ELINOR L BARON M.D.
NPI 1366537581
Internal Medicine - Infectious Disease in Newton, MA
About Elinor L Baron M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELINOR L BARON M.D. (NPI 1366537581) is an individual infectious disease provider in Newton, Massachusetts, licensed in Massachusetts (230261) and active in the NPI registry since October 2006. She is enrolled in Medicare PECOS, is affiliated with Newton-wellesley Hospital, and is a graduate of University Of Chicago, Pritzker School Of Medicine (2002).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
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
Elinor L Baron M.d. 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 Elinor Baron reassigns Medicare billing to 2 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
Cambridge, MA 02138
- Reassigned Medicare billing, Massachusetts enrollment
- 423 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
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Newton-Wellesley Hospital
Acute Care Hospitals · Newton, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02215 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Elinor Baron's NPI number?
The NPI number for Elinor Baron is 1366537581. It was assigned to this individual provider in the NPPES registry on October 4, 2006.
Where is Elinor Baron located?
Elinor Baron practices at 2000 Washington St, Suite 301 Newton Wellesley Hospital, Newton, MA 02215. The listed phone number is (617) 965-1717.
What is Elinor Baron's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Elinor Baron enrolled in Medicare?
Yes. Elinor Baron 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 Elinor Baron's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Elinor Baron reassigns Medicare benefits to 2 organizations: Mass General Brigham Medical Group Suburban Massachusetts Inc (Newton, MA) and Mount Auburn Professional Services Inc (Cambridge, 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 Elinor Baron's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Elinor Baron accept?
Health plans from Taro Health list Elinor Baron as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Elinor Baron affiliated with any hospitals?
According to CMS data, Elinor Baron is affiliated with Newton-Wellesley Hospital.
When was this NPI record last updated?
The NPPES record for Elinor Baron was last updated on August 31, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# Elinor L Baron, M.D. · NPI 1366537581
Infectious Disease physician in Newton, Massachusetts. Individual provider, active in the CMS NPPES registry since October 4, 2006.
## Identity
- **NPI:** 1366537581 (Entity type: Individual)
- **Enumerated:** October 4, 2006
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** 230261 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 2000 WASHINGTON ST, SUITE 301, NEWTON WELLESLEY HOSPITAL, Newton, MA 02215-1602
- **Phone:** (617) 965-1717
## 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): Mass General Brigham Medical Group Suburban Massachusetts Inc (NPI 1538191218, Newton, MA); Mount Auburn Professional Services Inc (NPI 1992750996, Cambridge, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Chicago, Pritzker School Of Medicine, class of 2002
## Record status
- **NPPES last updated:** August 31, 2009
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Source: [NPI Profile](https://npiprofile.com/npi/1366537581) · Data from the CMS NPPES public registry.