Charles Nguyen, MD, PHD
NPI 1528372398 · Hospitalist Physician · The Woodlands, TX
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Charles Nguyen, MD, PHD is a Hospitalist Physician provider in The Woodlands, TX (NPI 1528372398).
Provider details
- NPI number
- 1528372398
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- N6943 (TX)
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
15 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
681 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 | 267 | $115 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 189 | $77 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 171 | $111 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 42 | $168 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 12 | $127 |
Typical Medicare-allowed amounts for these services range $77–$168 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cefdinir | 34 | 34 |
| Levothyroxine Sodium | 33 | 17 |
| Amlodipine Besylate | 33 | 20 |
| Atorvastatin Calcium | 32 | 18 |
| Furosemide | 31 | 20 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 30 | 29 |
| Prednisone |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$124 across 1 record (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
Registry dates
- Enumerated
- 2010-08-03
- Last updated
- 2024-10-30
- Certified
- 2024-10-30
Frequently asked questions
- What is Charles Nguyen's NPI number?
- Charles Nguyen's National Provider Identifier (NPI) is 1528372398, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Nguyen's specialty?
- Charles Nguyen is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Nguyen located?
- Charles Nguyen's practice location on file with NPPES is 17201 Interstate 45 S, The Woodlands, TX 77385-3311.
- What is Charles Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Charles Nguyen is (936) 270-2099.
- Does Charles Nguyen accept Medicare?
- Charles Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Charles Nguyen's NPI active?
- Yes — Charles Nguyen's NPI (1528372398) is active in the NPPES registry as of the last update on 2024-10-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.