Christopher Klassen, M.D., PH.D.
NPI 1336201102 · Diagnostic Radiology Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Klassen, M.D., PH.D. is a Diagnostic Radiology Physician provider in Milwaukee, WI (NPI 1336201102).
Provider details
- NPI number
- 1336201102
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., PH.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 77052 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
3,127 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) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 1,055 | $8 |
| X-Ray of Chest, 2 Views71046 | 424 | $10 |
| X-Ray of Chest, 2 Views71046 | 259 | $15 |
| Ct Scan of Chest Without Contrast71250 | 231 | $60 |
| Ct Scan of Chest Without Contrast71250 | 174 | $48 |
| Ct Scan of Blood Vessels of Chest With Contrast71275 | 162 | $80 |
| X-Ray of Abdomen, 1 View74018 | 86 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-15
- Last updated
- 2022-07-11
- Certified
- 2022-07-11
Frequently asked questions
- What is Christopher Klassen's NPI number?
- Christopher Klassen's National Provider Identifier (NPI) is 1336201102, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Klassen's specialty?
- Christopher Klassen is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Klassen located?
- Christopher Klassen's practice location on file with NPPES is 9200 W Wisconsin Ave, Milwaukee, WI 53226-3522.
- What is Christopher Klassen's phone number?
- The practice phone number listed in the NPPES registry for Christopher Klassen is (414) 805-2060.
- Does Christopher Klassen accept Medicare?
- Christopher Klassen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Klassen's NPI active?
- Yes — Christopher Klassen's NPI (1336201102) is active in the NPPES registry as of the last update on 2022-07-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.