Isabel Kathryn O'Brien, MS

Primary specialty

Speech-Language PathologistTaxonomy code 235Z00000X

License

SP36052 Issued in CA

Practice address

4100 Normal St
San Diego, CA 92103-2653

Phone

(619) 725-5501

NPI assigned

May 6, 2019

Sex

Female

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Master of Science

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 and National Provider Directory roles.

• Speech Tree Speech Therapy Center, Inc.

  dba Speech Tree Therapy Center

  • Speech-Language Pathologist
  • San Diego, CA
  • NPI 1720334501
  NPD (past)
• Xcite Steps, LLC

  • Behavior Analyst
  • San Diego, CA
  • NPI 1336581271
  NPD (past)

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

{
    "created_epoch": "1557100800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1774396800000",
    "number": "1891350716",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "4463 IDAHO ST APT 13",
            "city": "SAN DIEGO",
            "state": "CA",
            "postal_code": "921165126",
            "telephone_number": "408-802-5568"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "4100 NORMAL ST",
            "city": "SAN DIEGO",
            "state": "CA",
            "postal_code": "921032653",
            "telephone_number": "619-725-5501"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2820 Camino Del Rio S Ste 308",
            "address_purpose": "LOCATION",
            "city": "San Diego",
            "state": "CA",
            "postal_code": "921083824",
            "country_code": "US",
            "telephone_number": "619-546-0039",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "O'BRIEN",
        "first_name": "ISABEL",
        "middle_name": "KATHRYN",
        "credential": "MS",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2019-05-06",
        "last_updated": "2026-03-25",
        "certification_date": "2026-03-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "235Z00000X",
            "taxonomy_group": "",
            "desc": "Speech-Language Pathologist",
            "state": "CA",
            "license": "SP36052",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Christopher Flint O'Brien, M.D.
• Christopher Mark O'Brien, MD
• Deanna O'Brien
• Elizabeth O'Brien, N.P.
• Genevieve Erin O'Brien, AMFT
• Jared Michael O'Brien
• Jessika O'Brien, PAC, MMS
• Kiendra O'Brien
• Krista Noel O'Brien, MPT
• Madeline O'Brien

• Speech-Language Pathologist in San Diego, CA
• Providers in San Diego, CA by specialty
• Speech-Language Pathologist in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 25, 2026; 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.