Dr. Mark Onaitis, MD

Dr. Mark Onaitis, MD

Thoracic Surgery  ·  
Male  ·  
Age 47
Dr. Mark Onaitis, MD is a thoracic surgery specialist in La Jolla, CA and has been practicing for 17 years. He graduated from Duke University School Of Medicine in 1997 and specializes in thoracic surgery and hematology & oncology.Read his story

3855 Health Sciences Drive

La Jolla, CA 92093

Contact Information

(858) 657-7000

Insurance Accepted

  • Aetna
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of California
  • Cigna
  • First Health (Coventry Health Care)
  • Molina Healthcare
  • MultiPlan

*Please verify this information when scheduling an appointment.

Learn about Dr. Onaitis

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you.

Top Care Areas

See how frequently Dr. Onaitis performs your care needs compared to other doctors.

Esophageal Cancer
very high
more than 92% of peers
Lung Surgery
very high
more than 89% of peers
Video-Assisted Thoracoscopic Surgery (VATS) or Thoracotomy
more than 86% of peers

Dr. Onaitis's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

Dr. Onaitis' bio

This content was provided by Dr. Onaitis "Mark Onaitis, MD, is a board-certified thoracic surgeon who specializes in malignant and benign conditions of the chest, including lung cancer, esophageal cancer, thymic malignancy, gastroesophageal reflux, achalasia, paraesophageal hernia, and myasthenia gravis. He uses minimally invasive approaches – thorascopy and robotics – to treat these conditions.As a professor in the Department of Surgery, Dr. Onaitis trains medical students, residents and fellows at UC San Diego School of Medicine. His basic science research interests include stem and progenitor cells and lung cancer. His clinical research focuses on quality indicators in thoracic surgery.Dr. Onaitis completed a fellowship in thoracic surgery and a residency in general surgery at Duke University School of Medicine, where he served as chief resident. He also earned his medical degree and obtained a master’s degree in clinical research from Duke University School of Medicine. He is board-certified in thoracic surgery.Dr. Onaitis is a member of the American College of Surgeons, the Society of Thoracic Surgeons and the American Association of Thoracic Surgeons. He has published widely and serves as a reviewer for several professional journals.He and his wife have two sons."
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Care Philosophy

This content was provided by Dr. Onaitis "Im a thoracic surgeon who primarily sees lung and esophageal cancer patients but treats benign esophageal patients as well. Ive been at Duke for about 20 years and enjoy working at a place with top-notch clinicians doing cutting-edge work. I became a doctor because I was always interested in math and science and had the privilege of shadowing a physician who lived next door to me. The more experience I had with medicine the more I liked it. I enjoy surgery because I like the process of identifying problems and then fixing them. The best part of my job is helping patients overcome cancer. Many patients I see arrive feeling anxious but are surprised with how well they do and how quickly they can bounce back from surgery. Watching that process unfold continues to be extremely inspiring. Im originally from Pittsburgh but my family is proud to call North Carolina home."
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2  Specialties

  • Thoracic Surgery
  • Hematology & Oncology

1  Board Certifications

  • Thoracic Cardiovascular Surgery
    Accredited by: American Board of Thoracic Surgery*

