James Y. Hyun, MD

Medicare activity in 2024

Official CMS public-use data for James Y. Hyun, 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. Ct scan head or brain without contrast (70450)164 services
2. X-ray of chest, 1 view (71045)130 services
3. Ct scan of abdomen and pelvis with contrast (74177)99 services
4. Ct scan of blood vessels of chest with contrast (71275)68 services
5. Ct scan of abdomen and pelvis without contrast (74176)49 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%
• Arthritis59%
• Ischemic heart disease40%
• Depression39%
• Chronic kidney disease39%

Hospitals where James Y. Hyun works

Medicare's Facility Affiliation Data lists James Y. Hyun 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.

• Pomona Valley Hospital Medical CenterPomona, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050231

Practice locations

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

• 1798 N Garey AvePomona, CA 91767 (909) 865‑9535
• 24276 166th Airport RdEagle Butte, SD 57625
• 3406 Kildare CtBurbank, CA 91504 (909) 865‑9500
• 4413 US Hwy 331 SDefuniak Springs, FL 32435 (850) 920‑2065
• PO Box, Suite 1012Eagle Butte, SD 57625

Group practices

Medicare enrollment lists James Y. Hyun as a member of these groups (CMS data updated October 2, 2026).

• Eagle Butte Indian Health Service Hospital42 clinicians in the group
• North Walton Rural Hospital LLC32 clinicians in the group
• Pomona Valley Imaging Medical Group Inc24 clinicians in the group

Specialties

• Diagnostic Radiologyprimary

Find other Diagnostic Radiology doctors in California →

Other radiologists in Pomona

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

• Yu-Kai Su, MD
• Johnson B. Lightfoote, MD
• Gary L. Jensen, MD
• Michael H. Huang, MD
• Stephen Y. To, MD
• Yanle Zhao, MD
• Yuming Yin, MD
• Catherine Peterson

All radiologists in Pomona →

Other clinicians in Eagle Butte Indian Health Service Hospital

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

• Ann M. Maher, MNT
• Brooklyn O. Behrens, PA
• Darci J. Harper, NP
• Glenda M. Gensolin, MD
• Robert White, DO
• Yeisabeth M. Jimenez Almeyda, 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