Quick answers
- Does Jim H. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Jim 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 Jim H. Nguyen see?
- In 2024, CMS data shows 509 Original Medicare patients and 2,072 services for Jim H. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Jim H. Nguyen's NPI number?
- 1417338898. 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 Jim 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 | 509 |
|---|---|
| Services billed to Medicare | 2,072 |
| Different services or procedures | 21 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)1,211 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)263 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)202 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)113 services
- Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes (99309)38 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%
- Chronic kidney disease75%
- Diabetes70%
- Heart failure57%
- Ischemic heart disease53%
Hospitals where Jim H. Nguyen works
Medicare's Facility Affiliation Data lists Jim 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.
- Emanate Health Foothill Presbyterian HospitalGlendora, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050597
- Emanate Health Inter-Community HospitalCovina, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050382
- San Dimas Community HospitalSan Dimas, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050588
- USC Arcadia HospitalArcadia, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050238
Practice locations
Addresses where Jim H. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1335 Cypress St, Suite 205San Dimas, CA 91773
- 625 the City Dr S, Suite 320Orange, CA 92868 (714) 202‑2330
Group practices
Medicare enrollment lists Jim H. Nguyen as a member of these groups (CMS data updated October 2, 2026).
- Southern California Hospitalist Network Medical Group Inc77 clinicians in the group
- California Kidney Specialists16 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in San Dimas
Clinicians with the same Medicare primary specialty in San Dimas, CA — not a recommendation.
Other clinicians in Southern California Hospitalist Network Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2020 (6 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) | 1417338898 |
| 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