Katherine Ann Larson, MD
Internal Medicine Physician · Prairie Du Sac, WI
Katherine Ann Larson, MD is an internal medicine physician with a practice address in Prairie Du Sac, Wisconsin, and NPI 1417393661, issued on May 15, 2013. Check the license on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Katherine Ann Larson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 10120990-1205 UT
65486 MN
Self-reported in NPPES; status is on the state search - Practice location
- 260 26TH St, Prairie Du Sac, WI 53578
- Phone
- (608) 643-3311
- Enumerated
- May 15, 2013
- Record last updated
- Mar 24, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (608) 643-8600
- Medicare enrollment
- Enrolled (PECOS I20190905002329); accepts Medicare assignment
- Medical or professional school
- Wright State University Boonshoft School Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 260 26TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jessica Armbruster, APSWSocial Worker1730595075
- James Armstrong, NPNurse Practitioner1477518140
- Teresa Bare-InmanPhysical Therapy Assistant1780249243
- Laura Bixby, APNPFamily Nurse Practitioner1508520123
- Kelsey Brady, MSW, LCSWClinical Social Worker1902390768
- Sandra Carroll, CRNACertified Registered Nurse Anesthetist1952086944
Verify Katherine Ann Larson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average internal medicine physician in 2024
654 Medicare Part D claims for 157 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 35 claims were for opioids.
Most prescribed
- Eliquis53 claims
- Cefdinir28 claims
- Lisinopril28 claims
- Prednisone26 claims
- Furosemide25 claims
- Amoxicillin-Clavulanate Potass23 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.
One hospital affiliation
- Olmsted Medical CenterRochester, MN · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Katherine Ann Larson among 2,078 internal medicine physician records in Wisconsin
Katherine Ann Larson, MD is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 70% of them.
- NPI issued2013 · 70% of these records are older, 28% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2013 · median 2002 among the 1,098 with a school on file
- Record last updated2021 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 internal medicine physician records list a practice address in Prairie Du Sac
They are 3 of the 156 NPPES records with a practice address in Prairie Du Sac, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Prairie Du Sac → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Wendy Ledesma, MDPrairie Du Sac, WI 535781457538274
- Sandhya Shah, MDPrairie Du Sac, WI 535781114921046
- Dale Sinnett, MDRichland Center, WI 535811952302614
- Kenneth Israel, MDMt Horeb, WI 535721508832510
- Guirish Agni, MDStoughton, WI 535891356395552
- Joyce Brehm, MDStoughton, WI 535891073567285
- Ahsan Khalid, MDStoughton, WI 535891043286057
- Katelyn Peters, MDStoughton, WI 535891548898182
Common questions
What is Katherine Ann Larson, MD's NPI number?
Katherine Ann Larson, MD's National Provider Identifier (NPI) is 1417393661, issued on May 15, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Ann Larson, MD located?
The NPPES record lists a practice address at 260 26TH St, Prairie Du Sac, WI, 53578. Phone: (608) 643-3311. Providers update this record themselves, so call before visiting.
How can I verify Katherine Ann Larson, MD's license?
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 Ann Larson, MD prescribe under Medicare Part D?
In 2024, Katherine Ann Larson, MD had 654 Medicare Part D claims for 157 beneficiaries; 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.