Eloy Ruiz-Calderon, MD

Medicare activity in 2024

Official CMS public-use data for Eloy Ruiz-Calderon, 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. Insertion of artery tube for blood sampling or infusion through skin (36620)27 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%
• Arthritis66%
• Atrial fibrillation54%
• Ischemic heart disease52%
• Chronic kidney disease41%

Hospitals where Eloy Ruiz-Calderon works

Medicare's Facility Affiliation Data lists Eloy Ruiz-Calderon 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.

• HSHS St Elizabeth's HospitalO Fallon, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140187
• St Josephs HospitalBreese, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140145

Practice locations

Addresses where Eloy Ruiz-Calderon is enrolled with Medicare (CMS data updated October 2, 2026).

• 1 Saint Elizabeth BlvdO Fallon, IL 62269 (618) 234‑2120

Group practices

Medicare enrollment lists Eloy Ruiz-Calderon as a member of this group (CMS data updated October 2, 2026).

• North American Partners in Anesthesia Illinois LLC431 clinicians in the group

Specialties

• Anesthesiologyprimary

Find other Anesthesiology doctors in Illinois →

Other anesthesiologists in O Fallon

Clinicians with the same Medicare primary specialty in O Fallon, IL — not a recommendation.

• William Corbett, MD
• Edward Schuessler, MD
• Timothy L. Hainds, MD
• Esad Kiveric, DO
• Sally B. Portera Mankins, MD
• Gregory Bray, MD
• Ata Siddiqui, MD
• Marvin J. Mikeska, MD

All anesthesiologists in O Fallon →

Other clinicians in North American Partners in Anesthesia Illinois LLC

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

• George R. Stanton, MD
• Kari Rheinecker, CNA
• Paige Buckner, CNA
• Sara J. Schirding, CNA
• Kaman Cipi, MD
• Alia Safi, 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