Quick answers
- Which hospitals does Alexander K. Larson work at?
- Medicare's official clinician data lists Alexander K. Larson at 4 hospitals: Fort Memorial Hospital, SSM Health St Clare Hospital - Baraboo, SSM Health St Mary's Hospital - Madison and Stoughton Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Alexander K. Larson see patients?
- Medicare's clinician data lists 2 practice locations, including Janesville, WI and Madison, WI. Call before your visit to confirm the address.
- What is Alexander K. Larson's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Alexander K. Larson accept Medicare assignment?
- Yes. Medicare's clinician data says Alexander K. Larson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Alexander K. Larson?
- (608) 371-8000, as listed in official Medicare / NPI Registry data.
- What is Alexander K. Larson's NPI number?
- 1124349337. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alexander K. Larson works
Medicare's Facility Affiliation Data lists Alexander K. Larson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Fort Memorial HospitalFort Atkinson, WI · Acute Care Hospital · CCN 520071
- SSM Health St Clare Hospital - BarabooBaraboo, WI · Acute Care Hospital · CCN 520057
- SSM Health St Mary's Hospital - MadisonMadison, WI · Acute Care Hospital · CCN 520083
- Stoughton HospitalStoughton, WI · Critical Access Hospital · CCN 521343
Practice locations
Addresses where Alexander K. Larson is enrolled with Medicare (CMS data updated 2026-10-02).
- 3200 E Racine StJanesville, WI 53546 (608) 371‑8000
- 700 S Park StMadison, WI 53715 (608) 251‑6100
Group practices
Medicare enrollment lists Alexander K. Larson as a member of this group (CMS data updated 2026-10-02).
- Dean Health Systems Inc1,159 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Janesville
Clinicians with the same Medicare primary specialty in Janesville, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1124349337 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians