ESWAR SUNDAR M.D.
NPI 1689613671
Anesthesiology in Boston, MA
About Eswar Sundar M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ESWAR SUNDAR M.D. (NPI 1689613671) is an individual anesthesiology provider in Boston, Massachusetts, licensed in Massachusetts (213272) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Beth Israel Deaconess Medical Center, and is a graduate of Harvard Medical School (1979).
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
Eswar Sundar 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 Eswar Sundar reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- Also billed through NPI 1245773308 (Massachusetts)
- 1,006 clinicians in this Medicare group
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- Also billed through NPI 1093756629 (Massachusetts)
- 2,579 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 3
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.
Beth Israel Deaconess Medical Center
Acute Care Hospitals · Boston, MAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02215
BOSTON, MA 02215
BOSTON, MA 02215
BOSTON, MA 02215
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 Eswar Sundar's NPI number?
The NPI number for Eswar Sundar is 1689613671. It was assigned to this individual provider in the NPPES registry on June 5, 2006.
Where is Eswar Sundar located?
Eswar Sundar practices at 330 Brookline Ave Bidc. Dept Of Anes & Cc. St-308, Boston, MA 02215. The listed phone number is (617) 754-2675.
What is Eswar Sundar's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Eswar Sundar enrolled in Medicare?
Yes. Eswar Sundar 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 Eswar Sundar's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eswar Sundar reassigns Medicare benefits to 2 organizations: Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is (Boston, MA) and Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr 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 Eswar Sundar's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Eswar Sundar accept?
Health plans from Taro Health list Eswar Sundar 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 Eswar Sundar affiliated with any hospitals?
According to CMS data, Eswar Sundar is affiliated with Beth Israel Deaconess Medical Center.
When was this NPI record last updated?
The NPPES record for Eswar Sundar was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Eswar Sundar, M.D. · NPI 1689613671
Anesthesiology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since June 5, 2006.
## Identity
- **NPI:** 1689613671 (Entity type: Individual)
- **Enumerated:** June 5, 2006
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 213272 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 330 BROOKLINE AVE, BIDC. DEPT OF ANES & CC. ST-308, Boston, MA 02215-5400
- **Phone:** (617) 754-2675
## 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): Associated Physicians Of Harvard Medical Faculty Physicians At Beth Is (NPI 1861216038, Boston, MA); Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc (NPI 1194765438, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1979
## Record status
- **NPPES last updated:** July 13, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1689613671) · Data from the CMS NPPES public registry.