59  Conditions Treated

  • Acute Leukemia
  • Acute Lymphocytic Leukemia
  • All Lymphoma
  • Anemia
  • Aneurysm
  • Angina and Acute Coronary Syndrome
  • Aortic Aneurysm
  • Aortic Dissection
  • Aortic Embolism and Thrombosis
  • Aortic Valve Disease
  • Arrhythmias
  • Atrial Fibrillation
  • Atrial Flutter
  • Autoimmune Diseases
  • Bleeding Disorders
  • Blood Disorders
  • Bone Cancer
  • Bone Disorders
  • Cancer
  • Cardiomegaly
  • Cardiomyopathy
  • Carotid Artery Disease
  • Coagulation Disorders (incl. Hemophilia)
  • Congenital Heart Defects
  • Coronary Artery Disease (CAD)
  • Deep Vein Thrombosis (DVT)
  • Empyema
  • Esophageal Cancer
  • Esophageal Diseases
  • Head and Neck Cancer
  • Heart Disease
  • Hemophilia
  • Hodgkin's Disease
  • Immune Thrombocytopenic Purpura (ITP)
  • Leukocytosis
  • Lung Cancer
  • Lung Neoplasms, Not Specified as Malignant
  • Mediastinal Tumors, Malignant
  • Mediastinal Tumors, Not Specified as Malignant
  • Mitral Valve Disease
  • Multiple Myeloma
  • Neuroendocrine Tumors
  • Neutropenia
  • Non-Hodgkin's Lymphoma
  • Pericardial Disease
  • Pleura Cancer
  • Pleural Cancer
  • Pleural Neoplasm, Not Specified as Malignant
  • Pulmonary Disease
  • Pulmonary Embolism
  • Pulmonary Valve Disease
  • Purpura
  • Septal Defect
  • Thrombocytosis
  • Thrombosis
  • Thymomas
  • Vascular Disease
  • Venous Embolism and Thrombosis
  • von Willebrand Disease
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40  Procedures

  • Abscess or Cyst Drainage or Aspiration
  • Abscess or Fluid Incision and Drainage
  • Arterial Catheterization With Robotic Assistance
  • Cardiac Electrophysiology
  • Chest CT (incl. Heart and Lungs)
  • Coronary Artery Bypass With Robotic Assistance
  • Decortication and Pleurectomy
  • Diaphragmatic-Paraesophageal Hiatal Hernia Repair With Robotic Assistance
  • Esophageal Surgery
  • Esophagectomy (Esophagogastrostomy, Esophagojejunostomy)
  • Esophagomyotomy
  • Esophagomyotomy With Robotic Assistance
  • Esophagostomy
  • Excision of Esophageal Lesion
  • Head and Neck Surgery
  • Heart Surgery
  • Hernia Repair
  • Laparoscopic Diaphragmatic or Paraesophageal Hernia Repair With Robotic Assistance
  • Laparoscopic Surgical Procedure
  • Lobectomy of Lung With Robotic Assistance
  • Lobectomy, Open
  • Lung Removal (Partial or Complete): Open, or Resection of Lung Tumor: Open
  • Lung Surgery
  • Lymph Node Biopsy or Excision
  • Lymphadenectomy With Robotic Assistance
  • Open Diaphragmatic and-or Paraesophageal Hiatal Hernia Repair
  • Open Thymectomy
  • Paraesophageal Hernia Repair, Laparoscopic
  • Plasmapheresis
  • Port Placements or Replacements
  • Thoracentesis
  • Thoracoscopic Excision of Lung With Robotic Assistance
  • Thoracoscopic Lobectomy
  • Thoracoscopic Lobectomy of Lung With Robotic Assistance
  • Thoracoscopic Pneumonectomy
  • Thoracoscopic Segmentectomy
  • Thoracoscopic Wedge Resection
  • Tracheal Surgery
  • Vascular Surgical Procedure
  • Video-Assisted Thoracoscopic Surgery (VATS) or Thoracotomy
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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.


  • Duke University School Of Medicine
    Medical School | Graduated 1997
  • Duke University Medical Center
    Residency Hospital | Completed 2007
  • Duke University Medical Center
    Fellowship Hospital | Completed 2001

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Onaitis has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

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

Dr. Onaitis' Reviews

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Average Wait Time
  • 16 – 30 minutes
Dr. Onaitis' Performance
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  • Explains condition(s) well
  • Answers questions
  • Time well spent
Office & Staff Performance
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What People Say About Dr. Mark Onaitis, MD
I would highly recommend Dr. Onaitis. He removed a lobe of my right lung that had a malignant growth with the VATS procedure. I was able to leave the hospital after two days and continue recovering in the comfort of my home.
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C. C. in San Diego, CA – Apr 19, 2018
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His kind yet persistent attitude led me to have a nodule removed from my lung even after a biopsy had come back negative. He was correct, it was cancer but luckily it was stage 1A and removed successfully. He saved my life. Though I now live in Texas I will fly back to SD to see him for all...Read More
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Linda Murphy in Grapevine, TX – Feb 14, 2018
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