Quick answers
- Does Brennen S. Larsen accept Medicare assignment?
- Yes. Medicare's clinician data says Brennen S. Larsen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Brennen S. Larsen see?
- In 2024, CMS data shows 100 Original Medicare patients and 471 services for Brennen S. Larsen. This counts Original Medicare only and measures volume, not quality.
- What is Brennen S. Larsen's NPI number?
- 1740659010. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Brennen S. Larsen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 100 |
|---|---|
| Services billed to Medicare | 471 |
| Different services or procedures | 46 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)96 services
- Injection of drug or substance under skin or into muscle (96372)48 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)25 services
- Automated urinalysis test (81003)19 services
- Insertion of needle into vein for collection of blood sample (36415)16 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure59%
- Arthritis42%
- High cholesterol41%
- Diabetes24%
- Ischemic heart disease24%
- Atrial fibrillation16%
Hospitals where Brennen S. Larsen works
Medicare's Facility Affiliation Data lists Brennen S. Larsen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Madison Memorial HospitalRexburg, ID · Acute Care Hospital · Emergency services: listed by Medicare · CCN 130025
Practice locations
Addresses where Brennen S. Larsen is enrolled with Medicare (CMS data updated October 2, 2026).
- 2000 Trappers LoopRexburg, ID 83440 (208) 881‑5222
- 21 Winn DrRexburg, ID 83440
Group practices
Medicare enrollment lists Brennen S. Larsen as a member of this group (CMS data updated October 2, 2026).
- Fall River Medical PLLC8 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Rexburg
Clinicians with the same Medicare primary specialty in Rexburg, ID — not a recommendation.
Other clinicians in Fall River Medical PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2015 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1740659010 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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