JUSTIN TAM SIU MD
NPI 1407542467
Family Medicine in Los Angeles, CA
About Justin Tam Siu Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JUSTIN TAM SIU MD (NPI 1407542467) is an individual family medicine provider in Los Angeles, California, licensed in California (A198786) and active in the NPI registry since April 2023. He is enrolled in Medicare PECOS, maintains a secondary practice location in Santa Monica, and is a graduate of Other (2023).
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 (PECOS)
Justin Tam Siu Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Justin Siu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Los Angeles, CA 90095
- Reassigned Medicare billing, California enrollment
- 1,766 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 90033 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.
LOS ANGELES, CA 90033
LOS ANGELES, CA 90033
LOS ANGELES, CA 90033
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 Justin Siu's NPI number?
The NPI number for Justin Siu is 1407542467. It was assigned to this individual provider in the NPPES registry on April 13, 2023.
Where is Justin Siu located?
Justin Siu practices at 1520 San Pablo St Ste 1300, Los Angeles, CA 90033. The listed phone number is (323) 442-5900.
What is Justin Siu's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Justin Siu enrolled in Medicare?
Yes. Justin Siu is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Justin Siu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Justin Siu reassigns Medicare benefits to The Regents Of The University Of California (Los Angeles, 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 Justin Siu'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 Justin Siu was last updated on July 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Justin Tam Siu, MD · NPI 1407542467
Family Medicine physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since April 13, 2023.
## Identity
- **NPI:** 1407542467 (Entity type: Individual)
- **Enumerated:** April 13, 2023
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** A198786 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1520 SAN PABLO ST STE 1300, Los Angeles, CA 90033-5312
- **Phone:** (323) 442-5900
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** The Regents Of The University Of California (NPI 1235107566, Los Angeles, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2023
## Record status
- **NPPES last updated:** July 9, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1407542467) · Data from the CMS NPPES public registry.