Individual provider Active NPI

Christopher Greb, MD

  • Allergy & Immunology (Internal Medicine) Physician
  • Chicago, IL
National Provider Identifier
1134623895
Registry record updated Jun 26, 2023
On this page

Key facts

NPPES NPI Registry
Primary specialty
Allergy & Immunology (Internal Medicine) PhysicianTaxonomy code 207RA0201X
License
036165118 Issued in IL
Practice address
1725 W Harrison Street Ste 970
Chicago, IL 60612-3828
Phone
(312) 942-6979
NPI assigned
Mar 19, 2018
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jun 26, 2023

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

Specialties & licenses 3

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 125.075689 IL
Student in an Organized Health Care Education/Training Program 390200000X
Allergy & Immunology (Internal Medicine) Physician 207RA0201X 036165118 IL Primary

Addresses

Primary practice location

1725 W Harrison Street Ste 970
Chicago, IL 60612-3828

Mailing address

1725 W Harrison Street Ste 970
Chicago, IL 60612-3828

Other practice location 1

2160 S 1st Ave
Maywood, IL 60153-3328
Phone (888) 584-7888

Other practice location 2

500 S Preston St Rm 305
Louisville, KY 40202-1702
Phone (502) 852-8696

Medicare participation

Medicare enrollment files
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

Enrollment IDStateProvider typePAC IDDetails
I20250905003609 IL Practitioner - Allergy/ImmunologyPractitioner - Internal Medicine 3375953011 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Allergy/ImmunologyAlso: Internal Medicine
Education
University of Louisville School of Medicine, 2020
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Rush University Medical GroupGroup PAC ID 5496658874, 1,521 clinicians

Practice addresses (Care Compare)

1625 N Harlem Ave
Chicago, IL 60707-4303
Phone (708) 312-0360

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
125.075689ILMDInternal Medicine Physician
036165118ILMDAllergy & Immunology (Internal Medicine) Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Rush University Medical Group Internal Medicine CurrentSince Aug 26, 2025 Accepting new patients
Rush University Medical Center Internal Medicine CurrentSince Aug 26, 2025 Accepting new patients
Loyola University Medical Center Current Accepting new patients

Locations

1700 W Van Buren St
#500
Chicago, IL 60612
Phone (312) 563-2875

1700 W Van Buren St
Ste 161
Chicago, IL 60612
Phone (312) 563-4134

1725 W Harrison St
Ste 970
Chicago, IL 60612
Phone (312) 563-3447

1625 N Harlem Ave
Chicago, IL 60707
Phone (312) 256-8583

75 Remittance Dr
Dept 1611
Chicago, IL 60675

1725 W Harrison St
Ste 10
Chicago, IL 60612
Phone (312) 563-3700

1725 W Harrison St
Ste 117
Chicago, IL 60612
Phone (312) 942-6292

2160 S 1st Ave
Maywood, IL 60153
Phone (708) 216-4400

Interoperability endpoints

  • Direct secure messaging: cgreb125853@direct.luhs.org

Organizations & group practices 3

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 3

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": "1521417600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1687737600000",
    "number": "1134623895",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1725 W HARRISON STREET STE 970",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606123828"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1725 W HARRISON STREET STE 970",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606123828",
            "telephone_number": "312-942-6979"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2160 S 1st Ave",
            "address_purpose": "LOCATION",
            "city": "Maywood",
            "state": "IL",
            "postal_code": "601533328",
            "country_code": "US",
            "telephone_number": "888-584-7888",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "500 S Preston St Rm 305",
            "address_purpose": "LOCATION",
            "city": "Louisville",
            "state": "KY",
            "postal_code": "402021702",
            "country_code": "US",
            "telephone_number": "502-852-8696",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "GREB",
        "first_name": "CHRISTOPHER",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-03-19",
        "last_updated": "2023-06-26",
        "certification_date": "2023-06-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "125.075689",
            "primary": false
        },
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "207RA0201X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Allergy & Immunology",
            "state": "IL",
            "license": "036165118",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Chicago, IL

Sources for this page

Verify at the official NPI Registry.