Sergio Jose Marquez, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

A198101 Issued in CA

Practice address

11234 Anderson Street, Gme Office Westerly Suite C
Loma Linda, CA 92354-2804

Phone

(909) 558-4085

NPI assigned

May 27, 2021

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

Enrolled in CA

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

Specialty

Emergency Medicine

Education

Other, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Em Alliance California ApcGroup PAC ID 1951749894, 68 clinicians

Singh MD a Professional MedicalGroup PAC ID 8426584988, 18 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Palmdale Regional Medical Center Hospital, Palmdale, CA, CCN 050204
• Barstow Community Hospital Hospital, Barstow, CA, CCN 050298

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

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

• Em Alliance California, Apc

  • Emergency Medicine Physician
  • Murrieta, CA
  • NPI 1376305755
  Medicare reassignment Care Compare group NPD
• Singh MD a Professional Medical

  • Emergency Medicine Physician
  • Barstow, CA
  • NPI 1336971514
  Medicare reassignment Care Compare group NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Hospital of Barstow Inc

  • General Acute Care Hospital
  • Barstow, CA
  • NPI 1780655670
  Care Compare affiliation
• Lancaster Hospital Corporation

  • General Acute Care Hospital
  • Palmdale, CA
  • NPI 1508856535
  Care Compare affiliation

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

{
    "created_epoch": "1622073600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1759449600000",
    "number": "1851967178",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "820 E MOUNTAIN VIEW ST",
            "city": "BARSTOW",
            "state": "CA",
            "postal_code": "923113004",
            "telephone_number": "858-863-7382",
            "fax_number": "858-201-5136"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "11234 ANDERSON STREET, GME OFFICE WESTERLY SUITE C",
            "city": "LOMA LINDA",
            "state": "CA",
            "postal_code": "923542804",
            "telephone_number": "909-558-4085"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "820 E Mountain View St",
            "address_purpose": "LOCATION",
            "city": "Barstow",
            "state": "CA",
            "postal_code": "923113004",
            "country_code": "US",
            "telephone_number": "858-863-7382",
            "fax_number": "858-863-7382",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MARQUEZ",
        "first_name": "SERGIO",
        "middle_name": "JOSE",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-05-27",
        "last_updated": "2025-10-03",
        "certification_date": "2025-10-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CA",
            "license": "A198101",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Carmen Marmo, PA-C
• Maverick Doctolero Marpa, MD
• Silaine Marques
• Courtney Marquez, PA-C
• Kathryn Nicole Barbaza Marquez, MD
• Wesley Benjamin Marquis, PT DPT
• Robert Marsa, M.D.
• Alexander William Marshall, MD
• Alexis Marshall
• Blaze Reilley Marshall

• Emergency Medicine Physician in Loma Linda, CA
• Providers in Loma Linda, CA by specialty
• Emergency Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 3, 2025; 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.