Alexander Jacob Sironen

Primary specialty

Physical TherapistTaxonomy code 225100000X

License

0021145 Issued in CO

Practice address

8580 E Lowry Blvd
Denver, CO 80230-6932

Phone

(303) 547-9310

NPI assigned

Feb 26, 2026

Last updated

Feb 26, 2026By the provider in NPPES

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 CO

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

Denver Physical Therapy, P.C.Group PAC ID 2961316500, 61 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

State licenses

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Denver Physical Therapy, P.C.

  dba Proactive Greeley

  • Physical Therapist
  • Greeley, CO
  • NPI 1154593960
  Medicare reassignment Care Compare group

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

{
    "created_epoch": "1772064000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1772064000000",
    "number": "1952255705",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5335 S VALENTIA WAY APT 389",
            "city": "GREENWOOD VILLAGE",
            "state": "CO",
            "postal_code": "801113123"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "8580 E LOWRY BLVD",
            "city": "DENVER",
            "state": "CO",
            "postal_code": "802306932",
            "telephone_number": "303-547-9310"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIRONEN",
        "first_name": "ALEXANDER",
        "middle_name": "JACOB",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2026-02-26",
        "last_updated": "2026-02-26",
        "certification_date": "2026-02-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "225100000X",
            "taxonomy_group": "",
            "desc": "Physical Therapist",
            "state": "CO",
            "license": "0021145",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Karim Emile Sirgi, MD
• Jackky Sirichantho, M.A
• Ilene Y Siringo, O.D.
• Sirinity Wellness LLC (The ART Center)
• Thomas G Sirokman, CRNA
• Jeffrey Sirota, MD
• Nahom Frezer Sisay
• Kimberley Stasia Siscoe, M.D.
• Sanne Siska
• Dana Siskind, MSW

• Physical Therapist in Denver, CO
• Providers in Denver, CO by specialty
• Physical Therapist in Colorado

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 26, 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.