Thien An Nguyen, M.D.
Critical Care Medicine (Internal Medicine) Physician · Katy, TX
Thien An Nguyen, M.D. is a critical care medicine (internal medicine) physician with a practice address in Katy, Texas, and NPI 1477872505, issued on May 28, 2010. Check the license (Texas Q9696, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Thien An Nguyen
- Credential
- M.D.
- Primary taxonomy
- Critical Care Medicine (Internal Medicine) Physician 207RC0200X
- License number
- Q9696 TX
Self-reported in NPPES; status is on the state search - Practice location
- PO Box 475, Katy, TX 77492
- Phone
- (281) 703-3020
- Enumerated
- May 28, 2010
- Record last updated
- Aug 12, 2024
- Fax
- (281) 578-4862
- Medicare enrollment
- Enrolled (PECOS I20170123001354); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest critical care medicine (internal medicine) physician records → All 413 in Texas → Look up another NPI →
Verify Thien An Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license Q9696Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% fewer Medicare Part D claims than the average critical care medicine (internal medicine) physician in 2024
378 Medicare Part D claims for 74 beneficiaries, against an average of 696 among the 2,873 providers of this specialty who prescribed in Part D. Brand-name drugs were 61% of claims.
Most prescribed
- Trelegy Ellipta114 claims
- Breztri Aerosphere43 claims
- Albuterol Sulfate Hfa33 claims
- Methylprednisolone20 claims
- Azithromycin18 claims
- Anoro Ellipta14 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: $306.18
12 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 2,708 providers of this specialty with any payment received $2,958.68 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 2 group practices
- Katy Critical Care Consultants PLLCKaty, TX
- Q-Health Partners PLLCHouston, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thien An Nguyen among 413 critical care medicine (internal medicine) physician records in Texas
Thien An Nguyen, M.D. is one of 413 critical care medicine (internal medicine) physician records with a practice address in Texas. 90% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 53% of them.
- NPI issued2010 · 53% of these records are older, 43% newer
- In a Medicare fileYes · 90% of these records are
- In the CMS Doctors and Clinicians fileYes · 84% of these records are
- Graduated2010 · median 2007 among the 346 with a school on file
- Record last updated2024 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0200X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Internal Medicine) Physician providers in Texas
There are 413 critical care medicine (internal medicine) physician records in Texas.
All 413 in Texas → Every provider in Katy → Critical Care Medicine (Internal Medicine) Physician nationwide →
The 8 critical care medicine (internal medicine) physician records with the nearest ZIP codes
- Mary Udyavar, AGACNPKaty, TX 774931932827268
- Brian Gray, D.O.Katy, TX 774941942438098
- Anisha Arora, MDSugar Land, TX 774791720246150
- Elton Chen, D.O.Sugar Land, TX 774791215226303
- Hiba El-Qaddoumi, M.D.Sugar Land, TX 774791740560705
- Diana Guerra, MDSugar Land, TX 774791023200623
- Jonathan Jaffe, M.D.Sugar Land, TX 774791578982609
- Munish Lapsia, MDSugar Land, TX 774791467613901
Common questions
What is Thien An Nguyen, M.D.'s NPI number?
Thien An Nguyen, M.D.'s National Provider Identifier (NPI) is 1477872505, issued on May 28, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Thien An Nguyen, M.D. located?
The NPPES record lists a practice address at PO Box 475, Katy, TX, 77492. Phone: (281) 703-3020. Providers update this record themselves, so call before visiting.
How can I verify Thien An Nguyen, M.D.'s license?
NPPES lists Texas license number Q9696, 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 Thien An Nguyen, M.D. prescribe under Medicare Part D?
In 2024, Thien An Nguyen, M.D. had 378 Medicare Part D claims for 74 beneficiaries; the average among critical care medicine (internal medicine) physician prescribers was 696. 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.