Nicholas J. Larsen, DO

Medicare activity in 2024

Official CMS public-use data for Nicholas J. 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.

Most frequent services

1. Anesthesia for lens surgery (00142)19 services
2. Anesthesia for other procedure on large bowel using an endoscope (00811)12 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 pressure70%
• High cholesterol67%
• Arthritis52%
• Ischemic heart disease32%
• Chronic kidney disease28%
• Diabetes25%

Hospitals where Nicholas J. Larsen works

Medicare's Facility Affiliation Data lists Nicholas J. 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.

• Benefis Hospitals IncGreat Falls, MT · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 270012
• Mercy Medical CenterRoseburg, OR · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 380027

Practice locations

Addresses where Nicholas J. Larsen is enrolled with Medicare (CMS data updated October 2, 2026).

• 1101 26th St SGreat Falls, MT 59405 (406) 455‑5000
• 1111 6th AveDes Moines, IA 50314 (515) 247‑3121
• 1401 25th St SGreat Falls, MT 59405 (406) 455‑5000
• 1755 59th PlWest Des Moines, IA 50266 (515) 358‑8000
• 2700 NW Stewart PkwyRoseburg, OR 97471 (541) 673‑0611

Group practices

Medicare enrollment lists Nicholas J. Larsen as a member of these groups (CMS data updated October 2, 2026).

• Cep America - Anesthesia PC849 clinicians in the group
• Benefis Hospitals Inc384 clinicians in the group

Specialties

• Anesthesiologyprimary

Find other Anesthesiology doctors in Montana →

Other anesthesiologists in Great Falls

Clinicians with the same Medicare primary specialty in Great Falls, MT — not a recommendation.

• Mitchell S. McKamey, DO
• Travis J. Boud, DO
• Clayton Killpack, MD
• Nicholas K. Ford, DO
• Collette Jones, MD
• Gregory Kearby, DO
• John E. Venditti, DO
• Bryce McBride, DO

All anesthesiologists in Great Falls →

Other clinicians in Cep America - Anesthesia PC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Adam J. Dziuba, MD
• Andrew L. Leinweber, MD
• Stephanie Rauch, CNA
• Greg Stratmann, MD
• Anhtu H. La, MD
• Poornima Paramesh, MD

Clinician information

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

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians