LESLIE BALLAS MD
NPI 1235388901
Radiology - Radiation Oncology in Los Angeles, CA
About Leslie Ballas Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LESLIE BALLAS MD (NPI 1235388901) is an individual radiation oncology provider in Los Angeles, California, licensed in California (A111990) and active in the NPI registry since September 2008. She is enrolled in Medicare PECOS, maintains a secondary practice location in West Hollywood, and is a graduate of University Of Michigan Medical School (2003).
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 and accepts Medicare assignment
Leslie Ballas Md 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 Leslie Ballas 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
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 15
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 90089 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 90089
LOS ANGELES, CA 90089
LOS ANGELES, CA 90089
LOS ANGELES, CA 90089
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 Leslie Ballas's NPI number?
The NPI number for Leslie Ballas is 1235388901. It was assigned to this individual provider in the NPPES registry on September 17, 2008.
Where is Leslie Ballas located?
Leslie Ballas practices at 1441 Eastlake Ave Nor G-350, Los Angeles, CA 90089. The listed phone number is (323) 865-3050.
What is Leslie Ballas's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is Leslie Ballas enrolled in Medicare?
Yes. Leslie Ballas 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 Leslie Ballas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leslie Ballas reassigns Medicare benefits to 2 organizations: Usc Care Medical Group, Inc (Los Angeles, CA) and Cedars-Sinai Medical Center (Los Angeles, 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 Leslie Ballas'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 Leslie Ballas was last updated on July 14, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Leslie Ballas, MD · NPI 1235388901
Radiation Oncology physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since September 17, 2008.
## Identity
- **NPI:** 1235388901 (Entity type: Individual)
- **Enumerated:** September 17, 2008
- **Primary specialty:** Radiology - Radiation Oncology · taxonomy 2085R0001X
- **State license:** A111990 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1441 EASTLAKE AVE, NOR G-350, Los Angeles, CA 90089-0112
- **Phone:** (323) 865-3050 · **Fax:** (323) 865-3000
## 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); Cedars-Sinai Medical Center (NPI 1639172372, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Michigan Medical School, class of 2003
## Record status
- **NPPES last updated:** July 14, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1235388901) · Data from the CMS NPPES public registry.