Antonios Anthony Diamantopoulos, M.D.

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

License

125.086800 Issued in IL

Practice address

5140 N. California Avenue
Chicago, IL 60625

Phone

(773) 878-8200

NPI assigned

May 29, 2025

Sex

Male

Sole proprietor

Yes

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Medicine

State licenses

Interoperability endpoints

• Direct secure messaging: adiamantopoulos809628@direct.ochin.org

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

{
    "created_epoch": "1748476800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1780012800000",
    "number": "1790678951",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5140 N. CALIFORNIA AVENUE",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "60625",
            "telephone_number": "773-878-8200"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5140 N. CALIFORNIA AVENUE",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "60625",
            "telephone_number": "773-878-8200"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DIAMANTOPOULOS",
        "first_name": "ANTONIOS",
        "middle_name": "ANTHONY",
        "name_prefix": "Mr.",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2025-05-29",
        "last_updated": "2026-05-29",
        "certification_date": "2026-05-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "IL",
            "license": "125.086800",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Dialysis Centers of America - Illinois, Inc. (RCG Northwestern)
• Dialysis Centers of America - Illinois, Inc. (RCG Garfield)
• Dialysis Centers of America - Illinois, Inc. (Fresenius Medical Care Prairie)
• Dialysis Centers of America - Illinois, Inc. (RCG Rogers Park)
• Dialysis Newco LLC (U.S. Renal Care Scottsdale Dialysis)
• Nicholas James Diamantopoulos, MD
• Diamond Dialysis Inc.
• Diamond Electric Contracting Inc.
• Diamond Headache Clinic LTD
• Ann Diamond, PSY.D.

• Family Medicine Physician in Chicago, IL
• Providers in Chicago, IL by specialty
• Family Medicine Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 29, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.