William T Chao, M.D.

Primary specialty

Neonatal-Perinatal Medicine PhysicianTaxonomy code 2080N0001X

License

R9BOO Issued in MO

Practice address

615 S New Ballas Rd
Saint Louis, MO 63141-8221

Phone

(314) 251-6450

NPI assigned

Apr 19, 2006

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

Other identifiers 2

Medicare fee-for-service enrollment

Enrolled in MO

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

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

{
    "created_epoch": "1145404800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1922063205",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "621 S NEW BALLAS RD",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631418241",
            "telephone_number": "314-251-5860",
            "fax_number": "314-251-5861"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "615 S NEW BALLAS RD",
            "city": "SAINT LOUIS",
            "state": "MO",
            "postal_code": "631418221",
            "telephone_number": "314-251-6450"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CHAO",
        "first_name": "WILLIAM",
        "middle_name": "T",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-04-19",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080N0001X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Neonatal-Perinatal Medicine",
            "state": "MO",
            "license": "R9BOO",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BNDD",
            "identifier": "2710209",
            "state": "MO"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "STATE LICENSE",
            "identifier": "R9BOO",
            "state": "MO"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Change Course, LLC
• Changing Lives Home Care Assistance Inc
• Changing Peoples Reaction Solutions LLC
• Alexa Chanos, MD
• Leigh C Chao, MD
• Udita Chapagain, MD
• Cassidy Faith Chapman, PMHNP
• Jerry Richard Chapman
• Lena J Chapman, LPC
• Matthew Brandon Chapman, MD

• Neonatal-Perinatal Medicine Physician in Saint Louis, MO
• Providers in Saint Louis, MO by specialty
• Neonatal-Perinatal Medicine Physician in Missouri

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.