DR. STEPHEN SAM-FONG CHEN M.D.
NPI 1083844179
Internal Medicine in Downey, CA
About Dr. Stephen Sam-fong Chen M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. STEPHEN SAM-FONG CHEN M.D. (NPI 1083844179) is an individual internal medicine provider in Downey, California, licensed in California (A108952) and active in the NPI registry since July 2009. He is enrolled in Medicare PECOS and is a graduate of Other (2008).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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. Stephen Sam-fong Chen M.d. 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 Stephen Chen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Bellflower, CA 90706
- Reassigned Medicare billing, California enrollment
- 13,921 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 90242 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 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
DOWNEY, CA 90242
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 Stephen Chen's NPI number?
The NPI number for Stephen Chen is 1083844179. It was assigned to this individual provider in the NPPES registry on July 23, 2009.
Where is Stephen Chen located?
Stephen Chen practices at 9333 Imperial Highway, Downey, CA 90242. The listed phone number is (562) 657-9000.
What is Stephen Chen's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Stephen Chen enrolled in Medicare?
Yes. Stephen Chen 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 Stephen Chen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Chen reassigns Medicare benefits to Southern California Permanente Medical Group (Bellflower, 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 Stephen Chen'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 Stephen Chen was last updated on March 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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. Stephen Sam-Fong Chen, M.D. · NPI 1083844179
Internal Medicine physician in Downey, California. Individual provider, active in the CMS NPPES registry since July 23, 2009.
## Identity
- **NPI:** 1083844179 (Entity type: Individual)
- **Enumerated:** July 23, 2009
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A108952 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 9333 IMPERIAL HIGHWAY, Downey, CA 90242-2812
- **Phone:** (562) 657-9000
## 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:** Southern California Permanente Medical Group (NPI 1043242555, Bellflower, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2008
## Record status
- **NPPES last updated:** March 7, 2023
- **Other identifiers:** Other A108952 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1083844179) · Data from the CMS NPPES public registry.