Mason Intervention, Inc.

Primary specialty

Behavior AnalystTaxonomy code 103K00000X

Legal business name

MASON INTERVENTION, INC.

Practice address

1213 Wilmette Ave Ste 207
Wilmette, IL 60091-2566

Phone

(847) 271-6840

NPI assigned

Feb 25, 2026

Last updated

Feb 25, 2026By the provider in NPPES

Organization subpart

No

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

Authorized official

Name

Gwen Fiske, PH.D.

Title

Owner & Director

Phone

(847) 271-6840

Specialties & licenses 1

Addresses

Locations

Practitioners 1

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles, and the practitioner matching its NPPES authorized official.

• Gwendolyn Mason Fiske, PH.D.

  • Specialist
  • Evanston, IL
  • NPI 1962737379
  NPD

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

{
    "created_epoch": "1771977600000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1771977600000",
    "number": "1548114564",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1213 WILMETTE AVE STE 207",
            "city": "WILMETTE",
            "state": "IL",
            "postal_code": "600912566",
            "telephone_number": "847-271-6840"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1213 WILMETTE AVE STE 207",
            "city": "WILMETTE",
            "state": "IL",
            "postal_code": "600912566",
            "telephone_number": "847-271-6840"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "MASON INTERVENTION, INC.",
        "organizational_subpart": "NO",
        "enumeration_date": "2026-02-25",
        "last_updated": "2026-02-25",
        "certification_date": "2026-02-25",
        "status": "A",
        "authorized_official_last_name": "FISKE",
        "authorized_official_first_name": "GWEN",
        "authorized_official_title_or_position": "OWNER & DIRECTOR",
        "authorized_official_telephone_number": "847-271-6840",
        "authorized_official_credential": "PH.D."
    },
    "taxonomies": [
        {
            "code": "103K00000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Behavior Analyst",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

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• Behavior Analyst in Wilmette, IL
• Providers in Wilmette, IL by specialty
• Behavior Analyst in Illinois

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