Quick answers
- Does Duc M. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Duc M. 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 Duc M. Nguyen see?
- In 2024, CMS data shows 30 Original Medicare patients and 30 services for Duc M. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Duc M. Nguyen's NPI number?
- 1619596798. 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 Duc M. 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 | 30 |
|---|---|
| Services billed to Medicare | 30 |
| Different services or procedures | 3 |
| Participating Medicare provider | Yes |
| Average age of these patients | 51 |
Most frequent services
- Psychiatric diagnostic evaluation with medical services (90792)28 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 cholesterol50%
- Anxiety50%
- Depression43%
- High blood pressure40%
Practice locations
Addresses where Duc M. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 2100 Napa Vallejo HwyNapa, CA 94558 (916) 651‑8811
Group practices
Medicare enrollment lists Duc M. Nguyen as a member of this group (CMS data updated October 2, 2026).
- Department of State Hospitals270 clinicians in the group
Specialties
- Psychiatryprimary
Other psychiatrists in Napa
Clinicians with the same Medicare primary specialty in Napa, CA — not a recommendation.
Other clinicians in Department of State Hospitals
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Medical school | University Of Texas Southwestern Medical School At Dallas |
|---|---|
| Graduation year | 2020 (6 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1619596798 |
| 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
- 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