LEO MASCARENHAS MD
NPI 1417057225
Pediatrics - Pediatric Hematology-Oncology in Los Angeles, CA
About Leo Mascarenhas Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LEO MASCARENHAS MD (NPI 1417057225) is an individual pediatric hematology-oncology provider in Los Angeles, California, licensed in California (A54324) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Other (1990).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 3
Other Identifiers 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
Leo Mascarenhas 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
4Medicare enrollment records show Leo Mascarenhas reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90048
- Reassigned Medicare billing, California enrollment
- 2,118 clinicians in this Medicare group
Los Angeles, CA 90048
- Reassigned Medicare billing, California enrollment
- 1,001 clinicians in this Medicare group
Los Angeles, CA 90034
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Los Angeles, CA 90027
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Childrens Hospital Los Angeles Medical Group Inc
- 1,281 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.
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 90048
LOS ANGELES, CA 90048
LOS ANGELES, CA 90048
LOS ANGELES, CA 90048
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 Leo Mascarenhas's NPI number?
The NPI number for Leo Mascarenhas is 1417057225. It was assigned to this individual provider in the NPPES registry on September 22, 2006.
Where is Leo Mascarenhas located?
Leo Mascarenhas practices at 127 S San Vicente Blvd Fl 7, Los Angeles, CA 90048. The listed phone number is (310) 423-4423.
What is Leo Mascarenhas's specialty?
The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Hematology-Oncology, with taxonomy code 2080P0207X.
Is Leo Mascarenhas enrolled in Medicare?
Yes. Leo Mascarenhas 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 Leo Mascarenhas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leo Mascarenhas reassigns Medicare benefits to 4 organizations: Cedars-Sinai Medical Care Foundation (Los Angeles, CA), Cedars-Sinai Medical Center (Los Angeles, CA), Southern California Permanente Medical Group (Los Angeles, CA) and Children's Hospital Los Angeles Medical Group, Inc. (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 Leo Mascarenhas'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 Leo Mascarenhas was last updated on July 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Leo Mascarenhas, MD · NPI 1417057225
Pediatric Hematology-Oncology physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since September 22, 2006.
## Identity
- **NPI:** 1417057225 (Entity type: Individual)
- **Enumerated:** September 22, 2006
- **Primary specialty:** Pediatrics - Pediatric Hematology-Oncology · taxonomy 2080P0207X
- **State license:** A54324 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 127 S SAN VICENTE BLVD FL 7, Los Angeles, CA 90048-3311
- **Phone:** (310) 423-4423 · **Fax:** (310) 423-4131
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Cedars-Sinai Medical Care Foundation (NPI 1043826720, Los Angeles, CA); Cedars-Sinai Medical Center (NPI 1639172372, Los Angeles, CA); Southern California Permanente Medical Group (NPI 1043242563, Los Angeles, CA); Children's Hospital Los Angeles Medical Group, Inc. (NPI 1265530653, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1990
## Record status
- **NPPES last updated:** July 23, 2025
- **Other identifiers:** Other 00A543240 G15 (CA); Medicaid 00A54324A (CA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1417057225) · Data from the CMS NPPES public registry.