Ha Nguyen, MD
NPI 1518256429 · Neurological Surgery Physician · Thousand Oaks, CA
Enrolled with Medicare as Practitioner - Neurosurgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ha Nguyen, MD is a Neurological Surgery Physician provider in Thousand Oaks, CA (NPI 1518256429).
Provider details
- NPI number
- 1518256429
- Entity type
- Individual
- Primary specialty
- Neurological Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A15373 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
15 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,714 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| 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 | $33 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 442 | $112 |
| Placement of Skin Electrodes and Measurement of Stimulated Sites on Arms and Legs95938 | 214 | $47 |
| Needle Measurement of Electrical Activity in Arm, Leg, Trunk Or Head Muscles, Limited Study95870 | 153 | $20 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 132 | $164 |
| Needle Measurement of Electrical Activity in Arm Or Leg Muscles, 2 Extremities |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$215 across 6 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-03-31
- Last updated
- 2020-03-02
- Certified
- 2020-03-02
Frequently asked questions
- What is Ha Nguyen's NPI number?
- Ha Nguyen's National Provider Identifier (NPI) is 1518256429, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ha Nguyen's specialty?
- Ha Nguyen is listed in the NPPES registry with a primary specialty of Neurological Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Ha Nguyen located?
- Ha Nguyen's practice location on file with NPPES is 227 W Janss Rd, Thousand Oaks, CA 91360-1856.
- What is Ha Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Ha Nguyen is (805) 372-1679.
- Does Ha Nguyen accept Medicare?
- Ha Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ha Nguyen's NPI active?
- Yes — Ha Nguyen's NPI (1518256429) is active in the NPPES registry as of the last update on 2020-03-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.