MARK J STOUT MD
NPI 1851386551
Transplant Surgery in Waukesha, WI
About Mark J Stout Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK J STOUT MD (NPI 1851386551) is an individual transplant surgery provider in Waukesha, Wisconsin, licensed in Wisconsin (62383) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS, is affiliated with Waukesha Memorial Hospital, and is a graduate of Saint Louis University School Of Medicine (1985).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 6
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mark J Stout Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Mark Stout reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Waukesha, WI 53188
- Reassigned Medicare billing, Wisconsin enrollment
- 528 clinicians in this Medicare group
Janesville, WI 53548
- Reassigned Medicare billing, Wisconsin enrollment
- 1,155 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Waukesha Memorial Hospital
Acute Care Hospitals · Waukesha, WIOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WAUKESHA, WI 53188
WAUKESHA, WI 53188
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 Mark Stout's NPI number?
The NPI number for Mark Stout is 1851386551. It was assigned to this individual provider in the NPPES registry on September 19, 2005.
Where is Mark Stout located?
Mark Stout practices at 725 American Ave, Waukesha, WI 53188. The listed phone number is (608) 263-1530.
What is Mark Stout's specialty?
The primary specialty registered for this NPI is Transplant Surgery with taxonomy code 204F00000X.
Is Mark Stout enrolled in Medicare?
Yes. Mark Stout is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Mark Stout's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Stout reassigns Medicare benefits to 2 organizations: Prohealth Medical Group Inc (Waukesha, WI) and Mercy Health System Corporation (Janesville, WI). Each 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 Mark Stout's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Stout accept?
Health plans from Anthem Blue Cross and Blue Shield, CareSource, MercyCare, MercyCare Health Plans and Network Health list Mark Stout as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Mark Stout affiliated with any hospitals?
According to CMS data, Mark Stout is affiliated with Waukesha Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Mark Stout was last updated on May 3, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Mark J Stout, MD · NPI 1851386551
Transplant Surgery physician in Waukesha, Wisconsin. Individual provider, active in the CMS NPPES registry since September 19, 2005.
## Identity
- **NPI:** 1851386551 (Entity type: Individual)
- **Enumerated:** September 19, 2005
- **Primary specialty:** Transplant Surgery · taxonomy 204F00000X
- **State license:** 62383 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 725 AMERICAN AVE, Waukesha, WI 53188-5031
- **Phone:** (608) 263-1530
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Prohealth Medical Group Inc (NPI 1629225677, Waukesha, WI); Mercy Health System Corporation (NPI 1669685129, Janesville, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Saint Louis University School Of Medicine, class of 1985
## Record status
- **NPPES last updated:** May 3, 2021
- **Other identifiers:** Other 000001005823 (IN); Other 780000280 (IL); Other 01605360 (IL); and 3 more
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Source: [NPI Profile](https://npiprofile.com/npi/1851386551) · Data from the CMS NPPES public registry.