DIEM CHAU NGUYEN MD
NPI 1891221404
Psychiatry & Neurology - Psychiatry in Culver City, CA
About Diem Chau Nguyen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DIEM CHAU NGUYEN MD (NPI 1891221404) is an individual psychiatry provider in Culver City, California, licensed in California (A158446) and active in the NPI registry since May 2017. She is enrolled in Medicare PECOS, maintains a secondary practice location in Pasadena, and is a graduate of University Of California, Geffen School Of Medicine (2017).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Diem Chau Nguyen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Diem Chau Nguyen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Walnut Creek, CA 94597
- Reassigned Medicare billing, California enrollment
- 149 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90230 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Diem Chau Nguyen's NPI number?
The NPI number for Diem Chau Nguyen is 1891221404. It was assigned to this individual provider in the NPPES registry on May 3, 2017.
Where is Diem Chau Nguyen located?
Diem Chau Nguyen practices at 6167 Bristol Pkwy Ste 260, Culver City, CA 90230. The listed phone number is (424) 331-5604.
What is Diem Chau Nguyen's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is Diem Chau Nguyen enrolled in Medicare?
Yes. Diem Chau Nguyen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Diem Chau Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Diem Chau Nguyen reassigns Medicare benefits to Comprehensive Psychiatric Services, A Medical Group (Walnut Creek, CA). The 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 Diem Chau Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Diem Chau Nguyen was last updated on July 7, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Diem Chau Nguyen, MD · NPI 1891221404
Psychiatry physician in Culver City, California. Individual provider, active in the CMS NPPES registry since May 3, 2017.
## Identity
- **NPI:** 1891221404 (Entity type: Individual)
- **Enumerated:** May 3, 2017
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **State license:** A158446 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 6167 BRISTOL PKWY STE 260, Culver City, CA 90230-6616
- **Phone:** (424) 331-5604
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Comprehensive Psychiatric Services, A Medical Group (NPI 1184785834, Walnut Creek, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Geffen School Of Medicine, class of 2017
## Record status
- **NPPES last updated:** July 7, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1891221404) · Data from the CMS NPPES public registry.