Ian Williamson

Primary specialty

Physical TherapistTaxonomy code 225100000X

Practice address

9494 W Northern Ave Ste 114&115
Glendale, AZ 85305-1118

Phone

(623) 745-3112

NPI assigned

Feb 5, 2026

Sex

Male

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

Enrolled in AZ

Enrollment records 1

Specialty

Physical Therapist in Private Practice

Education

Other, 2025

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Ati Holdings of Arizona LLCGroup PAC ID 2466732862, 223 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

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.

• Ati Holdings of Arizona, LLC

  • Physical Therapist
  • Phoenix, AZ
  • NPI 1871570309
  Medicare reassignment Care Compare group NPD

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

{
    "created_epoch": "1770249600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1770249600000",
    "number": "1396696381",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2001 BUTTERFIELD RD STE 1600",
            "city": "DOWNERS GROVE",
            "state": "IL",
            "postal_code": "605151211",
            "fax_number": "702-568-0195"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "9494 W NORTHERN AVE STE 114&115",
            "city": "GLENDALE",
            "state": "AZ",
            "postal_code": "853051118",
            "telephone_number": "623-745-3112"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WILLIAMSON",
        "first_name": "IAN",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2026-02-05",
        "last_updated": "2026-02-05",
        "certification_date": "2026-02-05",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "225100000X",
            "taxonomy_group": "",
            "desc": "Physical Therapist",
            "state": "AZ",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Rodeline Williams
• Searray Williams
• Tana A Williams
• Torvaja Williams
• Zoe McLean Williams, RBT
• Natassia Lynn Williamson, FNP-C
• Paul Williot
• Emilie M Willis, M.H.S, CCC-SLP
• Megan Willis
• Willow and Root Counseling LLC

• Physical Therapist in Glendale, AZ
• Providers in Glendale, AZ by specialty
• Physical Therapist in Arizona

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 5, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.