Stephen Johnston, M.D.
NPI 1255759189 · Diagnostic Radiology Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Johnston, M.D. is a Diagnostic Radiology Physician provider in Milwaukee, WI (NPI 1255759189).
Provider details
- NPI number
- 1255759189
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 66599-20 (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
12 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
3,762 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 | 322 | $8 |
| Screening 3d Breast Mammography77063 | 266 | $26 |
| Screening Mammography77067 | 266 | $33 |
| Ct Scan Head Or Brain Without Contrast70450 | 157 | $36 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 157 | $79 |
| X-Ray of Lower and Sacral Spine, 2-3 Views72100 | 128 | $10 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-03-28
- Last updated
- 2019-06-17
Frequently asked questions
- What is Stephen Johnston's NPI number?
- Stephen Johnston's National Provider Identifier (NPI) is 1255759189, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Johnston's specialty?
- Stephen Johnston is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Johnston located?
- Stephen Johnston's practice location on file with NPPES is 9200 W Wisconsin Ave, Milwaukee, WI 53226.
- What is Stephen Johnston's phone number?
- The practice phone number listed in the NPPES registry for Stephen Johnston is (414) 955-1187.
- Does Stephen Johnston accept Medicare?
- Stephen Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Johnston's NPI active?
- Yes — Stephen Johnston's NPI (1255759189) is active in the NPPES registry as of the last update on 2019-06-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.