Michael James Brennan, DO, MPH

Primary specialty

Critical Care Medicine (Internal Medicine) PhysicianTaxonomy code 207RC0200X

License

036.164300 Issued in IL

Practice address

1620 W Harrison St
Chicago, IL 60612-3801

Phone

(312) 942-5000

NPI assigned

Apr 15, 2019

Last updated

Sep 24, 2025By the provider in NPPES

Sex

Male

Sole proprietor

No

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

Specialties & licenses 4

Addresses

Electronic endpoints 3

Medicare fee-for-service enrollment

Enrolled in MN, IA, IL3 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 3

Specialty

Critical Care (Intensivists)

Education

Lake Erie Col of Osteopathic Medicine, Bradenton, 2019

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Riverside Emergency Physicians LLCGroup PAC ID 6204294119, 35 clinicians

Advocate Health and Hospitals CorporationGroup PAC ID 7810800935, 3,081 clinicians

Rush University Medical GroupGroup PAC ID 5496658874, 1,521 clinicians

Rush Oak Park ER Physicians GroupGroup PAC ID 8820190606, 29 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Advocate Hospice Hospice, Oak Brook, IL, CCN 141516
• Advocate Christ Hospital & Medical Center Hospital, Oak Lawn, IL, CCN 140208
• Advocate Trinity Hospital Hospital, Chicago, IL, CCN 140048
• Rush Oak Park Hospital Hospital, Oak Park, IL, CCN 140063

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mbrennan249049@uihcdirect.org
• Direct secure messaging: mbrennan432158@direct.myadvocateaurora.org
• Direct secure messaging: mbrennan944704@direct.unitypoint.org
• Direct secure messaging: mbrennan957650@direct.beaumont.edu

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

• Advocate Health and Hospitals Corporation

  dba Advocate Medical Group

  • Multi-Specialty Clinic/Center
  • Oak Brook, IL
  • NPI 1700824455
  Medicare reassignment Care Compare group NPD
• Riverside Emergency Physicians, LLC

  • Emergency Medicine Physician
  • Kankakee, IL
  • NPI 1548969181
  Medicare reassignment Care Compare group NPD
• Rush Oak Park ER Physicians Group

  • Emergency Medical Services (Emergency Medicine) Physician
  • Oak Park, IL
  • NPI 1447260880
  Medicare reassignment Care Compare group NPD
• Rush University Medical Group

  dba Rush University Internists

  • Internal Medicine Physician
  • Chicago, IL
  • NPI 1093819542

  Emergency Medicine

  Medicare reassignment Care Compare group NPD (past)
• Cepamerica Illinois LLP

  • Emergency Medicine Physician
  • Elgin, IL
  • NPI 1912283110
  Medicare reassignment NPD
• CGH Medical Center

  • General Acute Care Hospital
  • Sterling, IL
  • NPI 1902854623
  Medicare reassignment NPD
• St Anthony Emergency Services Physician Group

  • Emergency Medical Services (Emergency Medicine) Physician
  • Chicago, IL
  • NPI 1760587703
  Medicare reassignment NPD
• Cedar Falls Emergency Physicians, LLC

  • Emergency Medicine Physician
  • Cedar Falls, IA
  • NPI 1255146155
  Medicare reassignment NPD
• Lifecare Medical Center

  • Critical Access Hospital
  • Roseau, MN
  • NPI 1609861095
  Medicare reassignment NPD
• Sartori Memorial Hospital Inc

  dba MercyOne Cedar Falls Medical Center

  • Emergency Medicine Physician
  • Cedar Falls, IA
  • NPI 1710928734
  Medicare reassignment NPD
• Rush Medical Group

  dba Rush Orthopaedics

  • Internal Medicine Physician
  • Chicago, IL
  • NPI 1467312850
  Medicare reassignment
• Advocate Health & Hospitals Corp.

