Hai D. Nguyen, MD

Medicare activity in 2024

Official CMS public-use data for Hai 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)911 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)570 services
3. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)167 services
4. Hospital discharge day management, more than 30 minutes (99239)132 services
5. Critical care, first 30-74 minutes (99291)50 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%
• Diabetes68%
• Heart failure55%
• Chronic kidney disease54%
• COPD54%

Hospitals where Hai D. Nguyen works

Medicare's Facility Affiliation Data lists Hai 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.

• Loma Linda University Medical Center-MurrietaMurrieta, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050770
• Riverside Community HospitalRiverside, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050022

Practice locations

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

• 36485 Inland Valley DrWildomar, CA 92595 (951) 677‑1111
• 4354 Latham St, Suite 100Riverside, CA 92501 (951) 466‑6628
• 4445 Magnolia AveRiverside, CA 92501 (951) 788‑3000
• 4500 Brockton Ave, Suite 305Riverside, CA 92501 (951) 877‑5874

Group practices

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

• Alertive Healthcare Medical Group Apc39 clinicians in the group
• Providence Healthcare Partners Inc37 clinicians in the group
• Grace Hospitalist Group Inc9 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Wildomar

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

• Cameron P. Hines, MD
• Tom X. Tan, MD
• Mohammad S. Rahmany, MD
• Tran T. Nguyen, DO
• Joan Chapman, DO
• Akhil Puri, DO
• Osvaldo A. Lopez, MD
• Danny H. Nguyen, DO

All internal medicine doctors in Wildomar →

Other clinicians in Alertive Healthcare Medical Group Apc

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

• Adnan A. Misellati, MD
• Manvir S. Wadhwa, MD
• Christine Mikhail, MD
• Adam Robarge, MD
• Ali Varasteh, MD
• Andrew Hwang, 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