Joseph M. Bresnahan, MD

Medicare activity in 2024

Official CMS public-use data for Joseph M. Bresnahan, 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. Biopsy of large bowel using a flexible endoscope (45380)140 services
2. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)99 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)86 services
4. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)54 services
5. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)52 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%
• Arthritis48%
• Diabetes45%
• Ischemic heart disease34%
• Chronic kidney disease30%

Hospitals where Joseph M. Bresnahan works

Medicare's Facility Affiliation Data lists Joseph M. Bresnahan 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.

• Loyola University Medical CenterMaywood, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140276
• MacNeal HospitalBerwyn, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140054

Practice locations

Addresses where Joseph M. Bresnahan is enrolled with Medicare (CMS data updated October 2, 2026).

• 2160 S 1st AveMaywood, IL 60153 (708) 216‑8372
• 3249 Oak Park AveBerwyn, IL 60402 (708) 783‑0700

Group practices

Medicare enrollment lists Joseph M. Bresnahan as a member of these groups (CMS data updated October 2, 2026).

• Loyola University Medical Center953 clinicians in the group
• Loyola Medical Group LLC127 clinicians in the group

Specialties

• Gastroenterologyprimary
• Internal Medicinealso

Find other Gastroenterology doctors in Illinois →

Other gastroenterologists in Maywood

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

• Carlos Simons Linares, MD
• Zohair Ahmed, MD
• Krystina Johnson
• Jonah N. Rubin
• Smriti Kumar
• Elora L. Arya, MD
• Muhammad Majeed, MD
• Samuel Leon, MD

All gastroenterologists in Maywood →

Other clinicians in Loyola University Medical Center

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

• Claudine S. Feliciano, DO
• Joseph Ogrodnik, MD
• Brent Olson, DO
• Brian Maxfield, DO
• Sean E. Greenhalgh, MD
• Mary Rouzer, 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