Joseph T. Nguyen, DO

Medicare activity in 2024

Official CMS public-use data for Joseph T. 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. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)116 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)72 services
3. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)17 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 cholesterol74%
• Arthritis45%
• Diabetes39%
• Ischemic heart disease26%
• Chronic kidney disease23%

Hospitals where Joseph T. Nguyen works

Medicare's Facility Affiliation Data lists Joseph T. 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.

• Memorialcare Saddleback Medical CenterLaguna Hills, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050603

Practice locations

Addresses where Joseph T. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).

• 1451 Irvine BlvdTustin, CA 92780 (714) 838‑8878

Group practices

Medicare enrollment lists Joseph T. Nguyen as a member of this group (CMS data updated October 2, 2026).

• Memorialcare Medical Foundation566 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in California →

Other family doctors in Tustin

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

• Kevin I. Metzger, DO
• Jack B. Vu, MD
• Malia A. Dadsetan, DO
• Chelsea Pham-Wightman, MD
• Lian T. Bach, DO
• Zaynab Madani, DO
• Stanley W. Cho, MD
• Brian M. Ngo, DO

All family doctors in Tustin →

Other clinicians in Memorialcare Medical Foundation

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

• Julie J. Oh, MD
• Matthew Janssen, MD
• James H. Ashizawa, MD
• Cheryl D. Guidry, NP
• Ellen D. Gim, MD
• Laurie A. Mortara, 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