Tam H. Nguyen, DO

Medicare activity in 2024

Official CMS public-use data for Tam H. 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 moderate level of decision making, if using time, 30 minutes or more (99214)2,767 services
2. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)196 services
3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)166 services
4. Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and (G0180)66 services
5. Residence visit for established patient with moderate level of medical decision making, per day, if using time, at least 40 minutes (99349)42 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%
• Diabetes59%
• Arthritis30%
• Ischemic heart disease22%
• Chronic kidney disease22%

Hospitals where Tam H. Nguyen works

Medicare's Facility Affiliation Data lists Tam H. 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.

• Santa Clara Valley Medical CenterSan Jose, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050038
• Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441

Practice locations

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

• 200 Jose Figueres Ave, Suite 180San Jose, CA 95116 (408) 258‑5083
• 2365 Quimby Rd, Suite 160San Jose, CA 95122 (408) 550‑2750
• 4009 Bellaire Blvd, Suite MHouston, TX 77025

Group practices

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

• Action Therapy Centers Limited76 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in San Jose

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

• Gene Ma, MD
• Mahum Sami, DO
• Linh T. Dao, MD
• Priya Rajkumar, MD
• Leena K. Gupta, MD
• Vidya Nagaraju, MD
• Harsha Ramchandani, MD
• Nivedita Lakhera, MD

All internal medicine doctors in San Jose →

Other clinicians in Action Therapy Centers Limited

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

• Pradeep Kodali, MD
• Min Liang, MD
• Herbert P. Edmundson Jr., MD
• Cheryl J. Vallie, NP
• Jonathan N. Sellin, MD
• Sharon X. Li, 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