AJA WEI LOO
NPI 1871123323
Social Worker - Clinical in Irvine, CA
About Aja Wei Loo NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
AJA WEI LOO (NPI 1871123323) is an individual clinical provider in Irvine, California, licensed in California (138322) and active in the NPI registry since January 2020. She is enrolled in Medicare PECOS and is a graduate of Other (2022).
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 (PECOS)
Aja Wei Loo is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Aja Loo reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Santa Ana, CA 92701
- Reassigned Medicare billing, California enrollment
- 8 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 92614 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Aja Loo's NPI number?
The NPI number for Aja Loo is 1871123323. It was assigned to this individual provider in the NPPES registry on January 23, 2020.
Where is Aja Loo located?
Aja Loo practices at 18012 Cowan, Irvine, CA 92614. The listed phone number is (714) 989-6019.
What is Aja Loo's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Aja Loo enrolled in Medicare?
Yes. Aja Loo is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Aja Loo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Aja Loo reassigns Medicare benefits to Besa Health Yang P.C. (Santa Ana, 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 Aja Loo'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 Aja Loo was last updated on June 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Aja Wei Loo · NPI 1871123323
Clinical provider in Irvine, California. Individual provider, active in the CMS NPPES registry since January 23, 2020.
## Identity
- **NPI:** 1871123323 (Entity type: Individual)
- **Enumerated:** January 23, 2020
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** 138322 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 18012 COWAN, Irvine, CA 92614-6800
- **Phone:** (714) 989-6019
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Besa Health Yang P.C. (NPI 1336949254, Santa Ana, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2022
## Record status
- **NPPES last updated:** June 23, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1871123323) · Data from the CMS NPPES public registry.