Chidao Nguyen, DO
NPI 1780850198 · Hospitalist Physician · Westminster, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Chidao Nguyen, DO is a Hospitalist Physician provider in Westminster, CA (NPI 1780850198).
Provider details
- NPI number
- 1780850198
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 20A10338 (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
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
3,749 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 50 Minutes99233 | 2,124 | $117 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 497 | $114 |
| Critical Care, First 30-74 Minutes99291 | 364 | $207 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 320 | $171 |
| Advance Care Planning, First 30 Minutes99497 | 214 | $75 |
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 123 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 52 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 111 | 32 |
| Furosemide | 94 | 54 |
| Metoprolol Tartrate | 87 | 39 |
| Amlodipine Besylate | 81 | 42 |
| Pantoprazole Sodium | 81 | 34 |
| Apixabanbrand: Eliquis | 55 | 20 |
| Losartan Potassium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$79 across 3 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
Registry dates
- Enumerated
- 2008-05-06
- Last updated
- 2017-04-19
Frequently asked questions
- What is Chidao Nguyen's NPI number?
- Chidao Nguyen's National Provider Identifier (NPI) is 1780850198, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chidao Nguyen's specialty?
- Chidao Nguyen is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Chidao Nguyen located?
- Chidao Nguyen's practice location on file with NPPES is 9353 Bolsa Ave, Westminster, CA 92683-5951.
- What is Chidao Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Chidao Nguyen is (800) 461-4651.
- Does Chidao Nguyen accept Medicare?
- Chidao Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Chidao Nguyen's NPI active?
- Yes — Chidao Nguyen's NPI (1780850198) is active in the NPPES registry as of the last update on 2017-04-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.