Diana Y. Zhao

Medicare activity in 2024

Official CMS public-use data for Diana Y. Zhao, 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. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)111 services
2. Prolonged hospital inpatient or observation care evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by th (G0316)82 services
3. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)12 services
4. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)11 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%
• Arthritis55%
• Chronic kidney disease53%
• Ischemic heart disease49%
• Diabetes43%

Hospitals where Diana Y. Zhao works

Medicare's Facility Affiliation Data lists Diana Y. Zhao 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.

• Barnes Jewish HospitalSaint Louis, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260032
• Barnes-Jewish West County HospitalCreve Coeur, MO · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 260162

Practice locations

Addresses where Diana Y. Zhao is enrolled with Medicare (CMS data updated October 2, 2026).

• 1 Barnes Jew Hosp PlzSaint Louis, MO 63110 (314) 747‑3000
• 12634 Olive BlvdSaint Louis, MO 63141 (314) 996‑8000

Group practices

Medicare enrollment lists Diana Y. Zhao as a member of this group (CMS data updated October 2, 2026).

• Washington University3,029 clinicians in the group

Specialties

• Hospitalistprimary
• Internal Medicinealso

Find other Hospitalist doctors in Missouri →

Other hospitalists in Saint Louis

Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.

• Mikael G. Garri, MD
• Rehan Rais, MD
• Abdullah A. Masud, MD
• Timothy K. Ackerman, MD
• Alvin Jeon, MD
• Natalia Brito Rivera, MD
• Joshua P. Felgenhauer, MD
• Shuchi Pandey

All hospitalists in Saint Louis →

Other clinicians in Washington University

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

• Robert J. Gropler, MD
• Matthew J. McHale, DO
• Jeffrey J. Atkinson, MD
• Brendan J. Knapp, MD
• Jason Snyder, MD
• Mark D. Huffman, 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