JOSEPH G. TROJAN M.D.
NPI 1225022700
Internal Medicine in Milwaukee, WI
About Joseph G. Trojan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOSEPH G. TROJAN M.D. (NPI 1225022700) is an individual internal medicine provider in Milwaukee, Wisconsin, licensed in Wisconsin (26061) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 5
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Joseph G. Trojan M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Joseph Trojan reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Milwaukee, WI 53211
- Reassigned Medicare billing, Wisconsin enrollment
- 1,343 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53221 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MILWAUKEE, WI 53221
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Joseph Trojan's NPI number?
The NPI number for Joseph Trojan is 1225022700. It was assigned to this individual provider in the NPPES registry on September 9, 2005.
Where is Joseph Trojan located?
Joseph Trojan practices at 2500 W Layton Ave Suite 10, Milwaukee, WI 53221. The listed phone number is (414) 282-2006.
What is Joseph Trojan's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Joseph Trojan enrolled in Medicare?
Yes. Joseph Trojan is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Joseph Trojan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Joseph Trojan reassigns Medicare benefits to Ascension Medical Group-Southeast Wisconsin Inc (Milwaukee, WI). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Joseph Trojan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Joseph Trojan was last updated on November 21, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Joseph G. Trojan, M.D. · NPI 1225022700
Internal Medicine physician in Milwaukee, Wisconsin. Individual provider, active in the CMS NPPES registry since September 9, 2005.
## Identity
- **NPI:** 1225022700 (Entity type: Individual)
- **Enumerated:** September 9, 2005
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 26061 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 2500 W LAYTON AVE, SUITE 10, Milwaukee, WI 53221-5420
- **Phone:** (414) 282-2006 · **Fax:** (414) 281-8704
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Ascension Medical Group-Southeast Wisconsin Inc (NPI 1194473066, Milwaukee, WI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** November 21, 2008
- **Other identifiers:** Medicare OSCAR/certification 051373840 (WI); Medicare ID-Type Unspecified 0008-02475 (WI); Medicaid 30738300 (WI); and 2 more
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Source: [NPI Profile](https://npiprofile.com/npi/1225022700) · Data from the CMS NPPES public registry.