Leonard H. Armstrong, MD

Medicare activity in 2024

Official CMS public-use data for Leonard H. Armstrong, 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. 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 monito (G0500)115 services
2. Biopsy of large bowel using a flexible endoscope (45380)106 services
3. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)64 services
4. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)37 services
5. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)24 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 cholesterol75%
• High blood pressure68%
• Arthritis40%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)28%
• Anxiety25%
• Diabetes23%

Hospitals where Leonard H. Armstrong works

Medicare's Facility Affiliation Data lists Leonard H. Armstrong 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.

• Regions HospitalSaint Paul, MN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 240106

Practice locations

Addresses where Leonard H. Armstrong is enrolled with Medicare (CMS data updated October 2, 2026).

• 15350 English AveApple Valley, MN 55124 (952) 431‑8500
• 401 Phalen BlvdSaint Paul, MN 55130 (651) 254‑7400

Group practices

Medicare enrollment lists Leonard H. Armstrong as a member of this group (CMS data updated October 2, 2026).

• Group Health Inc1,638 clinicians in the group

Specialties

• General Surgeryprimary
• Colorectal Surgery (Proctology)also

Find other General Surgery doctors in Minnesota →

Other general surgeons in Minnesota

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

• Jill Haxel, MD
• Lan Nguyen, MD
• Jeffrey D. Baker, MD
• Brian C. Grubbs, MD
• Rachel D. Aufforth, MD
• Lisa K. Owens, MD
• Miriam Steinberger, MD
• Vanessa R. Humphreville, MD

All general surgeons in Minnesota →

Other clinicians in Group Health Inc

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

• Pamela A. Wathum-Ocama-Wreh
• Nicholas H. Benson, MD
• Charles A. Bruen, MD
• Tyler J. Ulbrich, MD
• Rachel W. Salz, MD
• Rebecca S. Gieseker, 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