ANDREW LAM-DINH NGUYEN MD
NPI 1659021269
Emergency Medicine in San Dimas, CA
About Andrew Lam-dinh Nguyen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ANDREW LAM-DINH NGUYEN MD (NPI 1659021269) is an individual emergency medicine provider in San Dimas, California, licensed in California (A201270) and active in the NPI registry since March 2022. He is enrolled in Medicare PECOS, is affiliated with Good Samaritan Hospital Medical Center, and maintains a secondary practice location in La Palma.
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
Andrew Lam-dinh 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 Reassignments
2Medicare enrollment records show Andrew Nguyen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Dimas, CA 91773
- Reassigned Medicare billing, California enrollment
- 75 clinicians in this Medicare group
La Palma, CA 90623
- Reassigned Medicare billing, California enrollment
- 62 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Good Samaritan Hospital Medical Center
Acute Care Hospitals · West Islip, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 91773 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.
SAN DIMAS, CA 91773
SAN DIMAS, CA 91773
SAN DIMAS, CA 91773
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 Andrew Nguyen's NPI number?
The NPI number for Andrew Nguyen is 1659021269. It was assigned to this individual provider in the NPPES registry on March 26, 2022.
Where is Andrew Nguyen located?
Andrew Nguyen practices at 1350 W Covina Blvd, San Dimas, CA 91773. The listed phone number is (909) 599-6811.
What is Andrew Nguyen's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Andrew Nguyen enrolled in Medicare?
Yes. Andrew 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 Andrew Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Andrew Nguyen reassigns Medicare benefits to 2 organizations: San Dimas Emergency Medical Associates Inc. (San Dimas, CA) and Orange County Emergency Medical Associates, Inc. (La Palma, 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 Andrew Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Andrew Nguyen affiliated with any hospitals?
According to CMS data, Andrew Nguyen is affiliated with Good Samaritan Hospital Medical Center.
When was this NPI record last updated?
The NPPES record for Andrew Nguyen was last updated on June 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Andrew Lam-Dinh Nguyen, MD · NPI 1659021269
Emergency Medicine physician in San Dimas, California. Individual provider, active in the CMS NPPES registry since March 26, 2022.
## Identity
- **NPI:** 1659021269 (Entity type: Individual)
- **Enumerated:** March 26, 2022
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A201270 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1350 W COVINA BLVD, San Dimas, CA 91773-3245
- **Phone:** (909) 599-6811
## 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): San Dimas Emergency Medical Associates Inc. (NPI 1720239460, San Dimas, CA); Orange County Emergency Medical Associates, Inc. (NPI 1508114711, La Palma, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York At Stony Brook, School Of Medicine, class of 2022
## Record status
- **NPPES last updated:** June 26, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1659021269) · Data from the CMS NPPES public registry.