Nhan Nguyen, M.D.
NPI 1528248770 · Internal Medicine Physician · Garden Grove, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nhan Nguyen, M.D. is a Internal Medicine Physician provider in Garden Grove, CA (NPI 1528248770).
Provider details
- NPI number
- 1528248770
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A50424 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
283 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 222 | $79 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 61 | $67 |
Typical Medicare-allowed amounts for these services range $67–$79 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 50 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 226 | 59 |
| Losartan Potassium | 172 | 44 |
| Metformin Hcl | 116 | 30 |
| Amlodipine Besylate | 111 | 33 |
| Rosuvastatin Calcium | 110 | 32 |
| Empagliflozinbrand: Jardiance | 69 | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$22 across 1 record (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
Registry dates
- Enumerated
- 2007-11-05
- Last updated
- 2010-06-24
Frequently asked questions
- What is Nhan Nguyen's NPI number?
- Nhan Nguyen's National Provider Identifier (NPI) is 1528248770, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nhan Nguyen's specialty?
- Nhan Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Nhan Nguyen located?
- Nhan Nguyen's practice location on file with NPPES is 10298 Westminster Ave, Garden Grove, CA 92843-4830.
- What is Nhan Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Nhan Nguyen is (714) 537-8269.
- Does Nhan Nguyen accept Medicare?
- Nhan Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nhan Nguyen's NPI active?
- Yes — Nhan Nguyen's NPI (1528248770) is active in the NPPES registry as of the last update on 2010-06-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.