Richard X. Nguyen, MD

Medicare activity in 2024

Official CMS public-use data for Richard X. 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. Care management services for behavioral health conditions, 20 minutes or more clinical staff time directed by health care professional (99484)2,234 services
2. Chronic care management services for two or more chronic conditions, first 30 minutes provided personally by health care professional, per calendar month (99491)1,842 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)893 services
4. Injection of drug or substance under skin or into muscle (96372)687 services
5. Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg (J3420)399 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%
• Depression75%
• Anxiety75%
• Arthritis57%
• Diabetes54%

Hospitals where Richard X. Nguyen works

Medicare's Facility Affiliation Data lists Richard X. 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.

• Community Memorial Hospital - VenturaVentura, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050394
• St Johns Regional Medical CenterOxnard, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050082

Practice locations

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

• 719 N A StOxnard, CA 93030

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Oxnard

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

• Sulaiman J. Barkho, MD
• Eric G. Abkian, MD
• Harpreet K. Singh, MD
• Kioumars Bolourian Kashi, MD
• Artur Amirkhanyan, DO
• Rajeev Sharma, MD
• Manuel F. Beltran, MD
• Dzenana Cabaravdic, MD

All internal medicine doctors in Oxnard →

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