Isaac Sergei Horowitz, DO

Primary specialty

Pediatrics PhysicianTaxonomy code 208000000X

License

20A20038 Issued in CA

Practice address

344 E 6TH St
Madera, CA 93638-3631

Phone

(559) 871-5844

Fax

(559) 479-4812

NPI assigned

Apr 11, 2019

Sex

Male

Sole proprietor

Yes

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: isaac.horowitz.1@25900.direct.athenahealth.com

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.

• Camarena Health

  • Federally Qualified Health Center (FQHC)
  • Madera, CA
  • NPI 1891778114

  Single Specialty

  Medicare reassignment NPD
• Camarena Health

  • Federally Qualified Health Center (FQHC)
  • Los Banos, CA
  • NPI 1114757754
  NPD
• Camarena Health

  • Federally Qualified Health Center (FQHC)
  • Chowchilla, CA
  • NPI 1447309885
  NPD
• Sierra View Local Health Care District

  • General Acute Care Hospital
  • Porterville, CA
  • NPI 1639143381
  NPD (past)
• Valley Children'S Primary Care Group, Inc.

  • Pediatrics Physician
  • Bakersfield, CA
  • NPI 1760877245

  Single Specialty

  NPD (past)

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

{
    "created_epoch": "1554940800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758067200000",
    "number": "1982167375",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "344 E 6TH ST",
            "city": "MADERA",
            "state": "CA",
            "postal_code": "936383631",
            "telephone_number": "559-871-5844",
            "fax_number": "559-479-4812"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "344 E 6TH ST",
            "city": "MADERA",
            "state": "CA",
            "postal_code": "936383631",
            "telephone_number": "559-871-5844",
            "fax_number": "559-479-4812"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HOROWITZ",
        "first_name": "ISAAC",
        "middle_name": "SERGEI",
        "credential": "DO",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2019-04-11",
        "last_updated": "2025-09-17",
        "certification_date": "2025-09-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208000000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Pediatrics",
            "state": "CA",
            "license": "20A20038",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Linda K Holcroft, LICENSED OPTICIAN
• James Weston Hole, DO
• Lorenzo Rudolph Holguin, P.A.
• Holy Family Counseling
• Sara Helena Horan, MD
• James Clifton Horspool, DO
• Hosea William Hawkins, DO
• Kelly Hosey, PT, DPT
• Lucas Shay Houston Jr., M.A. SPEECH PATH
• Douglas Tyler Howell, PA-C

• Pediatrics Physician in Madera, CA
• Providers in Madera, CA by specialty
• Pediatrics Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 17, 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.