Mara Grace Downing, MD

Primary specialty

Student in an Organized Health Care Education/Training ProgramTaxonomy code 390200000X

Practice address

3 Saint Elizabeth Blvd Ste 4000
O Fallon, IL 62269-1284

Phone

(618) 233-5480

Fax

(184) 445-8791

NPI assigned

Mar 28, 2026

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other names 1

• Mara Grace Keller Former name

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

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.

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

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

{
    "created_epoch": "1774656000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1774656000000",
    "number": "1003756461",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3 SAINT ELIZABETH BLVD STE 4000",
            "city": "O FALLON",
            "state": "IL",
            "postal_code": "622691284",
            "telephone_number": "618-233-5480",
            "fax_number": "184-445-8791"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3 SAINT ELIZABETH BLVD STE 4000",
            "city": "O FALLON",
            "state": "IL",
            "postal_code": "622691284",
            "telephone_number": "618-233-5480",
            "fax_number": "184-445-8791"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DOWNING",
        "first_name": "MARA",
        "middle_name": "GRACE",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2026-03-28",
        "last_updated": "2026-03-28",
        "certification_date": "2026-03-28",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "MARA",
            "last_name": "KELLER",
            "middle_name": "GRACE",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Angie Christina Dolosic
• Gwen M Donley
• Randall E Dooley, MD
• Christina H Dothager, M.D.
• Jakia Douglas
• Dr Mukaia Mitchom Lockett LLC
• Susan Grace Drabing, FNP-BC
• Dawn Drewes, APN
• DRS Selberg & Rice PLLC
• Vincent Joseph Duenas, MD

• All providers in O Fallon, IL
• Student in an Organized Health Care Education/Training Program in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 28, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.