Tuan Nguyen, DO
NPI 1164959185 · Nephrology Physician · Rosemead, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tuan Nguyen, DO is a Nephrology Physician provider in Rosemead, CA (NPI 1164959185).
Provider details
- NPI number
- 1164959185
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- S4200 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
9 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
127 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 99 | $139 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 17 | $82 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 11 | $133 |
Typical Medicare-allowed amounts for these services range $82–$139 (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 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Losartan Potassium | 69 | 35 |
| Atorvastatin Calcium | 46 | 26 |
| Spironolactone | 44 | 22 |
| Amlodipine Besylate | 33 | 19 |
| Carvedilol | 20 | — |
| Nifedipinebrand: Nifedipine Er | 16 | — |
| Hydralazine Hcl | 13 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$60 across 2 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 (1)
- 4502 Medical DrSan Antonio, TX 78229-4402Phone: (210) 358-3555
Registry dates
- Enumerated
- 2017-05-22
- Last updated
- 2024-08-22
- Certified
- 2024-08-22
Frequently asked questions
- What is Tuan Nguyen's NPI number?
- Tuan Nguyen's National Provider Identifier (NPI) is 1164959185, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tuan Nguyen's specialty?
- Tuan Nguyen is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Tuan Nguyen located?
- Tuan Nguyen's practice location on file with NPPES is 9126 Valley Blvd Ste B, Rosemead, CA 91770-1987.
- What is Tuan Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Tuan Nguyen is (626) 573-9003.
- Does Tuan Nguyen accept Medicare?
- Tuan 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 Nguyen's NPI active?
- Yes — Tuan Nguyen's NPI (1164959185) is active in the NPPES registry as of the last update on 2024-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.