Dr. John Isaac, MD

Cardiology  |  
Male  |  
Age 50
Insurances AcceptedSave
Dr. John Isaac, MD
Dr. John Isaac, MD is a cardiology doctor who practices in Houston, TX. He is 50 years old and has been practicing for 23 years. Dr. Isaac is affiliated with Houston Methodist Hospital .

6560 Fannin St Ste 620

Houston, TX 77030

Contact Information
Dr. John Isaac, MD

Dr. John Isaac, MD

Accepted insurance

  • Aetna
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of Texas
  • Cigna
  • First Health (Coventry Health Care)
  • Humana
  • MultiPlan

*Please verify this information when scheduling an appointment.

Learn about Dr. Isaac

Dr. Isaac's Experience

Dr. Isaac's experience matches your search based on the following criteria:
  • Based on total number of patients treated over the last 12 months
  • Specializes in Cardiology
  • No malpractice claims found
  • No sanctions found
  • No board actions found


  • Cardiology
  • Interventional Cardiology

Board Certifications

Dr. Isaac does not have any board certifications listed.


Conditions Treated

  • Aneurysm
  • Angina and Acute Coronary Syndrome
  • Aortic Aneurysm
  • Aortic Dissection
  • Aortic Ectasia
  • Aortic Embolism and Thrombosis
  • Aortic Valve Disease
  • Aortic Valve Regurgitation
  • Arrhythmias
  • Atrial Fibrillation
  • Atrial Flutter
  • Autonomic Disorders
  • Cardiomegaly
  • Cardiomyopathy
  • Carotid Artery Disease
  • Chest Pain
  • Chronic Pulmonary Heart Diseases (incl. Pulmonary Hypertension)
  • Congenital Heart Defects
  • Congenital Heart Disease
  • Congestive Heart Failure
  • Coronary Artery Disease (CAD)
  • Endocarditis
  • Heart Attack (Acute Myocardial Infarction)
  • Heart Disease
  • Heart Murmur
  • Heart Palpitations
  • Heart Tumors, Malignant
  • Hyperlipidemia
  • Hypertension
  • Hypertensive Chronic Kidney Disease
  • Hypertensive Heart Disease
  • Hypertensive Heart and Chronic Kidney Disease
  • Hypotension
  • Limb Swelling
  • Limb Swelling Caused by Fluid Overload
  • Mitral Valve Disease
  • Mitral Valve Regurgitation
  • Mitral Valve Stenosis
  • Pericardial Disease
  • Primary Pulmonary Hypertension
  • Pulmonary Disease
  • Pulmonary Edema
  • Pulmonary Hypertension
  • Pulmonary Valve Disease
  • Septal Defect
  • Syncope
  • Thrombosis
  • Tricuspid Valve Disease
  • Vascular Disease


Read More


  • Automatic Implantable Cardioverter Defibrillator (ICD) Implantation
  • Cardiac Catheterization (incl. Coronary Angiography)
  • Cardiac Electrophysiology
  • Cardiac Imaging
  • Cardiac MRI (Magnetic Resonance Imaging) of Heart or Chest
  • Cardiac Myocardial Perfusion Imaging
  • Cardiovascular Stress Test
  • Cardioversion, Elective
  • Cardioverter-Defibrillator or Pacemaker Insertion, Removal or Repair
  • Chest CT (incl. Heart and Lungs)
  • Coronary Angioplasty, Atherectomy and Stent
  • Non-Coronary Angioplasty, Atherectomy, and Stenting
  • Pacemaker Insertion or Replacement
  • Peripheral Artery Catheterization
  • Removal or Revision of Pacemaker or Cardioverter and-or Defibrillator
  • Thoracentesis
  • Tilt Testing or Cardiac Event Monitors
  • Valve Repair or Replacement (Aortic, Mitral, Tricuspid, and Pulmonary)
  • Vascular Duplex Ultrasonography and Plethysmography

Background Check

0 Malpractice Claims

No malpractice history found for Texas.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • University Of Texas Southwestern Medical Center At Dallas
    Medical School | Graduated 1994
  • Johns Hopkins Hospital
    Internship Hospital | Completed 1995
  • Johns Hopkins Hospital
    Residency Hospital | Completed 1997
  • Baylor College Of Med
    Fellowship Hospital | Completed

Awards & Recognition

Awards & Honors

Dr. Isaac has no awards or honors listed.

