Hoon Ji H. Choi, MD

Medicare activity in 2024

Official CMS public-use data for Hoon Ji H. 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. Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)1,141 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)806 services
3. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)805 services
4. Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report (95251)620 services
5. Telephone medical discussion with physician, 21-30 minutes (99443)434 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%
• Diabetes54%
• Arthritis45%
• Osteoporosis39%
• Chronic kidney disease32%

Hospitals where Hoon Ji H. Choi works

Medicare's Facility Affiliation Data lists Hoon Ji H. 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.

• Memorialcare Long Beach Medical CenterLong Beach, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050485
• UCI Health-OrangeOrange, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050348

Practice locations

Addresses where Hoon Ji H. Choi is enrolled with Medicare (CMS data updated October 2, 2026).

• 3772 Katella Ave, Suite 107Los Alamitos, CA 90720 (562) 431‑7877

Specialties

• Endocrinologyprimary
• Internal Medicinealso

Find other Endocrinology doctors in California →

Other endocrinologists in California

Clinicians with the same Medicare primary specialty in California — not a recommendation.

• Neil Q. Tran, MD
• Anne Marie Barnett, MD
• Rahil A. Bandukwala, DO
• Christina Kwan, MD
• Leena Singh, MD
• Amita Risbud, MD
• Anshu K. Buttan, MD
• Rose H. Lin, MD

All endocrinologists in California →

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