Quick answers
- Does William L. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says William L. Nguyen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does William L. Nguyen see?
- In 2024, CMS data shows 192 Original Medicare patients and 1,243 services for William L. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is William L. Nguyen's NPI number?
- 1457452757. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for William L. Nguyen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 192 |
|---|---|
| Services billed to Medicare | 1,243 |
| Different services or procedures | 26 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)405 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)343 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)150 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)95 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)80 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes65%
- Arthritis47%
- Ischemic heart disease45%
- Chronic kidney disease42%
Hospitals where William L. Nguyen works
Medicare's Facility Affiliation Data lists William L. Nguyen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Houston Methodist Sugar Land HospitalSugar Land, TX · Acute Care Hospital · Medicare rating: 5 of 5 stars · CCN 450820
- Memorial Hermann - Texas Medical CenterHouston, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · CCN 450068
Practice locations
Addresses where William L. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 4126 Southwest FwyHouston, TX 77027
- 4126 Southwest Fwy, Suite 600cHouston, TX 77027
- 4126 Southwest Fwy 600cHouston, TX 77027 (713) 626‑9971
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Houston
Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At San Antonio |
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457452757 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians