Ajay R. Chapa, MD

Medicare activity in 2024

Official CMS public-use data for Ajay R. Chapa, 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. Blood creatinine level (82565)356 services
2. Insertion of needle into vein for collection of blood sample (36415)322 services
3. Injection, dexamethasone sodium phosphate, 1 mg (J1100)220 services
4. X-ray of hip, 2-3 views (73502)186 services
5. Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)180 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 cholesterol75%
• High blood pressure70%
• Arthritis65%
• Ischemic heart disease32%
• Diabetes29%
• Anxiety28%

Hospitals where Ajay R. Chapa works

Medicare's Facility Affiliation Data lists Ajay R. Chapa 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.

• Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140242
• Northwestern Memorial HospitalChicago, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140281

Practice locations

Addresses where Ajay R. Chapa is enrolled with Medicare (CMS data updated October 2, 2026).

• 676 N Saint Clair, Arkes 1725Chicago, IL 60611 (312) 695‑8108

Group practices

Medicare enrollment lists Ajay R. Chapa as a member of this group (CMS data updated October 2, 2026).

• Northwestern Medical Faculty Foundation4,503 clinicians in the group

Specialties

• Diagnostic Radiologyprimary

Find other Diagnostic Radiology doctors in Illinois →

Other radiologists in Chicago

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

• Sudeep Bhabad, MD
• Eric Basappa, MD
• Tyler J. Hinkel, DO
• Michael Benanti, MD
• Joseph George, MD
• David J. Rusinak, MD
• Richard Vincent M. Linchangco, MD
• Olga Vinokur, MD

All radiologists in Chicago →

Other clinicians in Northwestern Medical Faculty Foundation

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

• Lauren Carlos, MD
• Anthony Calendo
• Cynthia E. Bender, NP
• Rocio Rodriguez
• Nabil M. Issa, MD
• Jill Sathish

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