Alexander Nguyen, D.O.
NPI 1265842470 · Hospitalist Physician · Irvine, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Nguyen, D.O. is a Hospitalist Physician provider in Irvine, CA (NPI 1265842470).
Provider details
- NPI number
- 1265842470
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A14372 (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
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
6 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
775 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 | 382 | $122 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 142 | $81 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 114 | $119 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 100 | $179 |
| Advance Care Planning, First 30 Minutes99497 | 37 | $78 |
Typical Medicare-allowed amounts for these services range $78–$179 (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 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ondansetronbrand: Ondansetron Odt | 72 | 72 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 49 | 49 |
| Levofloxacin | 33 | 33 |
| Nitroglycerin | 26 | 26 |
| Furosemide | 25 | 24 |
| Cefpodoxime Proxetil | 23 | 23 |
| Pantoprazole Sodium | 23 | 20 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$388 across 9 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 (5)
- 9920 Talbert AveFountain Valley, CA 92708-5153Phone: (714) 378-7000
- 100 E Valencia Mesa DrFullerton, CA 92835-3813Phone: (714) 447-5027
- 1680 E 120th StLos Angeles, CA 90059-3026Phone: (424) 338-8000
- 1798 N Garey AvePomona, CA 91767-2918Phone: (909) 865-7251
- 1880 N Orange Grove AvePomona, CA 91767-3006Phone: (909) 630-7158Fax: (909) 630-7983
Registry dates
- Enumerated
- 2014-04-28
- Last updated
- 2026-01-04
- Certified
- 2026-01-04
Frequently asked questions
- What is Alexander Nguyen's NPI number?
- Alexander Nguyen's National Provider Identifier (NPI) is 1265842470, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Nguyen's specialty?
- Alexander Nguyen is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Nguyen located?
- Alexander Nguyen's practice location on file with NPPES is 11 Technology Dr, Irvine, CA 92618-2302.
- What is Alexander Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Alexander Nguyen is (949) 923-3200.
- Does Alexander Nguyen accept Medicare?
- Alexander Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Nguyen's NPI active?
- Yes — Alexander Nguyen's NPI (1265842470) is active in the NPPES registry as of the last update on 2026-01-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.