DR. MARK W NIEDFELDT MD
NPI 1205887775
Family Medicine in Mequon, WI
About Dr. Mark W Niedfeldt Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK W NIEDFELDT MD (NPI 1205887775) is an individual family medicine provider in Mequon, Wisconsin, licensed in Wisconsin (35201) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS, is affiliated with Froedtert Memorial Lutheran Hospital, and is a graduate of Medical College Of Wisconsin (1988).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
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
Dr. Mark W Niedfeldt 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 Reassignment
Medicare enrollment records show Mark Niedfeldt reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Mequon, WI 53092
- Reassigned Medicare billing, Wisconsin enrollment
- 2 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Froedtert Memorial Lutheran Hospital
Acute Care Hospitals · Milwaukee, WIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 53092 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Niedfeldt's NPI number?
The NPI number for Mark Niedfeldt is 1205887775. It was assigned to this individual provider in the NPPES registry on May 12, 2006.
Where is Mark Niedfeldt located?
Mark Niedfeldt practices at 10325 N Port Washington Rd Ste 150, Mequon, WI 53092. The listed phone number is (262) 643-4720.
What is Mark Niedfeldt's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Mark Niedfeldt enrolled in Medicare?
Yes. Mark Niedfeldt 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 organization bills Medicare for Mark Niedfeldt's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Niedfeldt reassigns Medicare benefits to Colab Physicians, Sc (Mequon, 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 Mark Niedfeldt's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Niedfeldt accept?
Health plans from CareSource (Common Ground Healthcare) list Mark Niedfeldt 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 Niedfeldt affiliated with any hospitals?
According to CMS data, Mark Niedfeldt is affiliated with Froedtert Memorial Lutheran Hospital.
When was this NPI record last updated?
The NPPES record for Mark Niedfeldt was last updated on September 24, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Dr. Mark W Niedfeldt, MD · NPI 1205887775
Family Medicine physician in Mequon, Wisconsin. Individual provider, active in the CMS NPPES registry since May 12, 2006.
## Identity
- **NPI:** 1205887775 (Entity type: Individual)
- **Enumerated:** May 12, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 35201 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 10325 N PORT WASHINGTON RD STE 150, Mequon, WI 53092-5768
- **Phone:** (262) 643-4720 · **Fax:** (262) 643-4721
## 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:** Colab Physicians, Sc (NPI 1902666035, Mequon, WI), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Medical College Of Wisconsin, class of 1988
## Record status
- **NPPES last updated:** September 24, 2024
- **Other identifiers:** Medicaid 32113600 (WI); Other 002000187C
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Source: [NPI Profile](https://npiprofile.com/npi/1205887775) · Data from the CMS NPPES public registry.