DR. DOROTHY NGUYEN PSY.D.
NPI 1639312614
Psychologist - Clinical in Northridge, CA
About Dr. Dorothy Nguyen Psy.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DOROTHY NGUYEN PSY.D. (NPI 1639312614) is an individual clinical provider in Northridge, California, licensed in Colorado (103TC0700X) and active in the NPI registry since April 2009. She is enrolled in Medicare PECOS and is a graduate of Other (2012).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Dorothy Nguyen Psy.d. 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 Reassignments
3Medicare enrollment records show Dorothy Nguyen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
North Hills, CA 91343
- Reassigned Medicare billing, California enrollment
- 146 clinicians in this Medicare group
Montclair, CA 91763
- Reassigned Medicare billing, California enrollment
- 26 clinicians in this Medicare group
Upland, CA 91786
- Reassigned Medicare billing, California enrollment
- 76 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91325 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 20
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 Dorothy Nguyen's NPI number?
The NPI number for Dorothy Nguyen is 1639312614. It was assigned to this individual provider in the NPPES registry on April 7, 2009.
Where is Dorothy Nguyen located?
Dorothy Nguyen practices at 9650 Zelzah Ave, Northridge, CA 91325. The listed phone number is (818) 993-9311.
What is Dorothy Nguyen's specialty?
The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.
Is Dorothy Nguyen enrolled in Medicare?
Yes. Dorothy 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 organizations bill Medicare for Dorothy Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Dorothy Nguyen reassigns Medicare benefits to 3 organizations: Mission City Community Network, Inc. (North Hills, CA), One Health Center, Inc. (Montclair, CA) and Foothills Psychological Services, Inc. (Upland, CA). Each 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 Dorothy 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 Dorothy Nguyen was last updated on September 22, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Dr. Dorothy Nguyen, PSY.D. · NPI 1639312614
Clinical provider in Northridge, California. Individual provider, active in the CMS NPPES registry since April 7, 2009.
## Identity
- **NPI:** 1639312614 (Entity type: Individual)
- **Enumerated:** April 7, 2009
- **Primary specialty:** Psychologist - Clinical · taxonomy 103TC0700X
- **State license:** 103TC0700X (Colorado)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 9650 ZELZAH AVE, Northridge, CA 91325-2003
- **Phone:** (818) 993-9311
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Mission City Community Network, Inc. (NPI 1710370747, North Hills, CA); One Health Center, Inc. (NPI 1992679443, Montclair, CA); Foothills Psychological Services, Inc. (NPI 1336121888, Upland, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** September 22, 2014
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Source: [NPI Profile](https://npiprofile.com/npi/1639312614) · Data from the CMS NPPES public registry.