Alexander Horwitz, MD

Primary specialty

Psychiatry PhysicianTaxonomy code 2084P0800X

License

A181639 Issued in CA

Practice address

2100 Napa Vallejo Hwy
Napa, CA 94558-6234

Phone

(707) 253-5000

NPI assigned

May 12, 2020

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

Electronic endpoints 1

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

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.

• Department of State Hospitals

  • Psychiatric Hospital
  • Coalinga, CA
  • NPI 1124078704
  Medicare reassignment NPD
• Department of State Hospitals

  • Psychiatric Hospital
  • Atascadero, CA
  • NPI 1174573802
  NPD
• Department of State Hospitals

  • Psychiatric Hospital
  • Napa, CA
  • NPI 1326098161
  NPD

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

{
    "created_epoch": "1589241600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1754784000000",
    "number": "1891317954",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2100 NAPA VALLEJO HWY",
            "city": "NAPA",
            "state": "CA",
            "postal_code": "945586234"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2100 NAPA VALLEJO HWY",
            "city": "NAPA",
            "state": "CA",
            "postal_code": "945586234",
            "telephone_number": "707-253-5000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "147 N Brent St",
            "address_purpose": "LOCATION",
            "city": "Ventura",
            "state": "CA",
            "postal_code": "930032854",
            "country_code": "US",
            "telephone_number": "805-948-5672",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "Hillmont Psychiatric Center",
            "address_2": "200 Hillmont Av",
            "address_purpose": "LOCATION",
            "city": "Ventura",
            "state": "CA",
            "postal_code": "93003",
            "country_code": "US",
            "telephone_number": "805-652-6729",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "10333 El Camino Real",
            "address_purpose": "LOCATION",
            "city": "Atascadero",
            "state": "CA",
            "postal_code": "934225808",
            "country_code": "US",
            "telephone_number": "805-468-2000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HORWITZ",
        "first_name": "ALEXANDER",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-05-12",
        "last_updated": "2025-08-10",
        "certification_date": "2025-08-10",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "CA",
            "license": "A181639",
            "primary": false
        },
        {
            "code": "2084P0800X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Psychiatry",
            "state": "CA",
            "license": "A181639",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "alexander.horwitz@ventura.cernerdirect.com",
            "affiliation": "N",
            "endpointDescription": "Cerner Direct Secure Email",
            "use": "DIRECT",
            "useDescription": "Direct",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "Direct Information",
            "address_1": "Hillmont Psychiatric Center",
            "address_2": "200 Hillmont Av",
            "city": "Ventura",
            "state": "CA",
            "country_code": "US",
            "postal_code": "93003",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Daniel Horgan, DPT
• Angelique Hornage
• Kristijan Hornung
• Robert John Horon, PHD
• Javecia M Horton
• Danielle Horwitz
• Zoe House
• Patricia Denise Howard, OT
• Ron Howard, RT, OTC
• Sylvia Faye Howard, DDS

• Psychiatry Physician in Napa, CA
• Providers in Napa, CA by specialty
• Psychiatry Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 10, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.