David R Onsager, - Medicare Cardiac Surgery in Chicago, IL

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David R Onsager, is a medicare enrolled "Thoracic Surgery (cardiothoracic Vascular Surgery)" physician in Chicago, Illinois. He went to Rush Medical College Of Rush University and graduated in 1988 and has 37 years of diverse experience with area of expertise as Cardiac Surgery. He is a member of the group practice Endeavor Health Medical Group, The University Of Chicago and his current practice location is 5841 S Maryland Ave, Chicago, Illinois. You can reach out to his office (for appointments etc.) via phone at (888) 824-0200.

David R Onsager is licensed to practice in Illinois (license number 036093456) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1396829156.

Contact Information

David R Onsager,
5841 S Maryland Ave,
Chicago, IL 60637-1443
(888) 824-0200
Not Available

Map and Direction




Physician's Profile

Full NameDavid R Onsager
GenderMale
SpecialityCardiac Surgery
Experience37 Years
Location5841 S Maryland Ave, Chicago, Illinois
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • David R Onsager attended and graduated from Rush Medical College Of Rush University in 1988
  NPI Data:
  • NPI Number: 1396829156
  • Provider Enumeration Date: 10/25/2006
  • Last Update Date: 10/24/2022
  Medicare PECOS Information:
  • PECOS PAC ID: 9638242290
  • Enrollment ID: I20080716000178

Medical Identifiers

Medical identifiers for David R Onsager such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1396829156NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
208G00000XThoracic Surgery (cardiothoracic Vascular Surgery) 036093456 (Illinois)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
The University Of Chicago Medical CenterChicago, ILHospital
Adventist Hinsdale HospitalHinsdale, ILHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Endeavor Health Medical Group21633346993022
The University Of Chicago77198994261421

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. David R Onsager allows following entities to bill medicare on his behalf.
Entity NameUniversity Of Chicago
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1821048786
PECOS PAC ID: 7719899426
Enrollment ID: O20031103000094
Entity NameThe University Of Chicago Medical Center
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1033218128
PECOS PAC ID: 7618880766
Enrollment ID: O20031106000203
Entity NameEndeavor Health Medical Group
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1497701882
PECOS PAC ID: 2163334699
Enrollment ID: O20040524000118
Entity NameAdventist Health Partners Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1912218850
PECOS PAC ID: 7517154347
Enrollment ID: O20101207000017

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. David R Onsager is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
David R Onsager,
150 Harvester Dr, Suite 300,
Burr Ridge, IL 60527-5919

Ph: () -		David R Onsager,
5841 S Maryland Ave,
Chicago, IL 60637-1443

Ph: (888) 824-0200

Reviews and Comments


Thoracic Surgery (Cardiothoracic Vascular Surgery) Doctors in Chicago, IL

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Prof. Cemil Selim Isbir, MD
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Dr. Marshall David Goldin, MD
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Dr. Michael C Monge, M.D.
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Practice Location: 225 E Chicago Ave, Chicago, IL 60611
Phone: 312-227-4240    Fax: 312-227-9643
Miss Keiko Okumura, M.D.
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Medicare: Not Enrolled in Medicare
Practice Location: 1635 West Congress Parkway, Chicago, IL 60612
Phone: 312-943-6370    Fax: 312-943-6052
Hidefumi Nishida,
Thoracic Surgery (Cardiothoracic Vascular Surgery)
Medicare: Not Enrolled in Medicare
Practice Location: 5841 S Maryland Ave, Chicago, IL 60637
Phone: 888-824-0200    
Maria Lucia L Madariaga,
Thoracic Surgery (Cardiothoracic Vascular Surgery)
Medicare: Accepting Medicare Assignments
Practice Location: 5841 S Maryland Ave, Chicago, IL 60637
Phone: 888-824-0200    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

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