Nathan D Ontrop, M.D.

Primary specialty

Psychiatry PhysicianTaxonomy code 2084P0800X

License

036133952 Issued in IL

Practice address

25 E Washington St Ste 1601
Chicago, IL 60602

Phone

(312) 725-2347

Fax

(312) 577-1574

NPI assigned

Jun 22, 2011

Last updated

Aug 7, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 2

Addresses

Electronic endpoints 4

Medicare fee-for-service enrollment

Enrolled in IL

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 1

Specialty

Psychiatry

Education

Loyola University of Chicago, Stritch School of Medicine, 2011

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Osf Multi-Specialty GroupGroup PAC ID 3678889789, 2,123 clinicians

Ottawa Regional Hospital and Healthcare CenterGroup PAC ID 9133029861, 47 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Osf Saint Elizabeth MDL Ctr Hospital, Peru, IL, CCN 140110

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: nontrop277443@direct.myadvocateaurora.org
• Direct secure messaging: nontropmd323009@carlehiedirect.net

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.

• Osf Multi-Specialty Group

  • Internal Medicine Physician
  • Peoria, IL
  • NPI 1922445527
  Medicare reassignment Care Compare group NPD
• Ottawa Regional Hospital & Healthcare Center

  dba OSF Saint Elizabeth Medical Center

  • General Acute Care Hospital
  • Ottawa, IL
  • NPI 1306971080

  Psychiatry

  Medicare reassignment Care Compare group NPD
• Nathan Ontrop MD SC

  • Psychiatry Physician
  • Chicago, IL
  • NPI 1619498052
  Medicare reassignment Authorized official
• Advocate Health and Hospitals Corporation

  dba Advocate Medical Group

  • Multi-Specialty Clinic/Center
  • Oak Brook, IL
  • NPI 1700824455
  Medicare reassignment NPD
• Carle West Physician Group Inc

  • Family Medicine Physician
  • Normal, IL
  • NPI 1467074138
  Medicare reassignment NPD
• Advocate Health & Hospitals Corporation

  dba Advocate Christ Medical Group

  • Medical Specialty Clinic/Center
  • Oak Lawn, IL
  • NPI 1912936014
  NPD
• Advocate Health and Hospitals Corporation

  dba Advocate Children's Hospital

  • Children's Hospital
  • Oak Lawn, IL
  • NPI 1508315516
  NPD
• Ottawa Regional Hospital & Healthcare Center

  dba OSF Healthcare - Medical Group (Non-RHC Billing)

  • Family Medicine Physician
  • Marseilles, IL
  • NPI 1558088203
  NPD
• Central PA Pharmacy LLC.

  dba patton pharmacy and v&s variety

  • Community/Retail Pharmacy
  • Patton, PA
  • NPI 1578541413
  NPD

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

• Ottawa Regional Hospital & Healthcare Center

  dba OSF Saint Elizabeth Medical Center

  • General Acute Care Hospital
  • Peru, IL
  • NPI 1588713440
  Care Compare affiliation

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

{
    "created_epoch": "1308700800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1754524800000",
    "number": "1760778468",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "25 E WASHINGTON ST STE 1601",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606021882",
            "telephone_number": "312-725-2347",
            "fax_number": "312-577-1574"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "25 E WASHINGTON ST STE 1601",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "60602",
            "telephone_number": "312-725-2347",
            "fax_number": "312-577-1574"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "836 W Wellington Ave",
            "address_purpose": "LOCATION",
            "city": "Chicago",
            "state": "IL",
            "postal_code": "606575147",
            "country_code": "US",
            "telephone_number": "773-296-3220",
            "fax_number": "773-296-3226",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ONTROP",
        "first_name": "NATHAN",
        "middle_name": "D",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2011-06-22",
        "last_updated": "2025-08-07",
        "certification_date": "2025-08-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2084P0800X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Psychiatry",
            "state": "IL",
            "license": "125059575",
            "primary": false
        },
        {
            "code": "2084P0800X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Psychiatry",
            "state": "IL",
            "license": "036133952",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "nontrop277443@direct.myadvocateaurora.org",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "25 E Washington St Ste 1601",
            "city": "Chicago",
            "state": "IL",
            "country_code": "US",
            "postal_code": "60602",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://EpicFHIR.aurora.org/FHIR/MYAURORA/api/FHIR/DSTU2/",
            "affiliation": "N",
            "address_1": "25 E Washington St Ste 1601",
            "city": "Chicago",
            "state": "IL",
            "country_code": "US",
            "postal_code": "60602",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "nontrop277443@direct.myadvocateaurora.org",
            "affiliation": "N",
            "address_1": "836 W Wellington Ave",
            "city": "Chicago",
            "state": "IL",
            "country_code": "US",
            "postal_code": "606575147",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://EpicFHIR.aurora.org/FHIR/MYAURORA/api/FHIR/DSTU2/",
            "affiliation": "N",
            "address_1": "836 W Wellington Ave",
            "city": "Chicago",
            "state": "IL",
            "country_code": "US",
            "postal_code": "606575147",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

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• Psychiatry Physician in Chicago, IL
• Providers in Chicago, IL by specialty
• Psychiatry Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 7, 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.