Alexander Ong Sy, MD, MBA, MSL

Primary specialty

Critical Care Medicine (Internal Medicine) PhysicianTaxonomy code 207RC0200X

License

177284 Issued in CA

Practice address

11201 Benton St
Loma Linda, CA 92357-0001

Phone

(909) 825-7084

NPI assigned

Mar 2, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 4

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

Credentials

Master of Business Administration, Doctor of Medicine, Master of Science - Law

State licenses

Practice roles

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Department of Internal Medicine

  • Internal Medicine Physician
  • Columbia, SC
  • NPI 1144258922
  NPD (past)
• Pulmonary Disease and Critical Care Associates, P.a.

  dba Center for Sleep Disorders/Behavioral Sleep Medicine

  • Clinical Psychologist
  • Columbia, MD
  • NPI 1972838316
  NPD (past)
• Pulmonary Disease and Critical Care Associates, PA.,

  dba Pulmonary Disease and Critical Care Assoc Center for Sleep Disorders

  • Sleep Medicine (Internal Medicine) Physician
  • Columbia, MD
  • NPI 1033347877
  NPD (past)

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

{
    "created_epoch": "1141257600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1741219200000",
    "number": "1144297748",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1724 CAMELLIA LN",
            "city": "REDLANDS",
            "state": "CA",
            "postal_code": "923741414",
            "telephone_number": "336-793-7278"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "11201 BENTON ST",
            "city": "LOMA LINDA",
            "state": "CA",
            "postal_code": "923570001",
            "telephone_number": "909-825-7084"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SY",
        "first_name": "ALEXANDER",
        "middle_name": "ONG",
        "name_prefix": "Dr.",
        "credential": "MD, MBA, MSL",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-02",
        "last_updated": "2025-03-06",
        "certification_date": "2025-03-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RP1001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "CA",
            "license": "177284",
            "primary": false
        },
        {
            "code": "207RS0012X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Sleep Medicine",
            "state": "CA",
            "license": "177284",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "177284",
            "primary": false
        },
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "CA",
            "license": "177284",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "266223",
            "state": "SC"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Richard J Swabb, M.D.
• Mary Swanson
• Ava Swanstrom
• Megan Mackenzie Sweeney, PHD
• Thomas Joseph Sweeney, NP
• Mallery Sy
• Hasan Mahmood Syed, M.D.
• Zubair Syed, M.D.
• Ryan Sylvester
• Megann Leigh Synnott

• Critical Care Medicine (Internal Medicine) Physician in Loma Linda, CA
• Providers in Loma Linda, CA by specialty
• Critical Care Medicine (Internal Medicine) Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 6, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.