Mark Stout, MD
NPI 1851386551 · Transplant Surgery Physician · Waukesha, WI
Enrolled with Medicare as Practitioner - Cardiac Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Stout, MD is a Transplant Surgery Physician provider in Waukesha, WI (NPI 1851386551).
Provider details
- NPI number
- 1851386551
- Entity type
- Individual
- Primary specialty
- Transplant Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 01069517A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
12 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Replacement of Aortic Valve Through the Skin and Femoral Artery33361 | 12 | $647 |
Typical Medicare-allowed amounts for these services range $647–$647 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$436 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-19
- Last updated
- 2021-05-03
- Certified
- 2021-05-03
Frequently asked questions
- What is Mark Stout's NPI number?
- Mark Stout's National Provider Identifier (NPI) is 1851386551, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Stout's specialty?
- Mark Stout is listed in the NPPES registry with a primary specialty of Transplant Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Stout located?
- Mark Stout's practice location on file with NPPES is 725 American Ave, Waukesha, WI 53188-5031.
- What is Mark Stout's phone number?
- The practice phone number listed in the NPPES registry for Mark Stout is (608) 263-1530.
- Does Mark Stout accept Medicare?
- Mark Stout is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Stout's NPI active?
- Yes — Mark Stout's NPI (1851386551) is active in the NPPES registry as of the last update on 2021-05-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.