Hyojoon P. Hahn, MD

Medicare activity in 2024

Official CMS public-use data for Hyojoon P. Hahn, 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)1,203 services
2. Ct scan of blood vessels of neck with contrast (70498)317 services
3. Ct scan of blood vessels of head with contrast (70496)308 services
4. Ct scan of upper spine without contrast (72125)227 services
5. Mri scan of brain without contrast (70551)178 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%
• Arthritis68%
• Diabetes56%
• Ischemic heart disease51%
• Stroke or mini-stroke49%

Hospitals where Hyojoon P. Hahn works

Medicare's Facility Affiliation Data lists Hyojoon P. Hahn 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.

• Antelope Valley HospitalLancaster, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050056
• Glendale Memorial Hospital & Health CenterGlendale, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050058
• Northridge Hospital Medical CenterNorthridge, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050116
• Providence Saint Joseph Medical CenterBurbank, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050235
• Ridgecrest Regional HospitalRidgecrest, CA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 051333

Practice locations

Addresses where Hyojoon P. Hahn is enrolled with Medicare (CMS data updated October 2, 2026).

• 1081 N China Lake BlvdRidgecrest, CA 93555 (818) 639‑2901
• 17100 Euclid StFountain Valley, CA 92708 (818) 639‑2901
• 17100 Euclid St, Suite 4004Fountain Valley, CA 92708 (818) 639‑2901
• 317 N Palm Dr, Apt 4cBeverly Hills, CA 90210 (818) 639‑2901
• 44105 15th W St, Suite 100Lancaster, CA 93534 (818) 435‑1433

Group practices

Medicare enrollment lists Hyojoon P. Hahn as a member of these groups (CMS data updated October 2, 2026).

• Golden State Imaging Associates Inc239 clinicians in the group
• Renaissance Imaging Medical Associates Inc124 clinicians in the group

Specialties

• Diagnostic Radiologyprimary

Find other Diagnostic Radiology doctors in California →

Other radiologists in Ridgecrest

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

• Claudia T. Sadro, MD
• Douglas W. Rusnack, MD
• Matthew D. Alvin, MD

All radiologists in Ridgecrest →

Other clinicians in Golden State Imaging Associates Inc

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

• Lucas P. Hiller, MD
• Ryan Franke, MD
• John P. Lin, MD
• Reza Amerinasab, MD
• Harun Ozer, MD
• Naomi Saenz, 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