Mark Larson, M.D.
NPI 1316910300 · Gastroenterology Physician · Rochester, MN
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Larson, M.D. is a Gastroenterology Physician provider in Rochester, MN (NPI 1316910300).
Provider details
- NPI number
- 1316910300
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 28083 (MN)
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
20 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
174 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) |
|---|---|---|
| Diagnostic Exam of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43235 | 41 | $103 |
| 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 | 29 | $5 |
| Diagnostic Exam of Large Bowel Using a Flexible Endoscope45378 | 27 | $169 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 25 | $237 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 21 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-09
- Last updated
- 2020-08-18
- Certified
- 2020-08-18
Frequently asked questions
- What is Mark Larson's NPI number?
- Mark Larson's National Provider Identifier (NPI) is 1316910300, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Larson's specialty?
- Mark Larson is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Larson located?
- Mark Larson's practice location on file with NPPES is 200 1st St Sw, Rochester, MN 55905-0001.
- What is Mark Larson's phone number?
- The practice phone number listed in the NPPES registry for Mark Larson is (507) 284-2511.
- Does Mark Larson accept Medicare?
- Mark Larson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Larson's NPI active?
- Yes — Mark Larson's NPI (1316910300) is active in the NPPES registry as of the last update on 2020-08-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.