is a poor communicator and is very confusing.

October 12, 2018 7:00 PM

easy to talk to as he listened and showed concern

October 7, 2018 7:00 PM

My experience with Dr. Mao has been very, very good. I was somewhat traumatized over a previous evaluation from a previous provider.Dr. Mao calmed me immediately. In my first visit he explained that A-Fib is always taken seriously and proceeded to tell me what the next step would be. He went over my prescriptions, explained the purpose of each, changed some and scheduled follow-up appointments--one with a Nurse Practioner and one with him. After 3 months I met with Dr. Mao again and received the summary of that visit the same afternoon that concluded I "was completely asymptomatic". Once again Dr. Mao reassured and calmed me. My experience with Dr. Mao and my husband's more serious experience with Dr. X were outstanding! I would like to learn more about The Advocate Medical Group. Thank You!

October 7, 2018 7:00 PM

I feel this office provided me with the best care I need at the time

October 7, 2018 7:00 PM

Dr. Mao was very pleasant and professional. He is a very knowledgeable and competent doctor.

October 2, 2018 7:00 PM

Dr. Mao was very informative & helpful I like him.

September 30, 2018 7:00 PM

Dr. Mao was very informative. Let us know what our problem was, and what our next step was.

September 18, 2018 7:00 PM

Dr. Mao is a very compassionate & caring man. I would recommend him to anyone dealing with AFIB.

September 16, 2018 7:00 PM

Dr Mao is always respectful, knowledgeable about my history, calming, able to answer my questions, willing to take time to answer questions and concerns. The girl scheduling my stress test was not friendly while doing the scheduling with me. Actually, she was rather testy. I did not appreciate that. Other than that encounter my visit was fine.

September 7, 2018 7:00 PM

I'm glad to find answers to my health related symptoms.

September 3, 2018 7:00 PM

I chose this office because I bought my parents here.I really like this provider.

August 24, 2018 7:00 PM

Excellent as usual! He literally saved my life due to my heart condition.

August 19, 2018 7:00 PM

Excellent patient management; knowledgeable and informative. Answered questions.

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Information listed under the "clinical interests" columns was supplied by the physicians. It is provided to you for informational purposes only, and neither Advocate Health Care nor the Advocate facility has independently verified the information. If you wish to confirm the information contained herein, or if you have any other questions about a particular physician, please contact the physician’s office.

Unless otherwise stated, physicians are independent practitioners who are not employees or agents of Advocate Health Care or the Advocate facility where the care is being provided. Neither Advocate Health Care nor the Advocate facility shall be liable for the medical care provided or decisions made by these independent physicians.

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