Alyssa Nguyen-Phuoc, MD

Medicare activity in 2024

Official CMS public-use data for Alyssa Nguyen-Phuoc, 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. Emergency department visit with high level of medical decision making (99285)119 services
2. Emergency department visit with moderate level of medical decision making (99284)91 services
3. Critical care, first 30-74 minutes (99291)83 services
4. Emergency department visit with low level of medical decision making (99283)31 services
5. Ultrasound of heart, follow-up (93308)23 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%
• Diabetes67%
• Arthritis64%
• Ischemic heart disease60%
• Heart failure47%

Hospitals where Alyssa Nguyen-Phuoc works

Medicare's Facility Affiliation Data lists Alyssa Nguyen-Phuoc 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 Alyssa Nguyen-Phuoc 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 Alyssa Nguyen-Phuoc as a member of this group (CMS data updated October 2, 2026).

• Regents of the University of129 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Orange

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

• Brieana H. Rodriguez, MD
• John J. Stroh, MD
• Megan Dickson, MD
• Christepher D. Yao, MD
• Kirsten K. Calder, MD
• Elise M. Molnar, MD
• Hamid Turay
• Michael W. Perlman, MD

All emergency medicine doctors in Orange →

Other clinicians in Regents of the University of

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

• Brieana H. Rodriguez, MD
• Edmund D. Hsu, MD
• Kuljinder Dosanjh, PA
• Kirsten K. Calder, MD
• Pooneh H. Glascock, MD
• Michael Valdivia, 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