Theodore Nguyen, MD
NPI 1962573907 · Internal Medicine Physician · Anaheim, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Theodore Nguyen, MD is a Internal Medicine Physician provider in Anaheim, CA (NPI 1962573907).
Provider details
- NPI number
- 1962573907
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A75034 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 86 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 581 | 219 |
| Amlodipine Besylate | 309 | 113 |
| Losartan Potassium | 254 | 85 |
| Metformin Hcl | 246 | 85 |
| Lisinopril | 171 | 60 |
| Omeprazole | 166 | 78 |
| Glipizide | 159 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-13
- Last updated
- 2021-11-22
Frequently asked questions
- What is Theodore Nguyen's NPI number?
- Theodore Nguyen's National Provider Identifier (NPI) is 1962573907, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Theodore Nguyen's specialty?
- Theodore Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Theodore Nguyen located?
- Theodore Nguyen's practice location on file with NPPES is 441 N Lakeview Ave, Anaheim, CA 92807-3028.
- What is Theodore Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Theodore Nguyen is (888) 988-2800.
- Does Theodore Nguyen accept Medicare?
- Theodore Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Theodore Nguyen's NPI active?
- Yes — Theodore Nguyen's NPI (1962573907) is active in the NPPES registry as of the last update on 2021-11-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.