Thomas Cahill Jr., MD

Medicare activity in 2024

Official CMS public-use data for Thomas Cahill Jr., 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. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)719 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)394 services
3. Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)168 services
4. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)45 services
5. Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician (93016)34 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%
• Arthritis54%
• Ischemic heart disease54%
• Heart failure43%
• Chronic kidney disease42%

Hospitals where Thomas Cahill Jr. works

Medicare's Facility Affiliation Data lists Thomas Cahill Jr. 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 Holy Family Hospital IncGreenville, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140137
• HSHS St Elizabeth's HospitalO Fallon, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140187
• Sparta Community HospitalSparta, IL · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 141349
• St Joseph's HospitalHighland, IL · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 141336
• St Josephs HospitalBreese, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140145

Practice locations

Addresses where Thomas Cahill Jr. is enrolled with Medicare (CMS data updated October 2, 2026).

• 1 Saint Elizabeth BlvdO Fallon, IL 62269 (618) 234‑2120
• 200 Health Care DrGreenville, IL 62246 (618) 664‑1230
• 3 Saint Elizabeth Blvd, Suite 2800O Fallon, IL 62269 (618) 233‑6044
• 9515 Holy Cross LnBreese, IL 62230 (618) 526‑4511

Group practices

Medicare enrollment lists Thomas Cahill Jr. as a member of these groups (CMS data updated October 2, 2026).

• Prairie Cardiovascular Consultants Ltd90 clinicians in the group
• St Josephs Hospital Breese of the Hospital Sisters of the Third Orde34 clinicians in the group
• St Elizabeths Hospital of the Hospital Sisters of the Third Order29 clinicians in the group
• HSHS Holy Family Hospital Inc25 clinicians in the group

Specialties

• Cardiovascular Disease (Cardiology)primary
• Internal Medicinealso

Find other Cardiovascular Disease (Cardiology) doctors in Illinois →

Other cardiologists in O Fallon

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

• John P. Scally, MD
• Frederick O. Ochieng, MD
• Atul S. Shah, MD
• Scott Marrus, MD
• Regina Y. Chiu, MD
• Pavan K. Gupta, MD
• Vinaya C. Mulkareddy, MD
• Theodore R. Addai, MD

All cardiologists in O Fallon →

Other clinicians in Prairie Cardiovascular Consultants Ltd

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

• Daniel E. Cox, MD
• Jeffrey D. Trachtenberg, MD
• John P. Scally, MD
• Muhammad Sheikh, MD
• Fidel Mata, PA
• Yifei Sun, 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