William Hayes Armstrong, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

A200987 Issued in CA

Practice address

1401 S Grand Ave
Los Angeles, CA 90015-3010

Phone

(213) 748-2411

NPI assigned

Jun 13, 2022

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

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

Virginia Commonwealth University, School of Medicine, 2022

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Golden State Emergency Physicians IncGroup PAC ID 4981885951, 26 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Glendale Mem Hospital & HLTH Center Hospital, Glendale, CA, CCN 050058
• California Hospital Medical Center la Hospital, Los Angeles, CA, CCN 050149
• Northridge Hospital Medical Center Hospital, Northridge, CA, CCN 050116

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.

• Golden State Emergency Physicians Inc

  • Emergency Medicine Physician
  • Los Angeles, CA
  • NPI 1770886558
  Medicare reassignment Care Compare group NPD
• Ridgeline Emergency Physicians Medical Group, Inc.

  • Emergency Medicine Physician
  • Northridge, CA
  • NPI 1972953230
  Medicare reassignment NPD

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

• Dignity Community Care

  • General Acute Care Hospital
  • Los Angeles, CA
  • NPI 1114081056
  Care Compare affiliation
• Dignity Community Care

  • General Acute Care Hospital
  • Northridge, CA
  • NPI 1417089350
  Care Compare affiliation
• Dignity Community Care

  • General Acute Care Hospital
  • Glendale, CA
  • NPI 1477610640
  Care Compare affiliation

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

{
    "created_epoch": "1655078400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1751155200000",
    "number": "1245960293",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1401 S GRAND AVE",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900153010",
            "telephone_number": "213-748-2411"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1401 S GRAND AVE",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900153010",
            "telephone_number": "213-748-2411"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "VCUHS Dept of Emergency Medicine Residency",
            "address_2": "1250 E. Marshall Street",
            "address_purpose": "LOCATION",
            "city": "Richmond",
            "state": "VA",
            "postal_code": "232980401",
            "country_code": "US",
            "telephone_number": "804-828-0996",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ARMSTRONG",
        "first_name": "WILLIAM",
        "middle_name": "HAYES",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2022-06-13",
        "last_updated": "2025-06-29",
        "certification_date": "2025-06-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "VA",
            "license": "0116037078",
            "primary": false
        },
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "CA",
            "license": "A200987",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Kelsey Armstrong
• Megan Armstrong
• Olivia Catherine Armstrong
• Phillip Armstrong
• Risha Armstrong
• Nilo Ouano Arnaiz, MD
• Arnaud Kroener
• Dimiter Georgien Arnaudov, M.D.
• Heather Arndt, MFT INTERN
• Ursula Arndt, RN

• Emergency Medicine Physician in Los Angeles, CA
• Providers in Los Angeles, 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 Jun 29, 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.