Individual provider Active NPI

Gillian Brennan

  • Neonatal-Perinatal Medicine Physician
  • Chicago, IL
National Provider Identifier
1174782437
Registry record updated Oct 24, 2022
On this page

Key facts

NPPES NPI Registry
Primary specialty
Neonatal-Perinatal Medicine PhysicianTaxonomy code 2080N0001X
License
036122278 Issued in IL
Practice address
5841 S Maryland Ave
Chicago, IL 60637-1443
Phone
(888) 824-0200
NPI assigned
Jun 3, 2008
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Oct 24, 2022

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Neonatal-Perinatal Medicine Physician 2080N0001X 036122278 IL Primary

Addresses

Primary practice location

5841 S Maryland Ave
Chicago, IL 60637-1443

Mailing address

150 Harvester Dr
Suite 300
Burr Ridge, IL 60527-5919

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address gbrennanmd121519@uchospital.direct-ci.com University of Chicago Physicians Group

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in IL, GU2 enrollments
Eligible to order & refer
  • Part B services: Yes
  • Medical equipment: Yes
  • Home health: Yes
  • Power mobility devices: Yes
  • Hospice: Yes
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20120824000186 IL Practitioner - Pediatric Medicine 2961659057 Reassigns benefits to 3 organizations
I20251013002859 GU Practitioner - Other (Physician) 2961659057 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Undefined Physician Type (Specify)
Education
Other, 2004
Medicare assignment
May accept Medicare assignment

Practice addresses (Care Compare)

850 Gov Carlos G Camacho Rd
Tamuning, GU 96913

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
036122278ILMDNeonatal-Perinatal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Guam Memorial Hospital CurrentSince Jul 4, 2025 Accepting new patients
Osf Healthcare System CurrentSince Aug 19, 2020 Accepting new patients
Central PA Pharmacy LLC. Current Accepting new patients
Guam Memorial Hospital CurrentSince Jul 4, 2025 Accepting new patients
Osf Healthcare System CurrentSince Aug 19, 2020 Accepting new patients
Osf Multi-Specialty Group CurrentSince Sep 14, 2021 Accepting new patients
University of Chicago CurrentSince Mar 1, 2016 Accepting new patients

Locations

850 Gov Carlos G Camacho Rd
Tamuning, GU 96913
Phone (671) 647-2555

850 Gov Carlos G Camacho Rd
#R
Tamuning, GU 96913
Phone (671) 647-2552

150 Harvester Dr
Ste 300
Burr Ridge, IL 60527
Phone (773) 702-1061

350 N Wall St
Kankakee, IL 60901
Phone (815) 935-7500

1000 W Harlem Ave
Monmouth, IL 61462
Phone (309) 734-1414

120 N Oak St
Oak Brook Mall, IL 60521
Phone (630) 856-6700

8600 State Route 91
Ste 130
Peoria, IL 61615
Phone (309) 683-5050

1420 W Pioneer Pkwy
Peoria, IL 61615
Phone (309) 308-5195

Organizations & group practices 7

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.

NPI Registry JSON

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

{
    "created_epoch": "1212451200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1666569600000",
    "number": "1174782437",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "150 HARVESTER DR",
            "address_2": "SUITE 300",
            "city": "BURR RIDGE",
            "state": "IL",
            "postal_code": "605275919"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5841 S MARYLAND AVE",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606371443",
            "telephone_number": "888-824-0200"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "BRENNAN",
        "first_name": "GILLIAN",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2008-06-03",
        "last_updated": "2022-10-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080N0001X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Neonatal-Perinatal Medicine",
            "state": "IL",
            "license": "036122278",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "gbrennanmd121519@uchospital.direct-ci.com",
            "affiliation": "Y",
            "affiliationName": "University of Chicago Physicians Group",
            "address_1": "5841 S Maryland Ave",
            "city": "Chicago",
            "state": "IL",
            "country_code": "US",
            "postal_code": "606371443",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Chicago, IL

Sources for this page

Verify at the official NPI Registry.