William L. Whittier, MD

Medicare activity in 2024

Official CMS public-use data for William L. Whittier, 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 35 minutes (99232)337 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)306 services
3. Hemodialysis procedure with physician evaluation (90935)214 services
4. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)164 services
5. Dialysis services, 4 or more physician visits per month (20 years or older) (90960)161 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%
• Chronic kidney disease75%
• Ischemic heart disease69%
• Diabetes65%
• Heart failure65%

Hospitals where William L. Whittier works

Medicare's Facility Affiliation Data lists William L. Whittier 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 Oak Park HospitalOak Park, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140063
• 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 William L. Whittier is enrolled with Medicare (CMS data updated October 2, 2026).

• 104 S Ashland AveChicago, IL 60607 (312) 850‑8434

Group practices

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

• Edmund J Lewis MD and Associates5 clinicians in the group

Specialties

• Nephrologyprimary

Find other Nephrology doctors in Illinois →

Other nephrologists in Chicago

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

• Jerome C. Lane, MD
• Ignatius Tang, MD
• Deirdre M. Bartlett, MD
• Vaseem I. Qureshi, MD
• Michael Fischer, MD
• Rizma J. Bajwa, MD
• Vikram Aggarwal, MD
• Samantha C. Gunning, MD

All nephrologists in Chicago →

Other clinicians in Edmund J Lewis MD and Associates

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

• Stephen M. Korbet, MD
• Roger A. Rodby, MD
• Pravir V. Baxi, MD
• Casey N. Gashti, 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