Alexander Larson, MD
NPI 1124349337 · Gastroenterology Physician · Madison, WI
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Larson, MD is a Gastroenterology Physician provider in Madison, WI (NPI 1124349337).
Provider details
- NPI number
- 1124349337
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 66867-20 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
651 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Moderate Sedation Services Provided By the Same Physician Or Other Qualified Health Care Professional Performing a Gastrointestinal Endoscopic Service That Sedation Supports, Requiring the Presence of an Independent Trained Observer to Assist in the MonitoG0500 | 125 | $5 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 105 | $227 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 59 | $71 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 42 | $45 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 40 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 261 | 257 |
| Pantoprazole Sodium | 55 | 16 |
| Omeprazole | 37 | 14 |
| Linaclotidebrand: Linzess | 32 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 23 | 23 |
| Metoclopramide Hcl | 22 | — |
| Famotidine | 21 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-06-22
- Last updated
- 2020-12-04
- Certified
- 2020-12-04
Frequently asked questions
- What is Alexander Larson's NPI number?
- Alexander Larson's National Provider Identifier (NPI) is 1124349337, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Larson's specialty?
- Alexander Larson is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Larson located?
- Alexander Larson's practice location on file with NPPES is 700 S Park St, Madison, WI 53715-1830.
- What is Alexander Larson's phone number?
- The practice phone number listed in the NPPES registry for Alexander Larson is (608) 260-2900.
- Does Alexander Larson accept Medicare?
- Alexander Larson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Larson's NPI active?
- Yes — Alexander Larson's NPI (1124349337) is active in the NPPES registry as of the last update on 2020-12-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.