Quick answers
- Does Chidao L. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Chidao L. 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 Chidao L. Nguyen see?
- In 2024, CMS data shows 711 Original Medicare patients and 3,757 services for Chidao L. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Chidao L. Nguyen's NPI number?
- 1780850198. 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 Chidao L. 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 | 711 |
|---|---|
| Services billed to Medicare | 3,757 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)2,124 services
- Hospital discharge day management, more than 30 minutes (99239)497 services
- Critical care, first 30-74 minutes (99291)364 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)320 services
- Advance care planning, first 30 minutes (99497)214 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%
- Arthritis60%
- Chronic kidney disease59%
- Diabetes57%
- Ischemic heart disease55%
Hospitals where Chidao L. Nguyen works
Medicare's Facility Affiliation Data lists Chidao L. 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.
- Garden Grove Hospital & Medical CenterGarden Grove, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050230
- Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050224
- Memorialcare Orange Coast Medical CenterFountain Valley, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050678
- UCI Health-OrangeOrange, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050348
Practice locations
Addresses where Chidao L. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 9353 Bolsa AveWestminster, CA 92683 (714) 751‑0995
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Westminster
Clinicians with the same Medicare primary specialty in Westminster, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Western University Of Health Sciences College Of Dental Med |
| Graduation year | 2006 (20 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1780850198 |
| 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