Alexander K. Larson, MD
Gastroenterology Physician · Madison, WI
Alexander K. Larson, MD is a gastroenterology physician with a practice address in Madison, Wisconsin, and NPI 1124349337, issued on Jun 22, 2010. Check the license (Wisconsin 66867-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Alexander K. Larson
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 66867-20 WI
Self-reported in NPPES; status is on the state search - Practice location
- 700 S Park St, Madison, WI 53715
- Phone
- (608) 260-2900
- Enumerated
- Jun 22, 2010
- Record last updated
- Dec 4, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (608) 260-2977
- Medicaid ID
- 1124349337 WI
- Medicare enrollment
- Enrolled (PECOS I20170814001351); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 340 in Wisconsin → Look up another NPI →
Also registered at 700 S Park St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Clark Albert, MDAnesthesiology Physician1457300634
- Michael Allan, MDGastroenterology Physician1558300822
- Shane Allen, M.D.Emergency Medicine Physician1649478231
Verify Alexander K. Larson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 66867-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% fewer Medicare Part D claims than the average gastroenterology physician in 2024
644 Medicare Part D claims for 381 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Gavilyte-C261 claims
- Pantoprazole Sodium55 claims
- Omeprazole37 claims
- Linzess32 claims
- Gavilyte-G23 claims
- Metoclopramide Hcl22 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
- Dean Health Systems IncMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexander K. Larson among 340 gastroenterology physician records in Wisconsin
Alexander K. Larson, MD is one of 340 gastroenterology physician records with a practice address in Wisconsin. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 70% of them.
- NPI issued2010 · 70% of these records are older, 28% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2010 · median 2003 among the 239 with a school on file
- Record last updated2020 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Wisconsin
There are 340 gastroenterology physician records in Wisconsin.
All 340 in Wisconsin → Every provider in Madison → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Michael Allan, MDMadison, WI 537151558300822
- Siobhan Byrne, M.D.Madison, WI 537151417915836
- Abigail Christiansen, MDMadison, WI 537151427003227
- Sigurdur Einarsson, MDMadison, WI 537151245206317
- Jason Gonzaga, M.D.Madison, WI 537151710026430
- Gary Griglione, MDMadison, WI 537151013931203
- John Hamilton, MDMadison, WI 537151659310969
- Susan Lepinski, MDMadison, WI 537151780650713
Common questions
What is Alexander K. Larson, MD's NPI number?
Alexander K. Larson, MD's National Provider Identifier (NPI) is 1124349337, issued on Jun 22, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Alexander K. Larson, MD located?
The NPPES record lists a practice address at 700 S Park St, Madison, WI, 53715. Phone: (608) 260-2900. Providers update this record themselves, so call before visiting.
How can I verify Alexander K. Larson, MD's license?
NPPES lists Wisconsin license number 66867-20, 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 Alexander K. Larson, MD prescribe under Medicare Part D?
In 2024, Alexander K. Larson, MD had 644 Medicare Part D claims for 381 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.