Pia Gabrielle Isidro Alfonso, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

A209254 Issued in CA

Practice address

9961 Sierra Ave
Fontana, CA 92335-6720

Phone

(888) 750-0036

NPI assigned

Jun 7, 2023

Last updated

Sep 24, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in MA

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

Interoperability endpoints

• Direct secure messaging: palfonso251837@direct.bmc.masshiway.net
• Direct secure messaging: pia.alfonso.1@2017.direct.athenahealth.com

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

{
    "created_epoch": "1686096000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790208000000",
    "number": "1356035737",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "9961 SIERRA AVE",
            "city": "FONTANA",
            "state": "CA",
            "postal_code": "923356720",
            "telephone_number": "888-750-0036"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "9961 SIERRA AVE",
            "city": "FONTANA",
            "state": "CA",
            "postal_code": "923356720",
            "telephone_number": "888-750-0036"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "736 Cambridge Street",
            "address_purpose": "LOCATION",
            "city": "Boston",
            "state": "MA",
            "postal_code": "02135",
            "country_code": "US",
            "telephone_number": "617-789-3000",
            "fax_number": "617-789-2438",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ALFONSO",
        "first_name": "PIA GABRIELLE",
        "middle_name": "ISIDRO",
        "name_prefix": "Ms.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2023-06-07",
        "last_updated": "2026-09-24",
        "certification_date": "2026-09-24",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "A209254",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MA",
            "license": "3014865",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Ashley Hao-Ai Alexander, D.O.
• Alexandra Ayoub, DDS., a Professional Corporation
• Sandra Jamilette Alfaro Beltran, PSY.D.
• Omar Alfaro, DDS
• Anaivis Alfonso Gonzalez, FNP
• Alfred B Dadivas MD Inc
• Aavaisra Ali
• Hena Ali
• Uzma Rifat Ali, MD
• Michael Mohamed Aljabban, D.M.D

• Internal Medicine Physician in Fontana, CA
• Providers in Fontana, CA by specialty
• Internal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 24, 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.