Michael O'Brien, M.D.
NPI 1194777888 · Diagnostic Radiology Physician · Waukesha, WI
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael O'Brien, M.D. is a Diagnostic Radiology Physician provider in Waukesha, WI (NPI 1194777888).
Provider details
- NPI number
- 1194777888
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 48359 (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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,730 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 | 292 | $8 |
| Ct Scan Head Or Brain Without Contrast70450 | 131 | $37 |
| Mri Scan of Leg Joint Without Contrast73721 | 88 | $60 |
| X-Ray of Knee, 1-2 Views73560 | 83 | $8 |
| X-Ray of Pelvis, 1-2 Views72170 | 65 | $8 |
| X-Ray of Hip, 2-3 Views73502 | 64 | $10 |
| Mri Scan of Arm Joint Without Contrast73221 |
Practice location
Mailing address
Additional practice locations (1)
- 10945 N Port Washington Rd Ste 201Mequon, WI 53092-5078Phone: (262) 292-3151
Registry dates
- Enumerated
- 2006-05-17
- Last updated
- 2024-12-30
- Certified
- 2024-12-30
Frequently asked questions
- What is Michael O'Brien's NPI number?
- Michael O'Brien's National Provider Identifier (NPI) is 1194777888, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael O'Brien's specialty?
- Michael O'Brien is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael O'Brien located?
- Michael O'Brien's practice location on file with NPPES is W231n1440 Corporate Ct, Waukesha, WI 53186-1303.
- What is Michael O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Michael O'Brien is (262) 896-6000.
- Does Michael O'Brien accept Medicare?
- Michael O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael O'Brien's NPI active?
- Yes — Michael O'Brien's NPI (1194777888) is active in the NPPES registry as of the last update on 2024-12-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.