DR. KASEY SIU DO
NPI 1447811559
Internal Medicine in Downey, CA
About Dr. Kasey Siu Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KASEY SIU DO (NPI 1447811559) is an individual internal medicine provider in Downey, California, licensed in California (20A20152) and active in the NPI registry since June 2019. She is enrolled in Medicare PECOS and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses
Group Practice 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
Dr. Kasey Siu Do 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 Reassignment
Medicare enrollment records show Kasey Siu reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Downey, CA 90241
- Reassigned Medicare billing, California enrollment
- 840 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 90241 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.
DOWNEY, CA 90241
DOWNEY, CA 90241
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 Kasey Siu's NPI number?
The NPI number for Kasey Siu is 1447811559. It was assigned to this individual provider in the NPPES registry on June 28, 2019.
Where is Kasey Siu located?
Kasey Siu practices at 11500 Brookshire Ave, Downey, CA 90241. The listed phone number is (562) 904-5000.
What is Kasey Siu's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Kasey Siu enrolled in Medicare?
Yes. Kasey Siu 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 organization bills Medicare for Kasey Siu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kasey Siu reassigns Medicare benefits to Pih Health Physicians (Downey, 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 Kasey 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 Kasey Siu was last updated on October 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.
# Dr. Kasey Siu, DO · NPI 1447811559
Internal Medicine physician in Downey, California. Individual provider, active in the CMS NPPES registry since June 28, 2019.
## Identity
- **NPI:** 1447811559 (Entity type: Individual)
- **Enumerated:** June 28, 2019
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 20A20152 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 11500 BROOKSHIRE AVE, Downey, CA 90241-4917
- **Phone:** (562) 904-5000
## 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:** Pih Health Physicians (NPI 1447931506, Downey, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** October 10, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1447811559) · Data from the CMS NPPES public registry.