Leo Mascarenhas, MD
NPI 1417057225 · Pediatric Hematology & Oncology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leo Mascarenhas, MD is a Pediatric Hematology & Oncology Physician provider in Los Angeles, CA (NPI 1417057225).
Provider details
- NPI number
- 1417057225
- Entity type
- Individual
- Primary specialty
- Pediatric Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A54324 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
4 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,885 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (3)
- 4650 W Sunset BlvdLos Angeles, CA 90027-6062Phone: (323) 669-2121Fax: (323) 600-7128
- 100 W California BlvdPasadena, CA 91105-3010Phone: (626) 397-5000
- 8700 Beverly BlvdWest Hollywood, CA 90048-1804Phone: (310) 423-4423Fax: (310) 423-4131
Registry dates
- Enumerated
- 2006-09-22
- Last updated
- 2025-07-23
- Certified
- 2025-07-23
Frequently asked questions
- What is Leo Mascarenhas's NPI number?
- Leo Mascarenhas's National Provider Identifier (NPI) is 1417057225, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leo Mascarenhas's specialty?
- Leo Mascarenhas is listed in the NPPES registry with a primary specialty of Pediatric Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Leo Mascarenhas located?
- Leo Mascarenhas's practice location on file with NPPES is 127 S San Vicente Blvd Fl 7, Los Angeles, CA 90048-3311.
- What is Leo Mascarenhas's phone number?
- The practice phone number listed in the NPPES registry for Leo Mascarenhas is (310) 423-4423.
- Does Leo Mascarenhas accept Medicare?
- Leo Mascarenhas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leo Mascarenhas's NPI active?
- Yes — Leo Mascarenhas's NPI (1417057225) is active in the NPPES registry as of the last update on 2025-07-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.