Erin K. Willits, MD

Primary specialty

Allergy & Immunology PhysicianTaxonomy code 207K00000X

License

DR.0063320 Issued in CO

Practice address

2121 E Harmony Rd Unit 290
Fort Collins, CO 80528-3402

Phone

(970) 221-2370

Fax

(970) 221-9654

NPI assigned

Jun 29, 2012

Last updated

Sep 29, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other identifiers 5

Other names 1

• Erin K Catellier Former name

Medicare fee-for-service enrollment

Enrolled in CO, WY2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Allergy/Immunology

Education

University of Washington School of Medicine, 2012

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Allergy Partners of Colorado, PCGroup PAC ID 8123343993, 6 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Banner North Colorado Medical Center Hospital, Greeley, CO, CCN 060001
• Poudre Valley Hospital Hospital, Fort Collins, CO, CCN 060010
• Cheyenne Regional Medical Center Hospital, Cheyenne, WY, CCN 530014

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

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, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Allergy Partners of Colorado PC

  • Allergy & Immunology Physician
  • Fort Collins, CO
  • NPI 1891183299

  WY

  Medicare reassignment Care Compare group NPD
• Allergy Partners of Colorado, PC

  dba Allergy Partners of Northern Colorado

  • Allergy & Immunology Physician
  • Greeley, CO
  • NPI 1235722489
  NPD
• Allergy Partners, PLLC

  dba Allergy Partners of the Upstate

  • Allergy & Immunology Physician
  • Greenville, SC
  • NPI 1215927462
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• North Colorado Medical Center

  • General Acute Care Hospital
  • Loveland, CO
  • NPI 1174231682
  Care Compare affiliation
• North Colorado Medical Center

  • Critical Access Hospital
  • Greeley, CO
  • NPI 1255971404
  Care Compare affiliation
• North Colorado Medical Center

  • Ambulance
  • Greeley, CO
  • NPI 1457850430

  Hospital

  Care Compare affiliation
• North Colorado Medical Center

  • General Acute Care Hospital
  • Greeley, CO
  • NPI 1477376986
  Care Compare affiliation
• North Colorado Medical Center

  • Special Hospital
  • Loveland, CO
  • NPI 1487535431
  Care Compare affiliation
• North Colorado Medical Center

  • Critical Access Hospital
  • Greeley, CO
  • NPI 1578103750
  Care Compare affiliation
• North Colorado Medical Center

  • Emergency Care Clinic/Center
  • Greeley, CO
  • NPI 1588928519

  Hospital

  Care Compare affiliation
• North Colorado Medical Center

  • Infusion Therapy Clinic/Center
  • Loveland, CO
  • NPI 1700668183

  Hospital

  Care Compare affiliation
• North Colorado Medical Center

  • General Acute Care Hospital
  • Greeley, CO
  • NPI 1720004450
  Care Compare affiliation
• North Colorado Medical Center

  • Critical Access Hospital
  • Greeley, CO
  • NPI 1831739267
  Care Compare affiliation
• North Colorado Medical Center

  • Ambulance
  • Greeley, CO
  • NPI 1861989212

  Hospital

  Care Compare affiliation
• North Colorado Medical Center

  dba Mountain Vista

  • General Acute Care Hospital
  • Greeley, CO
  • NPI 1962103622
  Care Compare affiliation

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

{
    "created_epoch": "1340928000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790640000000",
    "number": "1962766402",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 603725",
            "city": "CHARLOTTE",
            "state": "NC",
            "postal_code": "282603725",
            "telephone_number": "828-575-2625",
            "fax_number": "828-350-2174"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2121 E HARMONY RD UNIT 290",
            "city": "FORT COLLINS",
            "state": "CO",
            "postal_code": "805283402",
            "telephone_number": "970-221-2370",
            "fax_number": "970-221-9654"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "6252 Yellowstone Rd",
            "address_purpose": "LOCATION",
            "city": "Cheyenne",
            "state": "WY",
            "postal_code": "820093432",
            "country_code": "US",
            "telephone_number": "307-778-2015",
            "fax_number": "307-778-7060",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "WILLITS",
        "first_name": "ERIN",
        "middle_name": "K.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2012-06-29",
        "last_updated": "2026-09-29",
        "certification_date": "2023-10-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207K00000X",
            "taxonomy_group": "",
            "desc": "Allergy & Immunology",
            "state": "CO",
            "license": "DR.0063320",
            "primary": true
        },
        {
            "code": "207K00000X",
            "taxonomy_group": "",
            "desc": "Allergy & Immunology",
            "state": "WY",
            "license": "12626A",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDICARE PTAN",
            "identifier": "W31876",
            "state": "WY"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "9000177898",
            "state": "CO"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "155603700",
            "state": "WY"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "10027193200",
            "state": "NE"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDICARE PTAN",
            "identifier": "883496",
            "state": "CO"
        }
    ],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "ERIN",
            "last_name": "CATELLIER",
            "middle_name": "K",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Helena Williamson
• Shannon Williamson
• Jamie Willingham
• Winston James Willis
• Jon R Willison, DDS
• Ronda Loreen Willmot, AU.D., CCC-A
• Brant Michael Willoughby, C.O.T.A.
• Willow Collective
• Willow Collective
• Willow Collective Foundation

• Allergy & Immunology Physician in Fort Collins, CO
• Providers in Fort Collins, CO by specialty
• Allergy & Immunology Physician in Colorado

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 29, 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.
• 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.