Margaret M. Grenisen, MD
Family Medicine Physician · La Crosse, WI
Margaret M. Grenisen, MD is a family medicine physician with a practice address in La Crosse, Wisconsin, and NPI 1447231766, issued on Nov 14, 2005. Check the license (Wisconsin 32890, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Margaret M. Grenisen
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 32890 WI
Self-reported in NPPES; status is on the state search - Practice location
- 800 West Ave S, La Crosse, WI 54601
- Phone
- (608) 392-9891
- Enumerated
- Nov 14, 2005
- Record last updated
- Jun 15, 2026
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 800 West Ave S
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Stephanie Andersen, OTROccupational Therapist1386773125
- Daniel Anderson, D.O.Neurology Physician1770996340
- Nitika Arora, M.D.Ophthalmology Physician1629419031
Verify Margaret M. Grenisen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 32890Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family medicine physician in 2024
156 Medicare Part D claims for 33 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Mounjaro39 claims
- Topiramate39 claims
- Ozempic21 claims
- Wegovy13 claims
- Metformin Hcl Er12 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.
Margaret M. Grenisen among 3,765 family medicine physician records in Wisconsin
Margaret M. Grenisen, 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 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 fileNo · 62% of these records are
- Record last updated2026 · 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).
115 family medicine physician records list a practice address in La Crosse
They are 115 of the 3,735 NPPES records with a practice address in La Crosse, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in La Crosse → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Karl Borge, MDLa Crosse, WI 546011831193507
- Robyn Borge, MDLa Crosse, WI 546011528062296
- Craig Carr, MDLa Crosse, WI 546011780689190
- Karen Cowan, MDLa Crosse, WI 546011417951856
- Scott Escher, MDLa Crosse, WI 546011700881877
- Thomas Frisby, MDLa Crosse, WI 546011417952359
- Erik Gundersen, MDLa Crosse, WI 546011770588360
- Cheng Her, MDLa Crosse, WI 546011356346803
Common questions
What is Margaret M. Grenisen, MD's NPI number?
Margaret M. Grenisen, MD's National Provider Identifier (NPI) is 1447231766, issued on Nov 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Margaret M. Grenisen, MD located?
The NPPES record lists a practice address at 800 West Ave S, La Crosse, WI, 54601. Phone: (608) 392-9891. Providers update this record themselves, so call before visiting.
How can I verify Margaret M. Grenisen, MD's license?
NPPES lists Wisconsin license number 32890, 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 Margaret M. Grenisen, MD prescribe under Medicare Part D?
In 2024, Margaret M. Grenisen, MD had 156 Medicare Part D claims for 33 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.