Quick answers
- Does Tu A. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Tu A. 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 Tu A. Nguyen see?
- In 2024, CMS data shows 656 Original Medicare patients and 1,708 services for Tu A. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Tu A. Nguyen's NPI number?
- 1497841969. 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 Tu A. 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 | 656 |
|---|---|
| Services billed to Medicare | 1,708 |
| Different services or procedures | 31 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)434 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)312 services
- Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)171 services
- Biopsy of large bowel using a flexible endoscope (45380)159 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)158 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 cholesterol75%
- High blood pressure62%
- Arthritis41%
- Osteoporosis29%
- Ischemic heart disease27%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)19%
Hospitals where Tu A. Nguyen works
Medicare's Facility Affiliation Data lists Tu A. 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.
- Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441
Practice locations
Addresses where Tu A. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1300 Crane StMenlo Park, CA 94025 (650) 498‑6500
- 300 Pasteur DrStanford, CA 94305
- 321 Middlefield Rd, Suite 260Menlo Park, CA 94025 (650) 498‑6500
Group practices
Medicare enrollment lists Tu A. Nguyen as a member of this group (CMS data updated October 2, 2026).
- University Healthcare Alliance327 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Menlo Park
Clinicians with the same Medicare primary specialty in Menlo Park, CA — not a recommendation.
Other clinicians in University Healthcare Alliance
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Irvine, California College Of Medicine |
| Graduation year | 2003 (23 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1497841969 |
| 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