AARON MATTHEW YIM MD
NPI 1881274744
Anesthesiology in Laguna Hills, CA
About Aaron Matthew Yim Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
AARON MATTHEW YIM MD (NPI 1881274744) is an individual anesthesiology provider in Laguna Hills, California, licensed in California (A192568) and active in the NPI registry since April 2021. He is enrolled in Medicare PECOS, maintains a secondary practice location in Arcadia, and is a graduate of Other (2021).
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
Aaron Matthew Yim 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 Reassignments
5Medicare enrollment records show Aaron Yim reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Laguna Hills, CA 92653
- Reassigned Medicare billing, California enrollment
- 833 clinicians in this Medicare group
Corona, CA 92882
- Reassigned Medicare billing, California enrollment
- 70 clinicians in this Medicare group
Riverside, CA 92506
- Reassigned Medicare billing, California enrollment
- 27 clinicians in this Medicare group
Long Beach, CA 90806
- Reassigned Medicare billing, California enrollment
- 107 clinicians in this Medicare group
Los Angeles, CA 90033
- Reassigned Medicare billing, California enrollment
- 2,445 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.
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.
LAGUNA HILLS, CA 92653
LAGUNA HILLS, CA 92653
LAGUNA HILLS, CA 92653
LAGUNA HILLS, CA 92653
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 Aaron Yim's NPI number?
The NPI number for Aaron Yim is 1881274744. It was assigned to this individual provider in the NPPES registry on April 13, 2021.
Where is Aaron Yim located?
Aaron Yim practices at 24451 Health Center Dr, Laguna Hills, CA 92653. The listed phone number is (949) 837-4500.
What is Aaron Yim's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Aaron Yim enrolled in Medicare?
Yes. Aaron Yim 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 Aaron Yim's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Aaron Yim reassigns Medicare benefits to 5 organizations: Cep America - Anesthesia PC (Laguna Hills, CA), Corona Anesthesia Group, Inc. (Corona, CA), Riverside Anesthesia Partners Inc (Riverside, CA), California Anesthesia Associates Medical Group, Inc. (Long Beach, CA) and Usc Care Medical Group, Inc (Los Angeles, 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 Aaron Yim'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 Aaron Yim was last updated on November 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Aaron Matthew Yim, MD · NPI 1881274744
Anesthesiology physician in Laguna Hills, California. Individual provider, active in the CMS NPPES registry since April 13, 2021.
## Identity
- **NPI:** 1881274744 (Entity type: Individual)
- **Enumerated:** April 13, 2021
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** A192568 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 24451 HEALTH CENTER DR, Laguna Hills, CA 92653-3689
- **Phone:** (949) 837-4500
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): Cep America - Anesthesia PC (NPI 1861373631, Laguna Hills, CA); Corona Anesthesia Group, Inc. (NPI 1558865840, Corona, CA); Riverside Anesthesia Partners Inc (NPI 1700694262, Riverside, CA); California Anesthesia Associates Medical Group, Inc. (NPI 1457399933, Long Beach, CA); Usc Care Medical Group, Inc (NPI 1902846306, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** November 11, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1881274744) · Data from the CMS NPPES public registry.