DR. THOMAS C. CHEN M.D., PHD
NPI 1225071509
Neurological Surgery in Los Angeles, CA
About Dr. Thomas C. Chen M.d., Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. THOMAS C. CHEN M.D., PHD (NPI 1225071509) is an individual neurological surgery provider in Los Angeles, California, licensed in California (G66798) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS and is a graduate of University Of California, San Francisco School Of Medicine (1988).
NPPES Registry Identity
Specialties & Licenses
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. Thomas C. Chen M.d., Phd 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 Thomas Chen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90033
- Reassigned Medicare billing, California enrollment
- 2,445 clinicians in this Medicare group
Bakersfield, CA 93301
- Reassigned Medicare billing, California enrollment
- 10 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 3
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.
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.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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
LOS ANGELES, CA 90033
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 Thomas Chen's NPI number?
The NPI number for Thomas Chen is 1225071509. It was assigned to this individual provider in the NPPES registry on June 14, 2006.
Where is Thomas Chen located?
Thomas Chen practices at 1520 San Pablo St Ste 3800, Los Angeles, CA 90033. The listed phone number is (323) 442-5720.
What is Thomas Chen's specialty?
The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.
Is Thomas Chen enrolled in Medicare?
Yes. Thomas 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 organizations bill Medicare for Thomas Chen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Thomas Chen reassigns Medicare benefits to 2 organizations: Usc Care Medical Group, Inc (Los Angeles, CA) and Kern Neurosurgical Institute, Inc (Bakersfield, 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 Thomas 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 Thomas Chen was last updated on November 27, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. Thomas C. Chen, M.D., PHD · NPI 1225071509
Neurological Surgery physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since June 14, 2006.
## Identity
- **NPI:** 1225071509 (Entity type: Individual)
- **Enumerated:** June 14, 2006
- **Primary specialty:** Neurological Surgery · taxonomy 207T00000X
- **State license:** G66798 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1520 SAN PABLO ST, STE 3800, Los Angeles, CA 90033-5310
- **Phone:** (323) 442-5720 · **Fax:** (323) 442-7543
## 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): Usc Care Medical Group, Inc (NPI 1902846306, Los Angeles, CA); Kern Neurosurgical Institute, Inc (NPI 1659792158, Bakersfield, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Francisco School Of Medicine, class of 1988
## Record status
- **NPPES last updated:** November 27, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1225071509) · Data from the CMS NPPES public registry.