Joseph Trojan, M.D.
NPI 1225022700 · Internal Medicine Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Trojan, M.D. is a Internal Medicine Physician provider in Milwaukee, WI (NPI 1225022700).
Provider details
- NPI number
- 1225022700
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 26061 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-09
- Last updated
- 2008-11-21
Frequently asked questions
- What is Joseph Trojan's NPI number?
- Joseph Trojan's National Provider Identifier (NPI) is 1225022700, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Trojan's specialty?
- Joseph Trojan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Trojan located?
- Joseph Trojan's practice location on file with NPPES is 2500 W Layton Ave, Milwaukee, WI 53221-5420.
- What is Joseph Trojan's phone number?
- The practice phone number listed in the NPPES registry for Joseph Trojan is (414) 282-2006.
- Does Joseph Trojan accept Medicare?
- Joseph Trojan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Trojan's NPI active?
- Yes — Joseph Trojan's NPI (1225022700) is active in the NPPES registry as of the last update on 2008-11-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.