Charles L. Nguyen, D.O.
Internal Medicine Physician · Houston, TX
Charles L. Nguyen, D.O. is an internal medicine physician with a practice address in Houston, Texas, and NPI 1679704084, issued on Aug 3, 2009. Check the license (Texas Q3746, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Charles L. Nguyen
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- Q3746 TX
OS016027 PA
Self-reported in NPPES; status is on the state search - Practice location
- 2626 S Loop W Ste 265, Houston, TX 77054
- Phone
- (713) 796-9955
- Enumerated
- Aug 3, 2009
- Record last updated
- May 5, 2022
- Medicare enrollment
- Enrolled (PECOS I20150514002519); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2009
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 2626 S Loop W Ste 265
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Joseph Chmielewski, NPFamily Nurse Practitioner1508451378
- Rodrigo Guanlao, MDGeriatric Medicine (Family Medicine) Physician1750636742
Verify Charles L. Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license Q3746Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.3 times the Medicare Part D claims of the average internal medicine physician in 2024
10,477 Medicare Part D claims for 368 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Atorvastatin Calcium577 claims
- Levothyroxine Sodium465 claims
- Furosemide408 claims
- Amlodipine Besylate377 claims
- Eliquis358 claims
- Gabapentin336 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $184.78
4 payments; by number, the most common kind was food and beverage; the largest payer was E.R. Squibb & Sons, L.L.C. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Trumen Physicians And Associates PLLCHouston, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Charles L. Nguyen among 9,175 internal medicine physician records in Texas
Charles L. Nguyen, D.O. is one of 9,175 internal medicine physician records with a practice address in Texas. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 54% of them.
- NPI issued2009 · 54% of these records are older, 42% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2009 · median 2004 among the 6,088 with a school on file
- Record last updated2022 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,488 internal medicine physician records list a practice address in Houston
They are 1,488 of the 61,221 NPPES records with a practice address in Houston, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Houston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Richard Carney, MDHouston, TX 770541124018544
- Adil Cheema, M.D.Houston, TX 770541376554535
- Donnie Evans, M.D.Houston, TX 770541568578789
- Howard Grant, MDHouston, TX 770541205940665
- Olendruff Johnson, M.D.Houston, TX 770541730186669
- Joel Kneitz, MDHouston, TX 770541356327498
- Christopher Lockhart, M.D.Houston, TX 770541336180504
- Nghia Nguyen, M.D.Houston, TX 770541922042977
Common questions
What is Charles L. Nguyen, D.O.'s NPI number?
Charles L. Nguyen, D.O.'s National Provider Identifier (NPI) is 1679704084, issued on Aug 3, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Charles L. Nguyen, D.O. located?
The NPPES record lists a practice address at 2626 S Loop W Ste 265, Houston, TX, 77054. Phone: (713) 796-9955. Providers update this record themselves, so call before visiting.
How can I verify Charles L. Nguyen, D.O.'s license?
NPPES lists Texas license number Q3746, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Charles L. Nguyen, D.O. prescribe under Medicare Part D?
In 2024, Charles L. Nguyen, D.O. had 10,477 Medicare Part D claims for 368 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.