Karen Alderfer, MD
NPI 1043534654 · Diagnostic Radiology Physician · Fort Collins, CO
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Alderfer, MD is a Diagnostic Radiology Physician provider in Fort Collins, CO (NPI 1043534654).
Provider details
- NPI number
- 1043534654
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 14311C (WY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,501 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 302 | $82 |
| Ct Scan of Chest With Contrast71260 | 202 | $50 |
| Ct Scan of Chest Without Contrast71250 | 165 | $49 |
| X-Ray of Chest, 1 View71045 | 104 | $8 |
| Ct Scan of Blood Vessels of Chest With Contrast71275 | 87 | $81 |
| Ct Scan of Abdomen and Pelvis Without Contrast74176 | 80 | $78 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-03-25
- Last updated
- 2025-07-01
- Certified
- 2025-07-01
Frequently asked questions
- What is Karen Alderfer's NPI number?
- Karen Alderfer's National Provider Identifier (NPI) is 1043534654, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Alderfer's specialty?
- Karen Alderfer is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Karen Alderfer located?
- Karen Alderfer's practice location on file with NPPES is 1024 S Lemay Ave, Fort Collins, CO 80524-3929.
- What is Karen Alderfer's phone number?
- The practice phone number listed in the NPPES registry for Karen Alderfer is (970) 484-4757.
- Does Karen Alderfer accept Medicare?
- Karen Alderfer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Alderfer's NPI active?
- Yes — Karen Alderfer's NPI (1043534654) is active in the NPPES registry as of the last update on 2025-07-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.