NPIMap

Individual provider Active NPI

Derek Lee Fimmen, MD

  • Diagnostic Radiology Physician
  • Fort Collins, CO
National Provider Identifier
1952524449
Registry record updated Feb 4, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Diagnostic Radiology PhysicianTaxonomy code 2085R0202X
License
036.116382 Issued in IL
Practice address
2008 Caribou Dr
Fort Collins, CO 80525-4325
Phone
(970) 484-4757
Fax
(970) 484-4759
NPI assigned
Apr 11, 2007
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Feb 4, 2026

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

Specialties & licenses 4

Specialty (taxonomy)CodeLicenseStatePrimary
Diagnostic Radiology Physician 2085R0202X CP1792 NE
Diagnostic Radiology Physician 2085R0202X CDR.0006012 CO
Diagnostic Radiology Physician 2085R0202X 18994C WY
Diagnostic Radiology Physician 2085R0202X 036.116382 IL Primary

Addresses

Primary practice location

2008 Caribou Dr
Fort Collins, CO 80525-4325

Mailing address

2008 Caribou Dr
Fort Collins, CO 80525-4325
Phone (970) 484-4757

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in IL, MO, CO3 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 3

Enrollment IDStateProvider typePAC IDDetails
I20070530000055 IL Practitioner - Diagnostic Radiology 1456458314 Reassigns benefits to 1 organization
I20090330000509 MO Practitioner - Diagnostic Radiology 1456458314 Reassigns benefits to 2 organizations
I20260416001413 CO Practitioner - Diagnostic Radiology 1456458314 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Diagnostic Radiology
Education
University of Chicago, Pritzker School of Medicine, 2002
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Uchealth Imaging Services LLCGroup PAC ID 5799021291, 247 clinicians
Fort Collins Radiologic Associates PCGroup PAC ID 7315844396, 63 clinicians
Mercy Hospital PerryGroup PAC ID 1153777826, 115 clinicians

Practice addresses (Care Compare)

100 Cook St
Suite 100
Denver, CO 80206-5327
Phone (720) 516-9420

2805 Carnoustie LN
Quincy, IL 62301-6175
Phone (970) 484-4757

434 N W St
Perryville, MO 63775-1359
Phone (573) 547-2536

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
CDR.0006012COMDDiagnostic Radiology Physician
036.116382ILMDDiagnostic Radiology Physician
CP1792NEMDDiagnostic Radiology Physician
18994CWYMDDiagnostic Radiology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Fort Collins Radiologic Associates PC Diagnostic Radiology CurrentSince Feb 1, 2026 Accepting new patients
Mercy Hospital Perry CurrentSince Oct 1, 2023 Accepting new patients
Mercy Hospital Perry Diagnostic Radiology Current Accepting new patients
Mercy Hospital Perry CurrentSince Oct 1, 2023 Accepting new patients
F&S Radiology, P.C. Diagnostic Radiology Past Accepting new patients
HSHS Holy Family Hospital Inc Past Accepting new patients

Locations

11820 Destination Dr
Broomfield, CO 80021
Phone (303) 460-6000

100 Cook St
Ste 404
Denver, CO 80206
Phone (720) 516-9200

100 Cook St
Ste 100
Denver, CO 80206
Phone (720) 516-9420

100 Cook St
Ste 410
Denver, CO 80206
Phone (720) 516-9420

100 Cook St
Ste 212
Denver, CO 80206
Phone (720) 516-9200

1024 S Lemay Ave
Fort Collins, CO 80524
Phone (970) 495-7000

2008 Caribou Dr
Fort Collins, CO 80525

6767 29th St
Greeley, CO 80634
Phone (970) 652-2000

1750 E Ken Pratt Blvd
Longmont, CO 80504
Phone (720) 718-7000

1760 E Ken Pratt Blvd
Ste 202
Longmont, CO 80504
Phone (720) 718-5200

2500 Rocky Mountain Ave
Loveland, CO 80538
Phone (970) 297-6425

1000 W 8th Ave
Yuma, CO 80759
Phone (970) 345-6336

434 N West St
Perryville, MO 63775
Phone (573) 547-2530

1313 S St
Bridgeport, NE 69336
Phone (308) 262-1616

255 W 4th St
Kimball, NE 69145
Phone (308) 235-1951

1000 Pole Creek Xing
Sidney, NE 69162
Phone (308) 254-5825

255 N 30th St
Laramie, WY 82072
Phone (307) 742-2141

Organizations & group practices 7

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.

Hospital & facility affiliations 9

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

NPI Registry JSON

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

{
    "created_epoch": "1176249600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1770163200000",
    "number": "1952524449",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2008 CARIBOU DR",
            "city": "FORT COLLINS",
            "state": "CO",
            "postal_code": "805254325",
            "telephone_number": "970-484-4757",
            "fax_number": "970-484-4759"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2008 CARIBOU DR",
            "city": "FORT COLLINS",
            "state": "CO",
            "postal_code": "805254325",
            "telephone_number": "970-484-4757",
            "fax_number": "970-484-4759"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FIMMEN",
        "first_name": "DEREK",
        "middle_name": "LEE",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2007-04-11",
        "last_updated": "2026-02-04",
        "certification_date": "2026-02-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "NE",
            "license": "CP1792",
            "primary": false
        },
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "CO",
            "license": "CDR.0006012",
            "primary": false
        },
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "WY",
            "license": "18994C",
            "primary": false
        },
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "IL",
            "license": "036.116382",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Fort Collins, CO

Sources for this page

Verify at the official NPI Registry.