Tuan Xuan Nguyen, MD
NPI 1679519821 · Internal Medicine Physician · Garden Grove, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tuan Xuan Nguyen, MD is a Internal Medicine Physician provider in Garden Grove, CA (NPI 1679519821).
Provider details
- NPI number
- 1679519821
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A48636 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
7,694 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 1,811 | $64 |
| Management Using the Results of Remote Vital Sign Monitoring Per Calendar Month, First 20 Minutes99457 | 1,763 | $51 |
| Remote Monitoring of Physiologic Parameters, Initial Supply of Devices With Daily Recordings Or Programmed Alerts Transmission, Each 30 Days99454 | 1,611 | $53 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 945 | $95 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 795 | $133 |
| Insertion of Needle Into Vein for Collection of Blood Sample |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 145 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 995 | 269 |
| Losartan Potassium | 891 | 215 |
| Amlodipine Besylate | 823 | 196 |
| Gabapentin | 550 | 121 |
| Metformin Hcl | 515 | 126 |
| Triamcinolone Acetonide | 449 | 142 |
| Tamsulosin Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-22
- Last updated
- 2018-10-15
Frequently asked questions
- What is Tuan Xuan Nguyen's NPI number?
- Tuan Xuan Nguyen's National Provider Identifier (NPI) is 1679519821, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tuan Xuan Nguyen's specialty?
- Tuan Xuan Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Tuan Xuan Nguyen located?
- Tuan Xuan Nguyen's practice location on file with NPPES is 14221 Euclid St, Garden Grove, CA 92843-4991.
- What is Tuan Xuan Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Tuan Xuan Nguyen is (714) 530-2420.
- Does Tuan Xuan Nguyen accept Medicare?
- Tuan Xuan Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tuan Xuan Nguyen's NPI active?
- Yes — Tuan Xuan Nguyen's NPI (1679519821) is active in the NPPES registry as of the last update on 2018-10-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.