DIANA DOAN-NGUYEN
NPI 1225792369
Nurse Practitioner - Family in Orange, CA
About Diana Doan-nguyen NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DIANA DOAN-NGUYEN (NPI 1225792369) is an individual family provider in Orange, California, licensed in California (95017996) and active in the NPI registry since October 2021. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Other (2021).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
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
Diana Doan-nguyen 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
2Medicare enrollment records show Diana Doan-nguyen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 219 clinicians in this Medicare group
Newport Beach, CA 92663
- Reassigned Medicare billing, California enrollment
- 529 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 5
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 92868 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.
ORANGE, CA 92868
ORANGE, CA 92868
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 Diana Doan-nguyen's NPI number?
The NPI number for Diana Doan-nguyen is 1225792369. It was assigned to this individual provider in the NPPES registry on October 25, 2021.
Where is Diana Doan-nguyen located?
Diana Doan-nguyen practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 456-5705.
What is Diana Doan-nguyen's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Diana Doan-nguyen enrolled in Medicare?
Yes. Diana Doan-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 Diana Doan-nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Diana Doan-nguyen reassigns Medicare benefits to 2 organizations: Regents Of The University Of (Orange, CA) and Hoag Clinic (Newport Beach, 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 Diana Doan-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 Diana Doan-nguyen was last updated on April 3, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 months 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.
# Diana Doan-Nguyen · NPI 1225792369
Family physician in Orange, California. Individual provider, active in the CMS NPPES registry since October 25, 2021.
## Identity
- **NPI:** 1225792369 (Entity type: Individual)
- **Enumerated:** October 25, 2021
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 95017996 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 101 THE CITY DR S, Orange, CA 92868-3201
- **Phone:** (714) 456-5705
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of (NPI 1154379394, Orange, CA); Hoag Clinic (NPI 1942799523, Newport Beach, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** April 3, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1225792369) · Data from the CMS NPPES public registry.