Gabriel Lok-Hymn Si, MD

Primary specialty

Pediatric Anesthesiology PhysicianTaxonomy code 207LP3000X

License

036.171190 Issued in IL

Practice address

225 E Chicago Ave
Chicago, IL 60611-2991

Phone

(312) 227-4000

NPI assigned

Jan 15, 2020

Last updated

Aug 3, 2026By 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 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Eligible to order & refer

• Part B services: No
• Medical equipment: Yes
• Home health: No
• Power mobility devices: Yes
• Hospice: No

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": "1579046400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785715200000",
    "number": "1689204810",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "225 E CHICAGO AVE",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606112991",
            "telephone_number": "312-227-4000"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "225 E CHICAGO AVE",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606112991",
            "telephone_number": "312-227-4000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SI",
        "first_name": "GABRIEL",
        "middle_name": "LOK-HYMN",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2020-01-15",
        "last_updated": "2026-08-03",
        "certification_date": "2026-08-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207LP3000X",
            "taxonomy_group": "",
            "desc": "Anesthesiology, Pediatric Anesthesiology",
            "state": "IL",
            "license": "036.171190",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Shyam M Puppala MDSC
• Shyam M Puppala MDSC
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• Elana Shyman, BCBA
• Si Herman DPM LTD
• Ashley Siadek, PT, DPT
• Carlos R Sian, MPH, PA-C
• George Sianis, MD
• Erika Siauciunas
• Siaw Enterprises, LLC

• Pediatric Anesthesiology Physician in Chicago, IL
• Providers in Chicago, IL by specialty
• Pediatric Anesthesiology Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 3, 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.