Thai D. Nguyen, MD

Medicare activity in 2024

Official CMS public-use data for Thai D. Nguyen, 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. Insertion of needle into vein for collection of blood sample (36415)663 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)656 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)511 services
4. Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month (99490)443 services
5. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)177 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%
• Diabetes45%
• Arthritis43%
• Ischemic heart disease24%
• Osteoporosis22%

Hospitals where Thai D. Nguyen works

Medicare's Facility Affiliation Data lists Thai D. Nguyen 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 Thai D. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).

• 5030 Westminster AveSanta Ana, CA 92703 (714) 775‑8090
• 7631 Wyoming St, Suite 201Westminster, CA 92683 (714) 898‑0765

Group practices

Medicare enrollment lists Thai D. Nguyen as a member of these groups (CMS data updated October 2, 2026).

• Family Choice Aco Inc55 clinicians in the group
• Theresa Thanh Ngoc Nguyen MD Inc2 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Santa Ana

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

• Seema Goyal, MD
• Raouf A. Kayaleh, MD
• Frank Badin, MD
• Neeka Shayan, DO
• Minh C. Do, MD
• Daenielle Lang, MD
• Ravi K. Dixit, MD
• Swarajya L. Vemuri, MD

All internal medicine doctors in Santa Ana →

Other clinicians in Family Choice Aco Inc

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

• Vy C. Nguyen, MD
• Jeffrey T. Ho, DO
• Eliott Romero, MD
• Huong T. Quy, DO
• Victor H. Dinh, MD
• Paul T. Duong, 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