Dr. Padraig O'Neill, MD

Dr. Padraig O'Neill, MD

Clinical Cardiac Electrophysiology  |  
Male  |  
65 y/o

Accepting new patients

Dr. Padraig O'Neill, MD is a clinical cardiac electrophysiology doctor who practices in Sacramento, CA. He is 65 years old and has been practicing for 38 years. Dr. O'Neill is affiliated with Mercy General Hospital.

Mercy Medical Group

3941 J St Ste 350

Sacramento, CA 95819
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Accepted insurance

  • Aetna
  • Anthem Blue Cross
  • Blue Shield of California
  • ChoiceCare Network
  • Cigna
  • Coventry Health Care
  • Health Net
  • HealthSmart - Interplan Health Group
  • MultiPlan
  • Networks By Design
  • Pacific Foundation for Medical Care
  • Tricare
  • UnitedHealthCare
  • Western Health Advantage

Learn about Dr. O'Neill

Care Philosophy

The right treatment at the right time.
...Read More


Dr. O'Neill's Experience

Dr. O'Neill's experience matches your search based on the following criteria:
  • Based on total number of patients treated over the last 12 months
  • Specializes in Clinical Cardiac Electrophysiology
  • Board certified in Cardiovascular Disease, Clinical Cardiac Electrophysiology and Internal Medicine
  • No malpractice claims found
  • No sanctions found
  • No board actions found


  • Clinical Cardiac Electrophysiology

Board Certifications

  • Cardiovascular Disease
    Accredited by: American Board of Internal Medicine*
  • Clinical Cardiac Electrophysiology
    Accredited by: American Board of Internal Medicine*
  • Internal Medicine
    Accredited by: American Board of Internal Medicine*

Conditions Treated

  • Abnormal Heart Beat
  • Aneurysm
  • Angina and Acute Coronary Syndrome
  • Aortic Aneurysm
  • Aortic Ectasia
  • Aortic Stenosis
  • Aortic Valve Disease
  • Aortic Valve Regurgitation
  • Arrhythmias
  • Atrial Fibrillation
  • Atrial Flutter
  • Autonomic Disorders
  • Benign Tumor
  • 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 Palpitations
  • Hyperlipidemia
  • Hypertension
  • Hypertensive Chronic Kidney Disease
  • Hypertensive Heart Disease
  • Hypertensive Heart and Chronic Kidney Disease
  • Hypotension
  • Limb Swelling Caused by Fluid Overload
  • Mitral Valve Disease
  • Mitral Valve Regurgitation
  • Pericardial Disease
  • Primary Pulmonary Hypertension
  • Pulmonary Disease
  • Pulmonary Edema
  • Pulmonary Hypertension
  • Pulmonary Valve Disease
  • Rheumatic Aortic Valve Disorders
  • Septal Defect
  • Syncope
  • Thrombosis
  • Tricuspid Valve Disease
  • Vascular Disease


Read More


  • Ablation
  • Ablation for Treatment of Atrial Fibrillation
  • Ablation for Treatment of Cardiac Arrhythmias
  • 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
  • Electrophysiological Study
  • Electrophysiology
  • Heart Surgery
  • Impella Device
  • Insertion of Epicardial Lead for Pacemaker or Cardioverter and-or Defibrillator
  • Insertion of Left Ventricular Lead for Pacemaker or Cardioverter and-or Defibrillator
  • Pacemaker Insertion or Replacement
  • Peripheral Artery Catheterization
  • Removal or Revision of Pacemaker or Cardioverter and-or Defibrillator
  • Thoracentesis
  • Thrombolysis
  • Tilt Testing or Cardiac Event Monitors
  • Vascular Surgical Procedure

Background Check

0 Malpractice Claims

No malpractice history found for California.

