David R. Onsager
- Medicare services, 2024
- 11
- Medicare patients, 2024
- 23
- Publications
- 27
- Clinical trials
- 1
- Hospital affiliations
- 3
- Practice address
- 2650 Ridge Ave, Evanston, IL 60201
- Practice phone
- Call (847) 570-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find David Onsager's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
David R. Onsager is a cardiothoracic surgeon in Evanston, Illinois
David Onsager practices at Evanston Hospital in Evanston, Illinois, part of Endeavor Health.
David Onsager's NPI, 1396829156, was assigned on October 25, 2006. David Onsager graduated from Rush Medical College of Rush University in 1988. David Onsager holds Illinois license 036093456.
- NPI
- 1396829156NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638242290
- NPI enumeration date
- October 25, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (847) 570-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 64
- Medical school graduation
- 1988
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
David R. Onsager practices at Evanston Hospital in Evanston, Illinois
David Onsager's primary practice is Evanston Hospital, at 2650 Ridge Ave, Evanston, IL 60201 in Cook County. The practice phone is (847) 570-2000.
- Evanston Hospital2650 Ridge Ave, Evanston, IL 60201 · Cook CountyPhone(847) 570-2000
Source: Dmand AI Affiliation Data
David R. Onsager is affiliated with 3 sites of care and 5 medical groups
David Onsager's primary practice is Evanston Hospital in Evanston, Illinois, part of Endeavor Health. David Onsager is also affiliated with University of Chicago Medical Center. The medical group on file is Endeavor Health Medical Group. Dmand AI also links David Onsager to 1 more hospital and 4 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at David R. Onsager's practice
Dmand AI tracks the electronic health record (EHR) system at each site where David Onsager practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Evanston Hospital | Available with a free account |
| +2 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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David R. Onsager is one of 208 cardiothoracic surgeons in Illinois
Thoracic surgery (cardiothoracic vascular surgery) is David Onsager's primary specialty in the NPI Registry, under taxonomy code 208G00000X. David Onsager is licensed in Illinois.
Specialties and state licenses
- Thoracic surgery (cardiothoracic vascular surgery), IllinoisPrimary
Cardiothoracic surgeons near David Onsager
Counts of cardiothoracic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
David R. Onsager billed Medicare for 11 services in 2024
CMS data shows 11 Medicare services from David Onsager across 1 procedure code in 2024, for 23 Medicare patients. Medicare paid $7,024 for them. Every service was in a facility, such as a hospital, rather than an office.
David Onsager's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 152024: 1127%
David Onsager compared with the Illinois median for cardiothoracic surgeons, 2024
- David Onsager
- Illinois median
- Medicare services
- 11vs 16493% below
- Medicare patients
- 23vs 13583% below
Medians across 174 cardiothoracic surgeons in Illinois with Dmand AI profiles that report each measure.
David Onsager's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for David Onsager and other cardiothoracic surgeons in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
David R. Onsager treated 23 Medicare patients in 2024, average age 77
CMS counts 23 Medicare patients who saw David Onsager in 2024. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.80, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts David Onsager's median patient age at 67, with 27% women.
Chronic conditions among David Onsager's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease75%
- Atrial fibrillation65%
- Diabetes61%
- Heart failure61%
- Arthritis52%
- Chronic kidney disease48%
Share of Medicare patients with each condition. A patient can have several.
David Onsager's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women27%
- Men73%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How David R. Onsager takes part in Medicare
David Onsager accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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David R. Onsager has 27 publications on record
Dmand AI links 27 papers to David Onsager, published from 2014 to 2024. 2022 was the busiest year, with 5. The most frequent topics are Heart-Assist Devices, Heart Failure and Heart Transplantation. David Onsager has published most often in Ann Thorac Surg. David Onsager's most frequent co-authors are Valluvan Jeevanandam, Tae H. Song and Takeyoshi Ota.
