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Dr. John Mahmarian, MD

Dr. John Mahmarian, MD

Cardiology*
40+ years of experience

Dr. John Mahmarian, MD is a cardiologist in Houston, TX and has over 40 years of experience in the medical field. He graduated from NEW YORK Medical College in 1980. He is affiliated with Houston Methodist Hospital. He is accepting new patients and telehealth appointments.

4.8 Star Rating
Based on 17 reviews 4.8 Star Rating (17 reviews)

Houston Methodist DeBakey Cardiology Associates

6550 Fannin St Ste 1901 Houston, TX 77030
Telehealth available
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Compare with other Cardiologists

Compare Dr. Mahmarian with our nearby Cardiologists at HCA Houston Healthcare Medical Center.

Make an appointment at HCA Houston Healthcare Medical Center today at
(713) 352-2952.

Dr. Mahmarian 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

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Dr. Mahmarian's Reviews

Likelihood to recommend Dr. Mahmarian

4.8
17 ratings, 14 with a written review
5 star
94%
94%
4 star
0%
0%
3 star
0%
0%
2 star
6%
6%
1 star
0%
0%

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Dr. Mahmarian is always thorough and patient He is excellent about explaining any questions I have. I consider myself very fortunate to have such an excellent, knowledgeable and kind physician.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
Apr 08, 2025
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Dr. John Mahmarian is an excellent cardiologist ~ that kindly Teaches as he DIAGNOSES.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
Apr 08, 2025
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Dr. Mahmarian is an excellent doctor that really cares about the health of his patients. I fully trust him as a doctor and human being.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
Mar 19, 2025
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Dr.Mahmarian had been my doctor for the last 30 years, I am still alive.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
Feb 09, 2025
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Dr.Mahmarian is very kind and personable.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
Feb 04, 2025
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Dr. Mahmarian is very attentive and very knowledgeable in his field. I always feel like he listens to my questions and I leave feeling more informed about my condition and questions.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
Dec 20, 2024
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Dr. Mahmarian always spends time with me answering my questions and discussing issues I have.
What went well
No results
What could be improved
No results
Helpful
Oct 29, 2024
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Dr. Mahmarian is a great doctor. He shows attention and carful care to the patient and discusses in detail the conditions and the necessary treatment.
What went well
  • Explained conditions well
What could be improved
No results
Helpful
Jun 25, 2024
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Apart from the long wait time, everything is great. The Physician is a great doctor.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
Jun 06, 2024
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Dr. Mahmarian is an AMAZING Doctor. We have been seeing him for over 15 years. He is the best Doctor we have ever had he is very thorough very caring and listens to everything we have to say. He is definitely one in a million and we are so very blessed to have him as our Doctor.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
May 25, 2024
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Dr. Mahmarian is truly the most caring and best Doctor I have ever had!! I mean that from the bottom of my heart. He really cares about his patients. If I have a concern he listens asks questions and does everything In his power to fix the Issue. I truly trust him with my life. If he tells me to do something I know it is for my best interest and I definitely do as he says. We have been going to him for over 15 years and throughout that time he has given us many recommendations on other specialists to see and we couldn't be happier with them either. Dr. Mahmarian goes above and beyond to take care of us. He us a 1 in a million and Should be "Doctor of the Year"with Methodist.
What went well
  • Listened & answered questions
  • Explained conditions well
What could be improved
No results
Helpful
May 25, 2024
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Rude and condescending.
He treated me with disdain was extremely rude. He may have the technical skills, but he has no people skills. He ordered a bunch of expensive tests, gave no explanation, and there was no follow-up to explain the results. First and last visit.
What went well
  • Appointment scheduling
  • Staff friendliness
What could be improved
  • Didn't listen or answer questions
  • Didn't explain conditions well
Helpful
Disappointed – Oct 31, 2022
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Can't say enough wonderful things about this Dr in this small space. But I'll try. He's wonderful!! Dr. Mahmarian is a talented physician who treated us with kindness and respect and performed a comprehensive review of our case and made great recommendations and accomodations. I feel great about our visit and Left feeling understood and cared for and armed with knowledge for our future. Thank you Dr Mahmarian.
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
1 other person found this helpful
Helpful
Nancy & Tom – Jun 04, 2017
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He was very knowledgeable and took time to explain heart function and problems and answer all the questions I could throw at him.
What went well
  • Office environment
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
  • Staff wasn't friendly
2 others found this helpful
Helpful
Lawrence Ross Rucker in Katy, TX – Jan 14, 2016
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Know Before You Go

About Me

biography

Dr. John Mahmarian, MD is a cardiologist in Houston, TX and has over 40 years of experience in the medical field. He graduated from NEW YORK Medical College in 1980. He is affiliated with Houston Methodist Hospital. He is accepting new patients and telehealth appointments.

  • 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.

  • Baylor College Of Medicine

    Fellowship Hospital, 1986

  • Baylor College Affil Hospital

    Residency Hospital, 1983

  • Baylor College Affil Hospital

    Internship Hospital, 1981

  • New York Medical College

    Medical School, 1980
American Board of Medical Specialties®
American Board of Internal Medicine®
- 
Cardiovascular Disease
- 
Internal Medicine
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.

Healthgrades receives board action history for physicians and physician assistants. The information displayed here is sourced from independent information providers, such as state board websites, and may not be the most up-to-date information. Healthgrades makes no representations with respect to the accuracy of any information provided here and assumes no responsibility or liability for such information.

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Dr. Mahmarian is a Healthgrades Choice provider in Cardiology

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    Locations

    Houston Methodist DeBakey Cardiology Associates

    Houston Methodist DeBakey Cardiology Associates6550 Fannin St Ste 1901 Houston, TX 77030
    1
    (713) 441-1100
    See all Cardiologists in Houston, TX