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Dr. David Onsager, MD

Thoracic Surgeon

Evanston, IL

31 Years of Experience

Accepting patients

Affiliated with a Castle Connolly Top Hospital

    Who is Dr. Onsager, Thoracic Surgeon in Evanston, IL?

    Dr. David Onsager, MD is a Thoracic Surgeon, who primarily practices in Evanston, IL with 2 additional practice locations. He has been practicing for over 31 years and is board certified. Dr. Onsager graduated from Rush Medical College of Rush University Medical Center and completed his residency at Univ Of Wi Hosp & Cli, Thoracic Surgery; Med Coll Wi Affil Hosps, General Surgery. Dr. Onsager is fluent in English, and is currently seeing new patients. Dr. Onsager’s practice accepts Medicare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Onsager’s office.

    Where did Dr. Onsager go to medical school and complete their residency?

    • Residency: Univ Of Wi Hosp & Cli, Thoracic Surgery; Med Coll Wi Affil Hosps, General Surgery

    • Medical School: Rush Med Coll of Rush University, Chicago Il | Rush Medical College of Rush University Medical Center

    Is Dr. Onsager board certified as a Thoracic Surgeon?

    Yes, Dr. David Onsager, MD is board certified by the American Board of Surgery , American Board of Thoracic Surgery

    What languages does Dr. Onsager speak?

    Dr. Onsager and their clinical team can communicate with patients in the following languages:

    • English

    What conditions does a Thoracic Surgeon like Dr. Onsager typically treat?

    As a Thoracic Surgeon, Dr. Onsager diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Onsager. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology.

    Also known as:

    • Narrowed Aortic Valve
    • Leaky Mitral Valve
    • Heart Valve Disease
    • Aortic Valve Stenosis
    • Tight Aortic Valve
    • Mitral Valve Insufficiency
    • Mitral Regurgitation

    ICD-10 Codes:

    • I350: Nonrheumatic aortic (valve) stenosis
    • I340: Nonrheumatic mitral (valve) insufficiency

    Also known as:

    • Hardening of the Arteries in the Heart without Chest Pain
    • Unstable Angina
    • Atherosclerosis
    • Coronary Artery Disease
    • Silent Coronary Artery Disease
    • Asymptomatic Atherosclerosis
    • Unstable Chest Pain
    • Acute Coronary Syndrome
    • Atherosclerotic Heart Disease with Unstable Angina

    ICD-10 Codes:

    • I2510: Atherosclerotic heart disease of native coronary artery without angina pectoris
    • I25110: Atherosclerotic heart disease of native coronary artery with unstable angina pectoris

    Also known as:

    • Circulatory System Surgery Aftercare
    • After Surgery
    • Post-cardiac surgery care
    • Vascular surgery aftercare
    • Heart surgery recovery

    ICD-10 Codes:

    • Z48812: Encounter for surgical aftercare following surgery on the circulatory system

    What procedures does a Thoracic Surgeon like Dr. Onsager typically perform?

    As a Thoracic Surgeon, Dr. Onsager performs a variety of medical procedures. This procedure information is derived from anonymized insurance claims and highlights the medical procedures most commonly performed by Dr. Onsager. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology.

    Also known as:

    • Coronary Artery Bypass Graft (CABG)
    • Coronary Artery Bypass Surgery
    • Heart bypass surgery
    • CABG surgery
    • Arterial bypass graft

    CPT Codes:

    • 33533: Coronary artery bypass, using arterial graft(s); single arterial graft

    Also known as:

    • Endoscopic Vein Harvest for Bypass
    • Endoscopy
    • Video-Assisted Vein Harvest
    • Minimally Invasive Vein Removal
    • Endoscopic Saphenous Vein Harvest
    • Vein Harvesting for CABG

    CPT Codes:

    • 33508: Endoscopy, surgical, including video-assisted harvest of vein(s) for coronary artery bypass procedure (List separately in addition to code for primary procedure)

    Also known as:

    • Coronary Artery Bypass Graft (CABG) with 2 Vein Grafts
    • Coronary Artery Bypass Surgery
    • CABG surgery
    • Heart bypass with vein grafts
    • Coronary revascularization

