John F. Nielsen, M.D.
Family Medicine Physician · Marinette, WI
John F. Nielsen, M.D. is a family medicine physician with a practice address in Marinette, Wisconsin, and NPI 1003811415, issued on Jun 14, 2005. Check the license (Wisconsin 75212-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- John F. Nielsen
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 75212-20 WI
J8333 TX
Self-reported in NPPES; status is on the state search - Practice location
- 4061 Old Peshtigo RD, Marinette, WI 54143
- Phone
- (715) 732-8050
- Enumerated
- Jun 14, 2005
- Record last updated
- Dec 10, 2024
- Medicaid IDs
- 099875903 TX
100170914 WI - Medicare enrollment
- Enrolled (PECOS I20210624003412); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 4061 Old Peshtigo RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Carrie Anderson, RNDiabetes Educator Registered Nurse1346834744
- Susan Arcaro, DOAnesthesiology Physician1295743862
- Karin Beal, LCSWClinical Social Worker1669008488
- Debora Bensi, MDFamily Medicine Physician1558542332
- Ulysses Boco, MDFamily Medicine Physician1396239372
- Christy Brown, APNPNurse Practitioner1740299387
Verify John F. Nielsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 75212-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average family medicine physician in 2024
3,368 Medicare Part D claims for 288 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 137 claims were for opioids.
Most prescribed
- Atorvastatin Calcium222 claims
- Amlodipine Besylate135 claims
- Losartan Potassium113 claims
- Omeprazole107 claims
- Gabapentin90 claims
- Pantoprazole Sodium80 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 83.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Aurora Medical Group, Inc.Marinette, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John F. Nielsen among 3,765 family medicine physician records in Wisconsin
John F. Nielsen, M.D. 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1987 · 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).
12 family medicine physician records list a practice address in Marinette
They are 12 of the 452 NPPES records with a practice address in Marinette, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Marinette → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Debora Bensi, MDMarinette, WI 541431558542332
- Ulysses Boco, MDMarinette, WI 541431396239372
- Mridani Choudhury, M.D.Marinette, WI 541431275847519
- Christopher Kordiyak, M.D.Marinette, WI 541431174685598
- Tyler Manley, DOMarinette, WI 541431740708361
- Gary Metcalf, MDMarinette, WI 541431831216985
- James Opoien, MD PHDMarinette, WI 541431265429674
- Lara Powers, MDMarinette, WI 541431730176140
Common questions
What is John F. Nielsen, M.D.'s NPI number?
John F. Nielsen, M.D.'s National Provider Identifier (NPI) is 1003811415, issued on Jun 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John F. Nielsen, M.D. located?
The NPPES record lists a practice address at 4061 Old Peshtigo RD, Marinette, WI, 54143. Phone: (715) 732-8050. Providers update this record themselves, so call before visiting.
How can I verify John F. Nielsen, M.D.'s license?
NPPES lists Wisconsin license number 75212-20, 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 John F. Nielsen, M.D. prescribe under Medicare Part D?
In 2024, John F. Nielsen, M.D. had 3,368 Medicare Part D claims for 288 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is John F. Nielsen, M.D.'s MIPS final score?
The 2023 MIPS final score is 83.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.