Dr. John C. Isaac, MD

Dr. John C. Isaac, MD

Cardiology | Male | 50 years old

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Care Philosophy

Dr. Isaac specializes in Cardiology and practices in Houston, TX. He practices at 2 locations.

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Dr. Isaac's Experience

Experience Match

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Conditions Treated

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Procedures Performed

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Background Check

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Languages Spoken

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Memberships & Professional Affiliations

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Visiting Dr. Isaac

Dr. Isaac accepts 17 insurance carriers

Affiliated Hospitals

Hospital Quality

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Hospital Quality Awards


Dr. Isaac's Reviews

Likelihood of recommending Dr. Isaac to family and friends
based on 27 total surveys (7 with reviews)
Key Survey Insights
  • Trustworthiness
  • Helpfulness
  • Staff
  • Scheduling
Experience with Dr. Isaac
  • Level of trust in provider's decisions
  • How well provider explains medical condition(s)
  • How well provider listens and answers questions
  • Spends appropriate amount of time with patients
Dr. Isaac's Office & Staff
  • Ease of scheduling urgent appointments
  • Office environment, cleanliness, comfort, etc.
  • Staff friendliness and courteousness
  • Total wait time (waiting & exam rooms)
    31 – 45 minutes (26)
Open Full Survey+
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.
Houston Texas |
Dr. Isaac is best cardiologist in Houston Texas plain and simple. Although his wait times can take some patience, I assure you that no one will give you higher quality care and love that Dr. Isaac will provide for you. He takes care of not only me, but my entire family. When choosing a cardiologist, I advise you go with Dr. Isaac.
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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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 board certification on record with Healthgrades
  •  No malpractice claims found
  •  No sanctions found
  •  No board actions found

Background Check

  • 0
    Malpractice Claims

    No malpractice history found for Texas.

    What is medical malpractice
  • 0

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

    What is a sanction or disciplinary action
  • 0
    Board Actions

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

    What are board actions

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


  • Medical School
    University Of Texas Southwestern Medical Center At Dallas

    Graduated in 1994

  • Internship Hospital
    Johns Hopkins Hospital

    Completed in 1995

  • Residency Hospital
    Johns Hopkins Hospital

    Completed in 1997

  • Fellowship Hospital
    Baylor College Of Med

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 free profile.


  • Cardiology
  • Interventional Cardiology

Procedures Performed

  • 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