Charles Nguyen, M.D.
NPI 1538400288 · Nephrology Physician · Eastvale, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Nguyen, M.D. is a Nephrology Physician provider in Eastvale, CA (NPI 1538400288).
Provider details
- NPI number
- 1538400288
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A124779 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,929 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 892 | $76 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 274 | $112 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 192 | $114 |
| Dialysis Services, 1 Physician Visit Per Month (20 Years Or Older)90962 | 190 | $200 |
| 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'SG2211 | 180 | $16 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 59 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Dapagliflozin Propanediolbrand: Farxiga | 339 | 41 |
| Calcitriol | 223 | 59 |
| Furosemide | 215 | 68 |
| Amlodipine Besylate | 203 | 77 |
| Sodium Zirconium Cyclosilicatebrand: Lokelma | 147 | 32 |
| Hydralazine Hcl | 143 | 56 |
| Losartan Potassium | 141 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,107 across 56 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1901 Town and Country DrNorco, CA 92860-3611Phone: (951) 736-8100Fax: (951) 736-8787
Registry dates
- Enumerated
- 2013-03-05
- Last updated
- 2021-08-09
- Certified
- 2021-08-09
Frequently asked questions
- What is Charles Nguyen's NPI number?
- Charles Nguyen's National Provider Identifier (NPI) is 1538400288, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Nguyen's specialty?
- Charles Nguyen is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Nguyen located?
- Charles Nguyen's practice location on file with NPPES is 12523 Limonite Ave Ste 400, Eastvale, CA 91752-3666.
- What is Charles Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Charles Nguyen is (951) 398-6868.
- Does Charles Nguyen accept Medicare?
- Charles Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Nguyen's NPI active?
- Yes — Charles Nguyen's NPI (1538400288) is active in the NPPES registry as of the last update on 2021-08-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.