Ammon J. Larsen, MD

Medicare activity in 2024

Official CMS public-use data for Ammon 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. Destruction of precancer skin growth, 2-14 growths (17003)1,694 services
2. Destruction of precancer skin growth, 1 growth (17000)692 services
3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)593 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)522 services
5. Biopsy of related skin growth, first growth (11102)290 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 cholesterol64%
• High blood pressure60%
• Arthritis46%
• Ischemic heart disease19%
• Chronic kidney disease19%
• Diabetes18%

Hospitals where Ammon J. Larsen works

Medicare's Facility Affiliation Data lists Ammon 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.

• Medical Center of the RockiesLoveland, CO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 060119
• Sterling Regional MedcenterSterling, CO · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 060076

Practice locations

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

• 1405 S 8th Ave, Suite 102Sterling, CO 80751 (970) 800‑9330
• 3451 Mountain Lion DrLoveland, CO 80537 (970) 800‑9330

Group practices

Medicare enrollment lists Ammon J. Larsen as a member of this group (CMS data updated October 2, 2026).

• Monarch Dermatology and Surgery LLC6 clinicians in the group

Specialties

• Dermatologyprimary

Find other Dermatology doctors in Colorado →

Other dermatologists in Colorado

Clinicians with the same Medicare primary specialty in Colorado — not a recommendation.

• Holly H. McCoppin, MD
• Sarah A. Basak, MD
• Ginger S. Mentz, MD
• Michael E. Contreras, MD
• Joshua W. Schimmel, MD
• Renata M. Raziano, MD
• Anna M. Zanot, MD
• Jamie G. Surovik, MD

All dermatologists in Colorado →

Other clinicians in Monarch Dermatology and Surgery LLC

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

• Erika L. Tokuyama, PA
• Julia Wortham, PA
• Holly H. McCoppin, 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