Quick answers
- Does Hien H. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Hien H. 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 Hien H. Nguyen see?
- In 2024, CMS data shows 163 Original Medicare patients and 305 services for Hien H. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Hien H. Nguyen's NPI number?
- 1811974843. 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 Hien H. 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 | 163 |
|---|---|
| Services billed to Medicare | 305 |
| Different services or procedures | 23 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)117 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)47 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)29 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)21 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)18 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 cholesterol72%
- Arthritis60%
- Chronic kidney disease42%
- Depression36%
- Heart failure36%
Hospitals where Hien H. Nguyen works
Medicare's Facility Affiliation Data lists Hien H. 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.
- University of California Davis Medical CenterSacramento, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050599
Practice locations
Addresses where Hien H. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 2315 Stockton BlvdSacramento, CA 95817
- 4860 Y StSacramento, CA 95817
- 4861 Y StSacramento, CA 95817 (916) 734‑2525
Group practices
Medicare enrollment lists Hien H. Nguyen as a member of this group (CMS data updated October 2, 2026).
- Regents of the Univ of Ca1,584 clinicians in the group
Specialties
- Infectious Diseaseprimary
- Internal Medicinealso
Other infectious disease doctors in Sacramento
Clinicians with the same Medicare primary specialty in Sacramento, CA — not a recommendation.
Other clinicians in Regents of the Univ of Ca
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 1997 (29 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) | 1811974843 |
| 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