LEILA S YASSA M.D.
NPI 1649217340
Internal Medicine in Newton, MA
About Leila S Yassa M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LEILA S YASSA M.D. (NPI 1649217340) is an individual internal medicine provider in Newton, Massachusetts, licensed in Massachusetts (223290) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS.
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 (PECOS)
Leila S Yassa M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Leila Yassa reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Newton, MA 02462
- Reassigned Medicare billing, Massachusetts enrollment
- 992 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02462 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 2
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.
NEWTON, MA 02462
NEWTON, MA 02462
NEWTON, MA 02462
NEWTON, MA 02462
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 Leila Yassa's NPI number?
The NPI number for Leila Yassa is 1649217340. It was assigned to this individual provider in the NPPES registry on June 1, 2006.
Where is Leila Yassa located?
Leila Yassa practices at 2014 Washington St Newton-Wellesley Hospital, Green Bldg, Suite 460, Newton, MA 02462. The listed phone number is (617) 243-5812.
What is Leila Yassa's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Leila Yassa enrolled in Medicare?
Yes. Leila Yassa is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Leila Yassa's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leila Yassa reassigns Medicare benefits to 3 organizations: Mass General Brigham Medical Group Suburban Massachusetts Inc (Newton, MA), The General Hospital Corporation (Boston, MA) and Massachusetts General Physicians Organization Inc (Boston, MA). 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 Leila Yassa'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 Leila Yassa was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Leila S Yassa, M.D. · NPI 1649217340
Internal Medicine physician in Newton, Massachusetts. Individual provider, active in the CMS NPPES registry since June 1, 2006.
## Identity
- **NPI:** 1649217340 (Entity type: Individual)
- **Enumerated:** June 1, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 223290 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 2014 WASHINGTON ST, NEWTON-WELLESLEY HOSPITAL, GREEN BLDG, SUITE 460, Newton, MA 02462-1607
- **Phone:** (617) 243-5812
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Mass General Brigham Medical Group Suburban Massachusetts Inc (NPI 1538191218, Newton, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA); Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1649217340) · Data from the CMS NPPES public registry.