DEREK LEE FIMMEN MD
NPI 1952524449
Radiology - Diagnostic Radiology in Fort Collins, CO
About Derek Lee Fimmen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DEREK LEE FIMMEN MD (NPI 1952524449) is an individual diagnostic radiology provider in Fort Collins, Colorado, licensed in Illinois (036.116382) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS, is affiliated with Memorial Hospital Of Carbondale, and is a graduate of University Of Chicago, Pritzker School Of Medicine (2002).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Derek Lee Fimmen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Derek Fimmen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fort Collins, CO 80525
- Reassigned Medicare billing, Illinois enrollment
Longmont, CO 80504
- Reassigned Medicare billing, Colorado enrollment
- 320 clinicians in this Medicare group
Perryville, MO 63775
- Reassigned Medicare billing, Missouri enrollment
- Also billed through NPI 1063117158 (Missouri)
- 192 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 85
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Memorial Hospital Of Carbondale
Acute Care Hospitals · Carbondale, ILMercy Health - Lourdes Hospital
Acute Care Hospitals · Paducah, KYSaint Francis Medical Center
Acute Care Hospitals · Cape Girardeau, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 80525 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
FORT COLLINS, CO 80525
FORT COLLINS, CO 80525
FORT COLLINS, CO 80525
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Derek Fimmen's NPI number?
The NPI number for Derek Fimmen is 1952524449. It was assigned to this individual provider in the NPPES registry on April 11, 2007.
Where is Derek Fimmen located?
Derek Fimmen practices at 2008 Caribou Dr, Fort Collins, CO 80525. The listed phone number is (970) 484-4757.
What is Derek Fimmen's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is Derek Fimmen enrolled in Medicare?
Yes. Derek Fimmen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Derek Fimmen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Derek Fimmen reassigns Medicare benefits to 3 organizations: Fort Collins Radiologic Associates PC (Fort Collins, CO), Uchealth Imaging Services, LLC (Longmont, CO) and Mercy Hospital Perry (Perryville, MO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Derek Fimmen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Derek Fimmen accept?
Health plans from Blue Cross Blue Shield of Wyoming and Oscar Insurance Company list Derek Fimmen as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Derek Fimmen affiliated with any hospitals?
According to CMS data, Derek Fimmen is affiliated with Memorial Hospital Of Carbondale, Mercy Health - Lourdes Hospital and Saint Francis Medical Center.
When was this NPI record last updated?
The NPPES record for Derek Fimmen was last updated on February 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.