Alexis K. Warren, MD

Medicare activity in 2024

Official CMS public-use data for Alexis K. Warren, 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. Imaging of retina (92134)537 services
2. Established patient complete exam of visual system (92014)422 services
3. Injection of drug into eye (67028)174 services
4. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)82 services
5. Photography of the retina (92250)73 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 cholesterol74%
• Diabetes64%
• Arthritis53%
• Chronic kidney disease44%
• Ischemic heart disease33%

Hospitals where Alexis K. Warren works

Medicare's Facility Affiliation Data lists Alexis K. Warren 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.

• The University of Chicago Medical CenterChicago, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140088

Practice locations

Addresses where Alexis K. Warren is enrolled with Medicare (CMS data updated October 2, 2026).

• 5841 S Maryland AveChicago, IL 60637 (773) 702‑1000

Group practices

Medicare enrollment lists Alexis K. Warren as a member of these groups (CMS data updated October 2, 2026).

• University of Chicago1,712 clinicians in the group
• The University of Chicago Medical Center915 clinicians in the group

Specialties

• Ophthalmologyprimary

Find other Ophthalmology doctors in Illinois →

Other ophthalmologists in Chicago

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

• Nicholas J. Volpe, MD
• Nishanth P. Uli, MD
• Ria D. Desai, MD
• Rumya R. Rao, MD
• Josiah To, MD
• Camille V. Palma, MD
• Megan R. Silas, MD
• Ross Stuber, MD

All ophthalmologists in Chicago →

Other clinicians in University of Chicago

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

• Ernest G. Chan, MD
• Izabella Klima
• Yaman Kherallah, MD
• Ema Loewen
• Matthew Bonomo, MD
• Shmuel Price

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