Katherine Ellen Marienfeld, M.D.
Internal Medicine Physician · Keshena, WI
Katherine Ellen Marienfeld, M.D. is an internal medicine physician with a practice address in Keshena, Wisconsin, and NPI 1689850349, issued on Jan 11, 2008. Check the license (Wisconsin 51922-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Katherine Ellen Marienfeld
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 51922-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- W 3275 Wolf River Drive, Keshena, WI 54135
- Phone
- (715) 799-3361
- Enumerated
- Jan 11, 2008
- Record last updated
- Dec 17, 2009 (not updated in 17 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
Verify Katherine Ellen Marienfeld in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 51922-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
40 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
1 internal medicine physician records list a practice address in Keshena
They are 1 of the 58 NPPES records with a practice address in Keshena, and 2,078 internal medicine physician records in Wisconsin.
Other internal medicine physician records in Wisconsin
- Sheetal Aatrai, MDMarshfield, WI1417568965
- Khalid Abdelgadir, MDManitowoc, WI1407433295
- Mesfin Abdissa, MDMilwaukee, WI1376579417
- Anas Abed, MDMadison, WI1659002566
- Margaret Abel, MDRhinelander, WI1477590487
- Mesfin Abera, M.D.Beaver Dam, WI1972852390
- Vidthya Abraham, M.D.Madison, WI1861836058
- Ismael Abu Limon, MDGreenfield, WI1467945543
- Amjed Abu Muhanna, MDMarinette, WI1861514135
- Satish Achanti, MDAppleton, WI1982711198
Common questions
What is Katherine Ellen Marienfeld, M.D.'s NPI number?
Katherine Ellen Marienfeld, M.D.'s National Provider Identifier (NPI) is 1689850349, issued on Jan 11, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Ellen Marienfeld, M.D. located?
The NPPES record lists a practice address at W 3275 Wolf River Drive, Keshena, WI, 54135. Phone: (715) 799-3361. Providers update this record themselves, so call before visiting.
How can I verify Katherine Ellen Marienfeld, M.D.'s license?
NPPES lists Wisconsin license number 51922-020, 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 Katherine Ellen Marienfeld, M.D. prescribe under Medicare Part D?
In 2024, Katherine Ellen Marienfeld, M.D. had 40 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.