HA SON NGUYEN MD
NPI 1437782398
Neurological Surgery in Thousand Oaks, CA
About Ha Son Nguyen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HA SON NGUYEN MD (NPI 1437782398) is a healthcare organization registered as a neurological surgery in Thousand Oaks, California and active in the NPI registry since February 2020. The organization lists Ha Son Nguyen, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Ha Son Nguyen Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Ha Son Nguyen MD, which bills Medicare for the services this clinician delivers.
Clinician (1)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Ha Son Nguyen MD's NPI number?
The NPI number for Ha Son Nguyen MD is 1437782398. It was assigned to this organization in the NPPES registry on February 19, 2020.
Where is Ha Son Nguyen MD located?
Ha Son Nguyen MD is located at 227 W Janss Rd Ste 125, Thousand Oaks, CA 91360. The listed phone number is (805) 372-1679.
What is Ha Son Nguyen MD's specialty?
The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.
Is Ha Son Nguyen MD enrolled in Medicare?
Yes. Ha Son Nguyen MD is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Ha Son Nguyen MD?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Neurosurgery) reassigns their Medicare billing to Ha Son Nguyen MD. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Ha Son Nguyen MD was last updated on February 19, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.