Okwudili Nnaji, MD

Medicare activity in 2024

Official CMS public-use data for Okwudili Nnaji, 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. Hemodialysis procedure with physician evaluation (90935)119 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)68 services
3. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)28 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)23 services
5. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)19 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%
• Diabetes75%
• Chronic kidney disease75%
• Arthritis55%
• Heart failure54%

Hospitals where Okwudili Nnaji works

Medicare's Facility Affiliation Data lists Okwudili Nnaji 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.

• Suny/Downstate University Hospital of BrooklynBrooklyn, NY · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 330350

Practice locations

Addresses where Okwudili Nnaji is enrolled with Medicare (CMS data updated October 2, 2026).

• 450 Clarkson AveBrooklyn, NY 11203 (718) 826‑4959

Group practices

Medicare enrollment lists Okwudili Nnaji as a member of this group (CMS data updated October 2, 2026).

• University Physicians of Brooklyn, Inc.177 clinicians in the group

Specialties

• Nephrologyprimary

Find other Nephrology doctors in New York →

Other nephrologists in Brooklyn

Clinicians with the same Medicare primary specialty in Brooklyn, NY — not a recommendation.

• Mariana Chang, MD
• Sheldon Greenberg, MD
• Samuel Spitalewitz, MD
• Lawrence Stam, MD
• Stacey Weiss, MD
• Brian Hoch, MD
• Jun Li
• Neal Mittman, MD

All nephrologists in Brooklyn →

Other clinicians in University Physicians of Brooklyn, Inc.

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

• Julie Huang, DO
• Vatcharapan Umpaichitra, MD
• Koray Arica, MD
• Everton A. Prospere, MD
• Daniel E. Winetsky, MD
• Hua-Fang Lin, 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