Quick answers
- Does Charles Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Charles Nguyen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Charles Nguyen see?
- In 2024, CMS data shows 382 Original Medicare patients and 2,133 services for Charles Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Charles Nguyen's NPI number?
- 1538400288. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Charles 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.
| Original Medicare patients | 382 |
|---|---|
| Services billed to Medicare | 2,133 |
| Different services or procedures | 23 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)892 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)274 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)192 services
- Dialysis services, 1 physician visit per month (20 years or older) (90962)190 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)180 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%
- Diabetes75%
- Chronic kidney disease75%
- Heart failure62%
- Ischemic heart disease47%
Hospitals where Charles Nguyen works
Medicare's Facility Affiliation Data lists Charles 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.
- Corona Regional Medical CenterCorona, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050329
- Loma Linda University Medical CenterLoma Linda, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050327
- Parkview Community Hospital Medical CenterRiverside, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050102
- San Antonio Regional HospitalUpland, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050099
Practice locations
Addresses where Charles Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1901 Town and Country Dr, Suite 102Norco, CA 92860 (951) 736‑8100
- 2057 Compton Ave, Suite 102Corona, CA 92881 (951) 736‑6757
Group practices
Medicare enrollment lists Charles Nguyen as a member of this group (CMS data updated October 2, 2026).
- Nephrology Associates Medical Group Inc64 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Nephrology Associates Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2011 (15 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538400288 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians