Hyung Won Choi, MD

Medicare activity in 2024

Official CMS public-use data for Hyung Won Choi, 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. Injection, gadobutrol, 0.1 ml (A9585)647 services
2. Screening 3d breast mammography (77063)630 services
3. Screening mammography (77067)630 services
4. Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) (G0279)172 services
5. Complete ultrasound scan of 1 breast (76641)164 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 pressure61%
• Arthritis51%
• Osteoporosis40%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)32%
• Diabetes24%

Hospitals where Hyung Won Choi works

Medicare's Facility Affiliation Data lists Hyung Won Choi 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.

• UCI Health-OrangeOrange, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050348

Practice locations

Addresses where Hyung Won Choi is enrolled with Medicare (CMS data updated October 2, 2026).

• 101 the City Dr SOrange, CA 92868 (714) 456‑7004

Group practices

Medicare enrollment lists Hyung Won Choi as a member of this group (CMS data updated October 2, 2026).

• UC Regents108 clinicians in the group

Specialties

• Diagnostic Radiologyprimary

Find other Diagnostic Radiology doctors in California →

Other radiologists in Orange

Clinicians with the same Medicare primary specialty in Orange, CA — not a recommendation.

• Ravi Gupta, MD
• April A. Ballard, MD
• Lin H. Hwang, DO
• Hiroshi Yoshioka, MD
• Rohit Khanna, MD
• Hieu T. Truong, MD
• James H. Shi, MD
• Daniel S. Chow, MD

All radiologists in Orange →

Other clinicians in UC Regents

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

• Yousuf Qaseem, MD
• Hiroshi Yoshioka, MD
• David R. Floriolli, MD
• Dayantha M. Fernando Ii, MD
• James H. Shi, MD
• Arash Anavim, 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