  dba Bethany Hospital

  • Emergency Medicine Physician
  • Chicago, IL
  • NPI 1750315545
  NPD

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

• Advocate Health and Hospitals Corporation

  dba Advocate South Suburban Hospital

  • General Acute Care Hospital
  • Hazel Crest, IL
  • NPI 1467560128
  Care Compare affiliation
• Advocate Health and Hospitals Corporation

  dba Advocate Children's Hospital

  • Children's Hospital
  • Oak Lawn, IL
  • NPI 1508315516
  Care Compare affiliation
• Advocate Health and Hospitals Corporation

  dba Advocate Christ Medical Center

  • General Acute Care Hospital
  • Oak Lawn, IL
  • NPI 1548375082
  Care Compare affiliation
• Advocate Health and Hospitals Corporation

  dba Advocate South Suburban Hospital

  • General Acute Care Hospital
  • Chicago, IL
  • NPI 1558479212
  Care Compare affiliation
• Meridian Hospice

  dba Advocate Hospice

  • Community Based Hospice Care Agency
  • Oak Brook, IL
  • NPI 1184691651
  Care Compare affiliation
• Rush Oak Park Hospital Inc

  • General Acute Care Hospital
  • Oak Park, IL
  • NPI 1558391706
  Care Compare affiliation

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

{
    "created_epoch": "1555286400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758672000000",
    "number": "1811550981",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "29373 NETWORK PL",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606731293",
            "telephone_number": "847-390-5900"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1620 W HARRISON ST",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606123801",
            "telephone_number": "312-942-5000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "10000 Telegraph Rd",
            "address_purpose": "LOCATION",
            "city": "Taylor",
            "state": "MI",
            "postal_code": "481803330",
            "country_code": "US",
            "telephone_number": "313-295-5000",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "4440 W 95th St",
            "address_purpose": "LOCATION",
            "city": "Oak Lawn",
            "state": "IL",
            "postal_code": "604532600",
            "country_code": "US",
            "telephone_number": "708-283-5500",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "468 Cadieux Rd",
            "address_purpose": "LOCATION",
            "city": "Grosse Pointe",
            "state": "MI",
            "postal_code": "482301507",
            "country_code": "US",
            "telephone_number": "313-473-1000",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "33155 Annapolis St",
            "address_purpose": "LOCATION",
            "city": "Wayne",
            "state": "MI",
            "postal_code": "481842405",
            "country_code": "US",
            "telephone_number": "734-467-4000",
            "fax_number": "734-467-4017",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BRENNAN",
        "first_name": "MICHAEL",
        "middle_name": "JAMES",
        "name_prefix": "Dr.",
        "credential": "DO, MPH",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-04-15",
        "last_updated": "2025-09-24",
        "certification_date": "2025-09-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "MI",
            "license": "5101025918",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "IL",
            "license": "036.164300",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "MI",
            "license": "5151013942",
            "primary": false
        },
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "IL",
            "license": "036.164300",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://EpicFHIR.aurora.org/FHIR/MYAURORA/api/FHIR/DSTU2/",
            "affiliation": "N",
            "address_1": "4440 W 95th St",
            "city": "Oak Lawn",
            "state": "IL",
            "country_code": "US",
            "postal_code": "604532600",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "mbrennan432158@direct.myadvocateaurora.org",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "4440 W 95th St",
            "city": "Oak Lawn",
            "state": "IL",
            "country_code": "US",
            "postal_code": "604532600",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "MBRENNAN957650@DIRECT.BEAUMONT.EDU",
            "affiliation": "N",
            "address_1": "10000 Telegraph Rd",
            "city": "Taylor",
            "state": "MI",
            "country_code": "US",
            "postal_code": "481803330",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Katherine Brennan
• Kathleen R Brennan, LCPC
• Lisa Brennan
• Maureen Beifuss Brennan
• Megan Kelly Brennan, LCPC
• Neil Patrick Brennan, APRN
• Nicole Brennan
• Nora E Brennan, LCSW
• Rachel Brennan, LCPC
• Riley Brennan

• Critical Care Medicine (Internal Medicine) Physician in Chicago, IL
• Providers in Chicago, IL by specialty
• Critical Care Medicine (Internal Medicine) Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 24, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.