    CPT Codes:

    • 33518: Coronary artery bypass, using venous graft(s) and arterial graft(s); 2 venous grafts (List separately in addition to code for primary procedure)

    Also known as:

    • Open Aortic Valve Replacement (Prosthetic Valve)
    • Surgical Aortic Valve Replacement
    • Open Heart Aortic Valve Surgery
    • Prosthetic Aortic Valve Implantation

    CPT Codes:

    • 33405: Replacement, aortic valve, open, with cardiopulmonary bypass; with prosthetic valve other than homograft or stentless valve

    Also known as:

    • Triple Bypass Surgery (Additional Grafts)
    • Coronary Artery Bypass Surgery
    • CABG (Coronary Artery Bypass Graft)
    • Heart Bypass Surgery
    • Coronary Revascularization

    CPT Codes:

    • 33519: Coronary artery bypass, using venous graft(s) and arterial graft(s); 3 venous grafts (List separately in addition to code for primary procedure)

    Does Dr. Onsager accept my insurance?

    Dr. Onsager accepts most major insurance plans. Important: Please contact the office before your appointment to verify that your specific plan and network are accepted.

    What insurance plans does Dr. Onsager accept in Evanston, IL?

    Dr. Onsager in Evanston, IL accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.

    Top Insurances

    • Centene Corporation

    • Cigna Group

    • Cook County Health & Hospitals System

    • CVS Health (formerly Aetna)

    • Elevance Health Inc. (formerly Anthem)

    • Federal government of the United States

    • Health Care Service Corporation

    • Medicare

    • State of Illinois

    • UnitedHealth Group

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    Where is Dr. Onsager's office located?

    Dr. David Onsager's Primary Practice

    2650 Ridge Ave Ste 1155

    Evanston, IL 60201

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    Dr. David Onsager's Practice 2

    200 Berteau Ave Elmhurst Hospital

    Elmhurst, IL 60126

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    Dr. David Onsager's Practice 3

    120 N Oak St

    Hinsdale, IL 60521

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    What is Dr. Onsager's NPI number?A National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.

    Dr. Onsager's National Provider Identifier (NPI) number is 1396829156.

    What common questions do patients ask about Dr. Onsager?

    Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Onsager

    What is Dr. David Onsager's specialty?

    Dr. Onsager is a Thoracic Surgeon near Evanston, IL.

    What does a Thoracic Surgeon do?

    A thoracic surgeon is a healthcare expert with specialization in the surgical, perioperative, and critical care of patients with conditions affecting the chest. Their expertise encompasses the surgical treatment of coronary artery disease, lung, esophageal, and chest wall cancers, tracheal abnormalities, and issues with the great vessels and heart valves. They also address congenital anomalies, mediastinal tumors, and diaphragm diseases. Additionally, thoracic surgeons manage airway issues and chest injuries as part of their medical specialty.

    Is Dr. David Onsager affiliated with a ranked Castle Connolly Top Hospital?

    Yes, Dr. Onsager is affiliated with Endeavor Health Evanston Hospital, Uchicago Medicine Ingalls Memorial Hospital, Northwestern Medicine Mchenry Hospital which are a Castle Connolly Top Hospitals. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals

    When to see a Thoracic Surgeon?: Guides for symptoms, conditions, and treatments

    Understand your symptoms and know when it’s time to see a Thoracic Surgeon. Explore insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.

    Is Dr. David Onsager accepting new patients in Evanston, IL?

    Yes, Dr. David Onsager is accepting new patients at this time.

    Does Dr. David Onsager offer online booking?

    Please contact Dr. Onsager's office for information about online booking, telehealth, or to schedule an appointment.

    How can I make an appointment with Dr. David Onsager?

    Please contact Dr. Onsager's office to schedule an appointment.

    Where is Dr. Onsager's office located?

    Dr. Onsager's offices are located in Evanston, IL, Elmhurst, IL, and Hinsdale, IL.

    Which board certifications does Dr. David Onsager have?

    Dr. David Onsager is certified by the American Board of Surgery and American Board of Thoracic Surgery.