Quick answers
- Does Ha S. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Ha S. 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 Ha S. Nguyen see?
- In 2024, CMS data shows 413 Original Medicare patients and 2,903 services for Ha S. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Ha S. Nguyen's NPI number?
- 1518256429. 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 Ha S. 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 | 413 |
|---|---|
| Services billed to Medicare | 2,903 |
| Different services or procedures | 68 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Continuous intraoperative neurophysiology monitoring, from outside the operating room (remote or nearby), per patient, (attention directed exclusively to one patient) each 15 minutes (list in addition to primary procedure) (G0453)1,301 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)442 services
- Placement of skin electrodes and measurement of stimulated sites on arms and legs (95938)214 services
- Needle measurement of electrical activity in arm, leg, trunk or head muscles, limited study (95870)153 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)132 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%
- Arthritis75%
- Diabetes40%
- Ischemic heart disease39%
- Depression38%
Hospitals where Ha S. Nguyen works
Medicare's Facility Affiliation Data lists Ha S. 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.
- Lompoc Valley Medical CenterLompoc, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050110
- Los Robles Hospital & Medical CenterThousand Oaks, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050549
- Mission Community HospitalPanorama City, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050704
- Sherman Oaks HospitalSherman Oaks, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050755
- USC Arcadia HospitalArcadia, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050238
Practice locations
Addresses where Ha S. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 2945 Townsgate Rd, Suite 200Westlake Vlg, CA 91361 (805) 372‑1679
- 3863 Sherwood PlSherman Oaks, CA 91423 (720) 939‑2431
- 527 Santa Maria RdArcadia, CA 91007 (714) 732‑1202
Specialties
- Neurosurgeryprimary
Other neurosurgeons in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Indiana University School Of Medicine |
| Graduation year | 2011 (15 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) | 1518256429 |
| 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