John L. Showel Jr., MD

Medicare activity in 2024

Official CMS public-use data for John L. Showel 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)199 services
2. Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes (99221)115 services
3. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)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 cholesterol71%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)66%
• Ischemic heart disease57%
• Arthritis53%
• Anxiety49%

Hospitals where John L. Showel Jr. works

Medicare's Facility Affiliation Data lists John L. Showel 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.

• Rush University Medical CenterChicago, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140119

Practice locations

Addresses where John L. Showel Jr. is enrolled with Medicare (CMS data updated October 2, 2026).

• 1620 W Harrison StChicago, IL 60612
• 1653 W Congress PkwyChicago, IL 60612
• 1700 W Van Buren StChicago, IL 60612 (312) 563‑2875
• 1725 W Harrison St, Suite 450Chicago, IL 60612 (312) 563‑4238

Group practices

Medicare enrollment lists John L. Showel Jr. as a member of this group (CMS data updated October 2, 2026).

• Rush University Medical Group1,551 clinicians in the group

Specialties

• Hematology/Oncologyprimary

Find other Hematology/Oncology doctors in Illinois →

Other hematologist-oncologists in Chicago

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

• Matias E. Sanchez, MD
• Pedro Antonio Hermida De Viveiros, MD
• Seshan Subramanian, MD
• Lisa L. Baddi, DO
• Shweta Gupta, MD
• Timothy S. Oh, MD
• Nooreen Hussain, DO
• Rimas V. Lukas, MD

All hematologist-oncologists in Chicago →

Other clinicians in Rush University Medical Group

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

• James N. Moy, MD
• Meghan Klavans, MD
• John F. Mast, MD
• Yesenia Valdez, MD
• Kimberly S. Blanchard
• Sarah B. Maier, 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