Patrick Emerson Day, MD

Primary specialty

Pediatric Cardiology PhysicianTaxonomy code 2080P0202X

License

T6547 Issued in TX

Practice address

4900 Mueller Blvd
Austin, TX 78723-3079

Phone

(512) 324-0000

NPI assigned

Mar 24, 2019

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

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.

Specialty

Pediatric MedicineAlso: Cardiovascular Disease (Cardiology)

Education

Other, 2019

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

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": "1553385600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1780531200000",
    "number": "1003376138",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5904 AYLFORD CT",
            "city": "AUSTIN",
            "state": "TX",
            "postal_code": "787391648",
            "telephone_number": "713-705-4303"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4900 MUELLER BLVD",
            "city": "AUSTIN",
            "state": "TX",
            "postal_code": "787233079",
            "telephone_number": "512-324-0000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DAY",
        "first_name": "PATRICK",
        "middle_name": "EMERSON",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-03-24",
        "last_updated": "2026-06-04",
        "certification_date": "2026-06-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080P0202X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Cardiology",
            "state": "TX",
            "license": "T6547",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Avis M Day, MD
• Francys Day, D.D.S.
• Janet Elizabeth Day, LVN
• John Wickliffe Day, M.D.
• Nicole Roberta Day
• Savannah Kay Day
• Kimberlee Dayal, NP
• Melani Inoka Dayal, ACNS-BC
• Anitha Dayalan, MD
• Mercedes Dayan

• Pediatric Cardiology Physician in Austin, TX
• Providers in Austin, TX by specialty
• Pediatric Cardiology Physician in Texas

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