Christian W. Ertl, MD

Medicare activity in 2024

Official CMS public-use data for Christian W. Ertl, 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. Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)51 services
2. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)25 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)17 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 pressure75%
• High cholesterol75%
• Arthritis52%
• Ischemic heart disease51%
• Chronic kidney disease45%
• Diabetes41%

Hospitals where Christian W. Ertl works

Medicare's Facility Affiliation Data lists Christian W. Ertl 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.

• Borgess Medical CenterKalamazoo, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230117
• Memorial Hospital of South BendSouth Bend, IN · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 150058

Practice locations

Addresses where Christian W. Ertl is enrolled with Medicare (CMS data updated October 2, 2026).

• 1717 Shaffer StKalamazoo, MI 49048 (269) 226‑5290
• 551 Linn StAllegan, MI 49010 (269) 686‑4926

Group practices

Medicare enrollment lists Christian W. Ertl as a member of these groups (CMS data updated October 2, 2026).

• Ascension Medical Group Promed262 clinicians in the group
• Ascension Borgess Allegan Hospital17 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in Michigan →

Other general surgeons in Kalamazoo

Clinicians with the same Medicare primary specialty in Kalamazoo, MI — not a recommendation.

• Sarah E. Charters, MD
• Henry S. Bjerke, MD
• Stephen T. Wysong, MD
• Robert L. Osmer, MD
• Ashley N. Armbruster, DO
• Brian N. Dishinger, MD
• Aamir Patel, MD
• Saad A. Shebrain, MD

All general surgeons in Kalamazoo →

Other clinicians in Ascension Medical Group Promed

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

• Sarah E. Charters, MD
• David C. Brown Jr., DO
• Pauline U. Boy, NP
• Brianna L. Shipp, CNM
• Thomas J. Webb, NP
• Amanda J. Adams, NP

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