Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Derek Lee Fimmen, MD

Individual provider Diagnostic Radiology Physician · NPI 1952524449

Derek Lee Fimmen, MD is a Diagnostic Radiology in Fort Collins, Colorado. Graduated from University of Chicago, Pritzker School of Medicine in 2002, 24 years ago. Practices with Fort Collins Radiologic Associates PC, a 65-clinician group and accepts Medicare assignment. Licensed in Colorado, Illinois, Nebraska and Wyoming.

Years since qualifying
24
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
CO, IL, NE, WY
In the registry since
2007
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

2008 Caribou Dr
Fort Collins, CO 80525-4325
Phone: (970) 484-4757
Fax: (970) 484-4759
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence 036.116382 (IL)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence CP1792 (NE)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence CDR.0006012 (CO)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 18994C (WY)

Record details

NPI number1952524449
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 11, 2007
Last updated in NPPESFebruary 4, 2026
Certification dateFebruary 4, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyDIAGNOSTIC RADIOLOGY
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 2002 (24 years in practice)
Group practice Fort Collins Radiologic Associates Pc — 65 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Other providers in Fort Collins