Nathan Michael Larsen, M.D.
Emergency Medicine Physician · Waupaca, WI
Nathan Michael Larsen, M.D. is an emergency medicine physician with a practice address in Waupaca, Wisconsin, and NPI 1992887848, issued on Oct 19, 2006. Check the license (Wisconsin 48825-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Nathan Michael Larsen
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 48825-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 800 Riverside Dr, Waupaca, WI 54981
- Phone
- (715) 258-1000
- Enumerated
- Oct 19, 2006
- Record last updated
- Nov 17, 2022
- Fax
- (715) 258-2000
- Medicare enrollment
- Enrolled (PECOS I20070618000165); accepts Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2004
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,464 in Wisconsin → Look up another NPI →
Also registered at 800 Riverside Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anita AhlbornRegistered Respiratory Therapist1639068711
- Syed Ala, MDHospitalist Physician1235233792
- Rachel Badtke, OTD, OTR/LOccupational Therapist1184513236
- Jennifer Bahr, M.D.Emergency Medicine Physician1336315324
- Mandip Bartels, M.D.Internal Medicine Physician1477569275
- Zachary Bartz, DPTPhysical Therapist1639797541
Verify Nathan Michael Larsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 48825-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% more Medicare Part D claims than the average emergency medicine physician in 2024
268 Medicare Part D claims for 189 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 39 claims were for opioids.
Most prescribed
- Prednisone37 claims
- Hydrocodone-Acetaminophen31 claims
- Ondansetron Odt17 claims
- Cephalexin16 claims
- Ciprofloxacin Hcl14 claims
- Azithromycin12 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
- Thedacare Regional Medical Center - Appleton, IncFond Du Lac, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan Michael Larsen among 1,464 emergency medicine physician records in Wisconsin
Nathan Michael Larsen, M.D. is one of 1,464 emergency medicine physician records with a practice address in Wisconsin. 79% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2004 · median 2011 among the 844 with a school on file
- Record last updated2022 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
23 emergency medicine physician records list a practice address in Waupaca
They are 23 of the 283 NPPES records with a practice address in Waupaca, and 1,464 emergency medicine physician records in Wisconsin.
All 1,464 in Wisconsin → Every provider in Waupaca → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Jennifer Bahr, M.D.Waupaca, WI 549811336315324
- Dale Bertram, MDWaupaca, WI 549811871550970
- Charles Conger, MDWaupaca, WI 549811811904287
- Ismail Dania, MDWaupaca, WI 549811255326070
- Francesca Detrana, DOWaupaca, WI 549811376553420
- Dennis Ford, MDWaupaca, WI 549811811078777
- Gert Hasselhof, MDWaupaca, WI 549811043289473
- Amy Kenworthy, MDWaupaca, WI 549811346335254
Common questions
What is Nathan Michael Larsen, M.D.'s NPI number?
Nathan Michael Larsen, M.D.'s National Provider Identifier (NPI) is 1992887848, issued on Oct 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Michael Larsen, M.D. located?
The NPPES record lists a practice address at 800 Riverside Dr, Waupaca, WI, 54981. Phone: (715) 258-1000. Providers update this record themselves, so call before visiting.
How can I verify Nathan Michael Larsen, M.D.'s license?
NPPES lists Wisconsin license number 48825-020, 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 Nathan Michael Larsen, M.D. prescribe under Medicare Part D?
In 2024, Nathan Michael Larsen, M.D. had 268 Medicare Part D claims for 189 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.