DR. REX TONG HYUN CHUNG M.D.
NPI 1003021882
Surgery - Surgical Critical Care in Loma Linda, CA
About Dr. Rex Tong Hyun Chung M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. REX TONG HYUN CHUNG M.D. (NPI 1003021882) is an individual surgical critical care provider in Loma Linda, California, licensed in California (A99992) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS and is a graduate of Icahn School Of Medicine At Mount Sinai (2005).
NPPES Registry Identity
Specialties & Licenses 2
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. Rex Tong Hyun Chung 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 Rex Chung reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Los Angeles, CA 90048
- Reassigned Medicare billing, California enrollment
- 1,001 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.
Areas of Expertise CMS Part B claims 7
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
LOMA LINDA, CA 92350
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 Rex Chung's NPI number?
The NPI number for Rex Chung is 1003021882. It was assigned to this individual provider in the NPPES registry on May 14, 2007.
Where is Rex Chung located?
Rex Chung practices at 11175 Campus St Rm 21008, Loma Linda, CA 92350. The listed phone number is (909) 558-8131.
What is Rex Chung's specialty?
The primary specialty registered for this NPI is Surgery, specializing in Surgical Critical Care, with taxonomy code 2086S0102X.
Is Rex Chung enrolled in Medicare?
Yes. Rex Chung 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 Rex Chung's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Rex Chung reassigns Medicare benefits to Cedars-Sinai Medical Center (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 Rex Chung'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 Rex Chung was last updated on March 23, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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. Rex Tong Hyun Chung, M.D. · NPI 1003021882
Surgical Critical Care physician in Loma Linda, California. Individual provider, active in the CMS NPPES registry since May 14, 2007.
## Identity
- **NPI:** 1003021882 (Entity type: Individual)
- **Enumerated:** May 14, 2007
- **Primary specialty:** Surgery - Surgical Critical Care · taxonomy 2086S0102X
- **State license:** A99992 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 11175 CAMPUS ST, RM 21008, Loma Linda, CA 92350-1700
- **Phone:** (909) 558-8131
## 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:** Cedars-Sinai Medical Center (NPI 1639172372, Los Angeles, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Icahn School Of Medicine At Mount Sinai, class of 2005
## Record status
- **NPPES last updated:** March 23, 2016
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Source: [NPI Profile](https://npiprofile.com/npi/1003021882) · Data from the CMS NPPES public registry.