David Onsager's papers by year, 2015 to 2024
Topics David Onsager writes about most
- Heart-Assist Devices
- Heart Failure
- Heart Transplantation
- Postoperative Complications
- Counterpulsation
- Feasibility Studies
- Intra-Aortic Balloon Pumping
- Ambulatory Care
David Onsager's most frequent co-authors
Recent publications by David Onsager
J Cardiothorac Surg
Ann Thorac Surg Short Rep
See who David Onsager researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who David Onsager works with, so you can find a warm path to the right cardiothoracic surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
David R. Onsager has worked on 1 clinical trial
Dmand AI links David Onsager to 1 clinical trial. Conditions studied include Atrial Fibrillation and Arrhythmias, Cardiac.
Conditions in David Onsager's trials
- Atrial Fibrillation
- Arrhythmias, Cardiac
Investigators on the most trials with David Onsager
Recent clinical trials with David Onsager
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
David R. Onsager received $4,852 in industry payments from 2016 to 2025
CMS Open Payments shows 55 general payments to David Onsager from 10 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 56% of the total. TransMedics, Inc. paid the most, $2,529. It also lists 5 research payments totaling $898 in 2019.
General payments to David Onsager by program year, 2016 to 2025
General payments to David Onsager by kind, 2016 to 2025
- Travel and lodging$2,70156%
- Food and beverage$2,12344%
- Gifts$271%
Companies that paid David Onsager the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
David R. Onsager graduated from Rush Medical College of Rush University
David Onsager graduated from Rush Medical College of Rush University in 1988.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for David R. Onsager's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about David R. Onsager
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is David R. Onsager's NPI number?
David R. Onsager's NPI number is 1396829156. It was assigned on October 25, 2006, and it is active in the NPI Registry.
What does David R. Onsager specialize in?
David R. Onsager is a cardiothoracic surgeon in Evanston, Illinois. The primary specialty in the NPI Registry is Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (taxonomy code 208G00000X).
Where does David R. Onsager practice?
David Onsager practices at 2650 Ridge Ave, Evanston, IL 60201. David Onsager's primary practice is Evanston Hospital in Evanston, Illinois, part of Endeavor Health. Dmand AI also links David Onsager to 1 hospital and 4 medical groups.
What is David R. Onsager's office phone number?
The practice phone on file for David Onsager is (847) 570-2000.
What is David R. Onsager's medical license number?
David Onsager holds Illinois license 036093456.
Which hospitals is David R. Onsager affiliated with?
David Onsager practices at Evanston Hospital in Evanston, Illinois. David Onsager is also affiliated with University of Chicago Medical Center. Dmand AI links David Onsager to 1 more hospital.
What medical group is David R. Onsager part of?
David Onsager is linked to Endeavor Health Medical Group. Dmand AI links David Onsager to 4 more medical groups.
Does David R. Onsager accept Medicare?
Yes. CMS data shows David Onsager billed Medicare for 11 services in 2024, and David Onsager accepts Medicare assignment.
How many Medicare patients does David R. Onsager see?
CMS counts 23 Medicare patients who saw David Onsager in 2024, with an average age of 77.
What services does David R. Onsager bill to Medicare?
In 2024, David Onsager's most billed Medicare services were surgery: heart and blood vessels (33533).
Show 5 more questionsShow fewer questions
Where did David R. Onsager go to medical school?
David Onsager graduated from Rush Medical College of Rush University in 1988.
Has David R. Onsager received payments from drug or device companies?
CMS Open Payments shows $4,852 in general payments to David Onsager from 10 companies from 2016 to 2025. The largest total came from TransMedics, Inc.
How long has David R. Onsager been practicing?
David Onsager graduated from medical school in 1988, 38 years ago.
Does David R. Onsager do research?
Dmand AI links 27 publications to David Onsager, published from 2014 to 2024. David Onsager has worked on 1 clinical trial.
Who does David R. Onsager publish with?
David Onsager's most frequent co-authors are Valluvan Jeevanandam (24 shared papers), Tae H. Song (20 shared papers) and Takeyoshi Ota (19 shared papers).
Selling to thoracic surgery (cardiothoracic vascular surgery) practices?
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