NPIMap

Individual provider Active NPI

Sean Dennis Oconnor, M.D.

  • Internal Medicine Physician
  • Chicago, IL
National Provider Identifier
1609831528
Registry record updated Mar 27, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
03697642 Issued in IL
Practice address
211 E Chicago Ave Ste 1700
Chicago, IL 60611-2672
Phone
(312) 944-6677
Fax
(312) 944-3346
NPI assigned
Apr 20, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Mar 27, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 03697642 IL Primary

Addresses

Primary practice location

211 E Chicago Ave Ste 1700
Chicago, IL 60611-2672

Mailing address

211 E Chicago Ave Ste 1700
Chicago, IL 60611-2672
Phone (312) 944-6677

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in IL
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20101028001354 IL Practitioner - Internal Medicine 8022042142 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
University of Illinois College of Med (CHI/Peor/Rock/CHM-Urb), 1994
Medicare assignment
May accept Medicare assignment

Practice addresses (Care Compare)

211 E Chicago Ave
Suite 1700
Chicago, IL 60611-2672
Phone (312) 944-8979

Hospital & facility affiliations

  • Accentcare Home Health of Illinois Home health agency, Lombard, IL, CCN 147811
  • Meridian Home Health Care Services, Inc Home health agency, Libertyville, IL, CCN 148006
  • Northwestern Memorial Hospital Hospital, Chicago, IL, CCN 140281
  • Northwestern Lake Forest Hospital Hospital, Lake Forest, IL, CCN 140130
  • Northwestern Medicine Central Dupage Hospital Hospital, Winfield, IL, CCN 140242
  • Palos Community Hospital Hospital, Palos Heights, IL, CCN 140062
  • Shirley Ryan Abilitylab Inpatient rehabilitation facility, Chicago, IL, CCN 143026

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
03697642ILMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Sean D Oconnor MD SC Internal Medicine CurrentSince Oct 1, 2014 Accepting new patients
Associates in Internal Medicine, LTD. Internal Medicine Current Accepting new patients

Locations

211 E Chicago Ave
Ste 1700
Chicago, IL 60611
Phone (312) 255-9999

211 E Chicago Ave
Ste 1050
Chicago, IL 60611
Phone (312) 712-9999

Interoperability endpoints

  • FHIR API: https://api.platform.athenahealth.com/3992/brand/1/csg/1/fhir/r4

Organizations & group practices 2

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

Hospital & facility affiliations 9

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1145491200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1774569600000",
    "number": "1609831528",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "211 E CHICAGO AVE STE 1700",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606112672",
            "telephone_number": "312-944-6677",
            "fax_number": "312-944-3346"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "211 E CHICAGO AVE STE 1700",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606112672",
            "telephone_number": "312-944-6677",
            "fax_number": "312-944-3346"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OCONNOR",
        "first_name": "SEAN",
        "middle_name": "DENNIS",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-04-20",
        "last_updated": "2026-03-27",
        "certification_date": "2026-03-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "03697642",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Chicago, IL

Sources for this page

Verify at the official NPI Registry.