Nathaniel Joseph Leonardi, DO

Primary specialty

Nephrology PhysicianTaxonomy code 207RN0300X

License

036.179518 Issued in IL

Practice address

1725 W Harrison St Ste 161
Chicago, IL 60612-3861

Phone

(312) 942-4252

NPI assigned

Mar 27, 2020

Last updated

May 4, 2026By 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 1

Addresses

Medicare fee-for-service enrollment

Enrolled in NE, IL2 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

Specialty

Nephrology

Education

At Still Un of HLTH Sciences, Col of Osteo Med, Mesa, 2020

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Unmc PhysiciansGroup PAC ID 6002728391, 1,490 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• The Nebraska Medical Center Hospital, Omaha, NE, CCN 280013

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: nleonardi438882@direct.nebraskamed.com

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.

• Unmc Physicians

  • Multi-Specialty Clinic/Center
  • Omaha, NE
  • NPI 1417912114
  Medicare reassignment Care Compare group NPD
• Rush University Medical Group

  dba Rush University Internists

  • Internal Medicine Physician
  • Chicago, IL
  • NPI 1093819542
  Medicare reassignment

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

• The Nebraska Medical Center

  dba The Nebraska Medical Center - Nebraska Medicine

  • General Acute Care Hospital
  • Omaha, NE
  • NPI 1356307581
  Care Compare affiliation

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

{
    "created_epoch": "1585267200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1777852800000",
    "number": "1427685445",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1725 W HARRISON ST STE 161",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606123861",
            "telephone_number": "312-942-4252"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1725 W HARRISON ST STE 161",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606123861",
            "telephone_number": "312-942-4252"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "8414 Naab Rd Ste 100",
            "address_purpose": "LOCATION",
            "city": "Indianapolis",
            "state": "IN",
            "postal_code": "462601972",
            "country_code": "US",
            "telephone_number": "317-338-7510",
            "fax_number": "317-338-7539",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "LEONARDI",
        "first_name": "NATHANIEL",
        "middle_name": "JOSEPH",
        "name_prefix": "Dr.",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-03-27",
        "last_updated": "2026-05-04",
        "certification_date": "2026-05-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RN0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Nephrology",
            "state": "IL",
            "license": "036.179518",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Marcella Borgman Leonard, DDS
• Mary Leonard
• Nicole Leonard
• Rebecca Marie Leonard, DDS
• Sherald R Leonard, M.D.
• Katherine Leonardis, DC
• Caroline Larkin Leonczyk, PHD
• Anngela Leone
• Anna Leong, RPH
• Danielle F Leong, O.D.

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

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 4, 2026; 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.