Media & Publications

Dr. Isaac has no media or publications listed.

Languages Spoken

  • English
  • Spanish

Memberships & Professional Affiliations

Dr. Isaac does not have any memberships or affiliations listed. If you are Dr. Isaac and would like to add memberships or affiliations, please update your profile.

Dr. Isaac's Reviews

Likelihood of recommending Dr. Isaac to family and friends
based on 29 total reviews (9 with comments)
Dr. Isaac's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    31 to 45 minutes
Patient Comments (9)
in Houston, TX |
Dr. Isaac and his staff @ Willowbrook Cardiology have been great! He takes the time to listen and answers all of my questions in plain english that I can understand. He is a busy Physician, and sometimes I end waiting a bit longer than I'd like in the waiting room, but I understand other patients have questions they want answers to, so I wait. His support staff have been great also, even the team members doing the stress testing! Randy
Tomball, TX |
Everything I look for in a doctor--shows highest levels of concern, candor, and competence. I consider him the best doctor I've ever dealt with regardless of specialty. Wait times can be a little long if you're in a hurry to get back to work, but the level of care is simply top of the line in my opinion.
Houston, TX |
Went to see Dr. Isaac last December for the first time. As a new patient, I was worried about my transition from my old doctor to Dr. Isaac. I can surely say that Dr. Isaac was a great choice for my health. Dr. Isaac spent a lot of time going over my labs, explaining the different routes we could use to counter my heart issues. Thank you Dr. Isaac for making me feel special rather than just another patient for the day.
Tomball, Texas |
My experience was poor from the first visit through the last. The wait time was intolerable, and the office staff was rude and unhelpful. The cost for procedures was significantly more than other doctors in the area charge and I have spent hours trying to sort out the errors in my bill. Finally, the doctor completely forgot the purpose for my visit between the diagnostic procedure and the follow up. After tremendous expense and effort, I am still unsure about my heart health.
in Spring, TX |
I have been a patient of Dr. Isaac since I was 35 (15+ years). I think he is an excellent cardiologist!! He now sees my sons and my husband as well. Highly intelligent and very knowledgeable. He listens and I think he truly cares about his patients. He explains what my disorders are, what they cause, and how the medicine works to treat them. His practice is very, very busy which can make wait times very long sometimes. For me, the wait is well worth the exceptional patient care he provides.
in Tomball, TX |
Brilliant, responsive, inspiring! After reviewing my monitor results, Dr I called late PM. He cleared appts. for next AM, to potentially implant a pacemaker for my low heart rate, multiple missed beats, and a congenital heart murmur. Dr. I. reviewed family health history, my dedicated work-out regimen, and successful results of extensive tests (incl. echo, EKG, and stress test), concluding no pacemaker was warranted! Impressive attention to detail and critical thinking to adjust course!
in Houston, TX |
Office staff is disorganized, dishonest, and can't keep up with payments, fails to schedule test ordered by doctor. Wait time is 2-3 hours in front office, then another 45-60 minutes in waiting, finally when Dr. Isaac sees you, he spares about 5-7 minutes of his time, and leaves you clueless as to how your results turned out.
in Spring, TX |
Dr. Issac is a great cardiologist but his wait time are intolerable. And it seems that they are just getting worse. He is thorough and extremely bright and has a terrific bedside manner. I just wish you didn't have to spend a half day waiting for an appointment. Its discouraging since i don't think there are many who are better!
Houston, TX |
Wait times are ridiculously long - 2 1/2 to 3 hours. No one, especially my 87 year old mother should have to wait this long. We are changing cardiologists.
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Now Accepting New Patients
Dr. Isaac accepts 7 insurance carriers
  • Aetna
    Aetna HMO
    Choice Plus POS II
  • Blue Cross Blue Shield
    Blue Card PPO
  • Blue Cross Blue Shield of Texas
    Blue Choice
  • Cigna
    Cigna HMO
    Cigna PPO
    Open Access Plus
  • First Health (Coventry Health Care)
    First Health (Coventry Health Care) PPO
  • Humana
    Choice Care PPO
  • MultiPlan
    MultiPlan PPO
    PHCS Network PPO

*Please verify this information when scheduling an appointment.

Hospitals where Dr. Isaac has admitting privileges

Houston Methodist Hospital
6565 Fannin St
Houston, TX 77030
View Hospital Profile