Mark W. Niedfeldt, MD
Family Medicine Physician · Mequon, WI
Mark W. Niedfeldt, MD is a family medicine physician with a practice address in Mequon, Wisconsin, and NPI 1205887775, issued on May 12, 2006. Check the license (Wisconsin 35201, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Mark W. Niedfeldt
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 35201 WI
Self-reported in NPPES; status is on the state search - Practice location
- 10325 N Port Washington RD Ste 150, Mequon, WI 53092
- Phone
- (262) 643-4720
- Enumerated
- May 12, 2006
- Record last updated
- Sep 24, 2024
- Fax
- (262) 643-4721
- Medicaid ID
- 32113600 WI
- Medicare enrollment
- Enrolled (PECOS I20040820000961); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 1988
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Verify Mark W. Niedfeldt in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 35201Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average family medicine physician in 2024
656 Medicare Part D claims for 51 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 30 claims were for opioids.
Most prescribed
- Alprazolam40 claims
- Atorvastatin Calcium37 claims
- Rosuvastatin Calcium32 claims
- Allopurinol23 claims
- Escitalopram Oxalate23 claims
- Tramadol Hcl23 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Colab Physicians, SCMequon, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark W. Niedfeldt among 3,765 family medicine physician records in Wisconsin
Mark W. Niedfeldt, MD is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1988 · median 2007 among the 2,347 with a school on file
- Record last updated2024 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
26 family medicine physician records list a practice address in Mequon
They are 26 of the 1,048 NPPES records with a practice address in Mequon, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Mequon → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Nicola Charlton, M.D.Mequon, WI 530921326050436
- Robert Frank, MDMequon, WI 530921659303899
- Michael Gerard, MDMequon, WI 530921598742652
- Richard Lewis, M.D.Mequon, WI 530921306819305
- Gary Lewis, MDThiensville, WI 530921194762765
- Paul Mankus, MDMequon, WI 530921639131998
- Anne Mattson, MDMequon, WI 530921598799496
- Larisa Mazur, MDThiensville, WI 530921861565202
Common questions
What is Mark W. Niedfeldt, MD's NPI number?
Mark W. Niedfeldt, MD's National Provider Identifier (NPI) is 1205887775, issued on May 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark W. Niedfeldt, MD located?
The NPPES record lists a practice address at 10325 N Port Washington RD Ste 150, Mequon, WI, 53092. Phone: (262) 643-4720. Providers update this record themselves, so call before visiting.
How can I verify Mark W. Niedfeldt, MD's license?
NPPES lists Wisconsin license number 35201, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark W. Niedfeldt, MD prescribe under Medicare Part D?
In 2024, Mark W. Niedfeldt, MD had 656 Medicare Part D claims for 51 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.