Tiffany M Siefken, LCSW/LISW

Primary specialty

Clinical Social WorkerTaxonomy code 1041C0700X

License

09930293 Issued in CO

Practice address

2244 Miles House Ave Apt 108
Fort Collins, CO 80525-4191

Phone

(319) 316-2262

Fax

(888) 375-1723

NPI assigned

Jun 18, 2020

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

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

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.

• The Holistic Healing Center, LLC

  • Community/Behavioral Health Agency
  • Fort Collins, CO
  • NPI 1689318214
  NPD Authorized official

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

{
    "created_epoch": "1592438400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756252800000",
    "number": "1366068082",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2244 MILES HOUSE AVE APT 108",
            "city": "FORT COLLINS",
            "state": "CO",
            "postal_code": "805254191",
            "telephone_number": "319-316-2262",
            "fax_number": "888-375-1723"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2244 MILES HOUSE AVE APT 108",
            "city": "FORT COLLINS",
            "state": "CO",
            "postal_code": "805254191",
            "telephone_number": "319-316-2262",
            "fax_number": "888-375-1723"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SIEFKEN",
        "first_name": "TIFFANY",
        "middle_name": "M",
        "credential": "LCSW/LISW",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2020-06-18",
        "last_updated": "2025-08-27",
        "certification_date": "2025-08-27",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "IL",
            "license": "149.028517",
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "IA",
            "license": "100864",
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "CO",
            "license": "09930293",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Abby Sickels
• Kourtney Sidener
• Kate Meredith Sidgwick, RD
• Colleen K Sidhu, LCSW
• Lindsay Siebenaler, CRNA
• Kimberly Lynne Siegel, MD
• Leah Beth Siegel, PA-C
• Linda Marie Siegrist, RN
• Heather Sieler, PT
• Andrea D Siener, MSPT

• Clinical Social Worker in Fort Collins, CO
• Providers in Fort Collins, CO by specialty
• Clinical Social Worker in Colorado

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 27, 2025; 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.