Mark Niedfeldt, MD
NPI 1205887775 · Family Medicine Physician · Mequon, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Niedfeldt, MD is a Family Medicine Physician provider in Mequon, WI (NPI 1205887775).
Provider details
- NPI number
- 1205887775
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 35201 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Alprazolam | 40 | — |
| Atorvastatin Calcium | 37 | — |
| Rosuvastatin Calcium | 32 | 11 |
| Escitalopram Oxalate | 23 | — |
| Allopurinol | 23 | — |
| Tramadol Hcl | 23 | — |
| Tirzepatidebrand: Mounjaro |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-12
- Last updated
- 2024-09-24
- Certified
- 2024-09-24
Frequently asked questions
- What is Mark Niedfeldt's NPI number?
- Mark Niedfeldt's National Provider Identifier (NPI) is 1205887775, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Niedfeldt's specialty?
- Mark Niedfeldt is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Niedfeldt located?
- Mark Niedfeldt's practice location on file with NPPES is 10325 N Port Washington Rd Ste 150, Mequon, WI 53092-5768.
- What is Mark Niedfeldt's phone number?
- The practice phone number listed in the NPPES registry for Mark Niedfeldt is (262) 643-4720.
- Does Mark Niedfeldt accept Medicare?
- Mark Niedfeldt is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Niedfeldt's NPI active?
- Yes — Mark Niedfeldt's NPI (1205887775) is active in the NPPES registry as of the last update on 2024-09-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.