Karla Abigail Islas-Kostszewa

Primary specialty

Clinical Social WorkerTaxonomy code 1041C0700X

License

96754 Issued in CA

Practice address

10331 Stanford Ave
Garden Grove, CA 92840-6351

Phone

(714) 663-6000

NPI assigned

Oct 2, 2017

Sex

Female

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: No
• Power mobility devices: No
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

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.

• Grow Healthcare Group PC

  • Mental Health Counselor
  • San Jose, CA
  • NPI 1154994846
  Medicare reassignment NPD

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

{
    "created_epoch": "1506902400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779062400000",
    "number": "1346750650",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 845",
            "city": "LOS ALAMITOS",
            "state": "CA",
            "postal_code": "907200845",
            "telephone_number": "949-385-0092"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "10331 STANFORD AVE",
            "city": "GARDEN GROVE",
            "state": "CA",
            "postal_code": "928406351",
            "telephone_number": "714-663-6000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "PO Box 845",
            "address_purpose": "LOCATION",
            "city": "Los Alamitos",
            "state": "CA",
            "postal_code": "907200845",
            "country_code": "US",
            "telephone_number": "949-385-0092",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "ISLAS-KOSTSZEWA",
        "first_name": "KARLA",
        "middle_name": "ABIGAIL",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2017-10-02",
        "last_updated": "2026-05-18",
        "certification_date": "2026-05-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "104100000X",
            "taxonomy_group": "",
            "desc": "Social Worker",
            "state": "CA",
            "license": "ASW77339",
            "primary": false
        },
        {
            "code": "101YM0800X",
            "taxonomy_group": "",
            "desc": "Counselor, Mental Health",
            "state": null,
            "license": null,
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "CA",
            "license": "96754",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Tony Kurema Irungu
• Crystal Leila Hatsumi Ishihara
• Samantha Arellano Isidro, PHARMD
• Benjamin C Isip, RPT/L
• Mesbah Islam
• Katrina Ives
• Jasmine Ivory
• Iwashita Chiropractic Corp
• Thomas Y. Iwashita, DC
• Haruo Iwo, DC

• Clinical Social Worker in Garden Grove, CA
• Providers in Garden Grove, CA by specialty
• Clinical Social Worker in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 18, 2026; 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.