Quick answers
- Does Diana Doan-Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Diana Doan-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 Diana Doan-Nguyen see?
- In 2024, CMS data shows 169 Original Medicare patients and 339 services for Diana Doan-Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Diana Doan-Nguyen's NPI number?
- 1225792369. 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 Diana Doan-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 | 169 |
|---|---|
| Services billed to Medicare | 339 |
| Different services or procedures | 29 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)91 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)75 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)31 services
- Insertion of needle into vein for collection of blood sample (36415)18 services
- Urinalysis, manual test (81002)11 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 cholesterol75%
- High blood pressure70%
- Arthritis52%
- Diabetes24%
- Osteoporosis24%
- Ischemic heart disease20%
Hospitals where Diana Doan-Nguyen works
Medicare's Facility Affiliation Data lists Diana Doan-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.
- UCI Health-OrangeOrange, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050348
Practice locations
Addresses where Diana Doan-Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 101 the City Dr SOrange, CA 92868 (714) 456‑7004
- 4699 Jamboree RdNewport Beach, CA 92660 (949) 557‑0951
Group practices
Medicare enrollment lists Diana Doan-Nguyen as a member of these groups (CMS data updated October 2, 2026).
- Hoag Clinic460 clinicians in the group
- Regents of the University of129 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Orange
Clinicians with the same Medicare primary specialty in Orange, CA — not a recommendation.
Other clinicians in Hoag Clinic
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1225792369 |
| 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