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Edit this profileAt a glance
- 5841 S Maryland Ave, Chicago, IL 60637
About David Onsager
David R. Onsager is a healthcare provider in Chicago, IL specializing in thoracic surgery (cardiothoracic). David trained at Rush Medical College of Rush University, graduating in 1988. According to Medicare claims data, the services billed most often include coronary artery bypass using artery graft, 1 graft. This provider record is associated with NPI 1396829156.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (888) 824-0200
- Email not available
Practice Locations
5841 S MARYLAND AVE
Chicago, IL 60637
Conditions Commonly Evaluated or Treated
Within Thoracic Surgery generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Airway
Chest tumors
Chest wall
Diaphragm
Esophagus
Esophagus and stomach
- Acid reflux
- Barrett's esophagus
- Esophageal cancer
- Esophageal pouch
- Esophagus tear
- Hiatal hernia
- Swallowing difficulties
Heart lining
Infection
Lung
Lung cancer
Lung conditions
Nerves
Nerves and blood vessels
Neuromuscular
Pleural disease
Sweating disorders
Trauma
Vascular
Procedures & services
Airway
Airway surgery
Chest tumors
Chest wall
Chest wall surgery
- Broken rib plating surgery
- Chest wall reconstruction
- Sunken chest repair
- Thoracic Outlet Decompression
Diagnostic tests
Diagnostics
Diaphragm
Diaphragm surgery
Emphysema
Esophagus
Esophagus surgery
- Acid reflux surgery
- Esophageal dilation
- Esophageal stent placement
- Esophagus removal surgery
- Hiatal hernia surgery
- Peroral endoscopic myotomy
Fluid drainage
Heart lining
Lung surgery
- Collapsed lung surgery
- Lung cancer surgery
- Lung lining scraping and cleaning
- Lung nodule removal
- Lung valve placement for emphysema
- Minimally invasive lung surgery
Nerves
Pleural disease
Robotic surgery
Surgical approach
Sweat surgery
Transplant
Trauma
Procedures Most Often Billed to Medicare
11 services · 11 patients · 1 distinct code
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Coronary artery bypass using artery graft, 1 graft | Procedure | 33533 |
11 | Less often than most peers in Thoracic Surgery (Cardiothoracic) |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other thoracic surgery specialists in Chicago 8
Same specialty, same city.
Trained at Rush Medical College of Rush University 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1988 at Rush Medical College of Rush University 8
Providers who graduated from the same medical school in the same year.
Also performs Coronary artery bypass using artery graft, 1 graft 8
Providers in IL who bill this service to Medicare most often.
Common questions
What kind of doctor is David R. Onsager?
David R. Onsager is a thoracic surgery (cardiothoracic) in Chicago, IL. That is the designation recorded for this NPI in the federal registry.
NPI registry
What is David R. Onsager's address?
David R. Onsager is listed at 5841 S Maryland Ave, Chicago, IL 60637. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with David R. Onsager?
The number on file is (888) 824-0200. Contact the office directly to confirm availability and scheduling.
NPI registry
What is David R. Onsager's NPI number?
David R. Onsager's National Provider Identifier is 1396829156. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did David R. Onsager train?
David R. Onsager attended Rush Medical College of Rush University, graduating in 1988. This comes from the CMS National Downloadable File.
CMS public data
How long has David R. Onsager been practicing?
David R. Onsager has 38 years experience. Calculated from a graduation year of 1988, reported in the CMS National Downloadable File.
CMS public data
What procedures does David R. Onsager perform?
According to Medicare billing data, David R. Onsager performs procedures including coronary artery bypass using artery graft, 1 graft. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has David R. Onsager confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by David R. Onsager. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.