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 College Dublin, National University Of Ireland, School Of Medicine And Medical Science
    Medical School | Graduated 1979
  • University College Hospital
    Internship Hospital | Completed 1982
  • Mater Misericordia Hospital
    Residency Hospital | Completed 1982
  • Our Ladys Hospital Sick Chldn
    Residency Hospital | Completed
  • Reg Hospital
    Residency Hospital | Completed 1982
  • Baylor University
    Fellowship Hospital | Completed 1987

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. O'Neill has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

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

Dr. O'Neill's Reviews

Likelihood of recommending Dr. O'Neill to family and friends
based on 19 total reviews (8 with comments)
Dr. O'Neill's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    10 to 15 minutes
Patient Comments (8)
in Orangevale |
Dr. O'Neill screwed up my ablation surgery, which caused me to have to have a second surgery. In performing the surgery, Dr. O'Neill made a mistake and punctured the artery in my left leg, so he had to go through the right leg. However, he didn't properly address the puncture in my left leg, so I had internal bleeding for two days and had to have another surgery to fix his mistake. And that second surgery; I had to pay a large deductible because Dr. O'Neill didn't document it as an emergency.
in Plumas Lake, CA |
I would highly recommend Dr. O'neill. He is personable and explained the procedure I was to have. A no nonsense doctor who is very efficient and easy to talk to.
in Sacramento, CA |
Dr. O'Neill attempted unnecessary ablations which could have resulted in much bigger problems and he and his staff work hard to sell this procedure, which seems odd for a medical practice. Steer clear or get a second opinion before agreeing to any surgeries. Luckily we found a better more caring cardiologist and probably saved a life by going elsewhere. Regional Cardiology Associates runs more like a for-profit corporation than a medical office.
in Auburn, CA |
I have been a patient of Dr. O'Neil's for over 15 years. He has performed many procedures including implantation of an ICD with care and maintence on it and medication. He can seem a little gruff but I like that about him. He has always treated me with straightforward explanations of a very difficult and complex condition that I have. I trust him completely and love his PA Ellie Vierra too. She understands the anxiety and emotions involved with patients. Office staff is great too.
in Galt ca |
We found Dr. O'Neill to be an awesome Cardiologist. We had rather have an A+ rated Dr. than to have a fair Dr. with a wonderful bedside manner. We found both of these things in Dr. O'Neill . He was great in explaining the procedure, , and couldn't have had a better outcome after the surgery. For those of you who complained about his bedside manner; you may want to think about everything that's going through this Dr.s mind about how he's going to repair your ailing heart, and explaing at the same
in Elk Grove, CA |
My husband and I were very concerned about him having a cardiac ablation done. Having met Dr. O'Neill, he was able to explain everything we needed to know, and found him to be very knowledgeable and thorough . We were extremely pleased with his demeaner and compitancy. We found him like able , yet sincere. Heart surgery is no joke. Ablation completed last week, and husband is doing great! Thank You Dr O'Neill ! Sandra and David Brecht
in Sacramento, CA |
Most specialists have zero bedside manner but Dr O'Neill was hostile at both appointments. I felt on the defensive from the moment he began speaking. The person who accompanied me agreed. At followup appointment it was apparent the Doctor had not reviewed either my test results nor the reason for the appointment (medical issue) prior to entering the exam room. Did not provide any specific information only to say there was nothing significant with the results. - but the the issues detected.
Quincy, CA |
I was referred to Dr. O'Neill 6 weeks ago for a consultation for an ablation. I found him to be informative and spent as much time as necessary to explain the procedure which I had done several days ago. All I can say is that the procedure went smoothly and the outcome is very positive. There is a 3 month healing time for scar tissue to form where the heart cells were ablated.....Be patient. The first three days are very critical....Follow the instructions you will be given.
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Now Accepting New Patients
Dr. O'Neill accepts 14 insurance carriers
  • Aetna
  • Anthem Blue Cross
  • Blue Shield of California
  • ChoiceCare Network
  • Cigna
  • Coventry Health Care
  • Health Net
  • HealthSmart - Interplan Health Group
    Interplan Health Group
  • MultiPlan
  • Networks By Design
  • Pacific Foundation for Medical Care
  • Tricare
  • UnitedHealthCare
    United Healthcare
  • Western Health Advantage

*Please verify this information when scheduling an appointment.

Hospitals where Dr. O'Neill has admitting privileges

Mercy General Hospital
4001 J St
Sacramento, CA 95819
View Hospital Profile

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