MARYELLEN SUN M.D.
NPI 1861661092
Radiology - Diagnostic Radiology in Boston, MA
About Maryellen Sun M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARYELLEN SUN M.D. (NPI 1861661092) is an individual diagnostic radiology provider in Boston, Massachusetts, licensed in Massachusetts (234487) and active in the NPI registry since February 2008. She is enrolled in Medicare PECOS, is affiliated with Mount Auburn Hospital, and is a graduate of Harvard Medical School (2002).
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 and accepts Medicare assignment
Maryellen Sun 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
5Medicare enrollment records show Maryellen Sun reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- Medicare enrollment name: President & Fellows Of Harvard College
- 170 clinicians in this Medicare group
Cambridge, MA 02142
- Reassigned Medicare billing, Massachusetts enrollment
- 119 clinicians in this Medicare group
Cambridge, MA 02138
- Reassigned Medicare billing, Massachusetts and Rhode Island enrollments
- 24 clinicians in this Medicare group
Boston, MA 02109
- Reassigned Medicare billing, Massachusetts enrollment
- 350 clinicians in this Medicare group
Lowell, MA 01854
- Reassigned Medicare billing, Massachusetts enrollment
- 93 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 13
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.
Mount Auburn Hospital
Acute Care Hospitals · Cambridge, 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.
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.
BOSTON, MA 02215
BOSTON, MA 02215
BOSTON, MA 02215
BOSTON, MA 02215
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 Maryellen Sun's NPI number?
The NPI number for Maryellen Sun is 1861661092. It was assigned to this individual provider in the NPPES registry on February 21, 2008.
Where is Maryellen Sun located?
Maryellen Sun practices at Beth Israel Deaconess Medical Center 330 Brookline Avenue, Boston, MA 02215. The listed phone number is (617) 754-2521.
What is Maryellen Sun's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is Maryellen Sun enrolled in Medicare?
Yes. Maryellen Sun 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 Maryellen Sun's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maryellen Sun reassigns Medicare benefits to 5 organizations: President And Fellows Of Harvard College (Boston, MA), Massachusetts Institute Of Technology (Cambridge, MA), Schatzki Associates Inc. (Cambridge, MA), Mass General Brigham Community Physicians Inc. (Boston, MA) and Merrimack Radiology-Cra LLC (Lowell, 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 Maryellen Sun's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Maryellen Sun affiliated with any hospitals?
According to CMS data, Maryellen Sun is affiliated with Mount Auburn Hospital.
When was this NPI record last updated?
The NPPES record for Maryellen Sun was last updated on August 2, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Maryellen Sun, M.D. · NPI 1861661092
Diagnostic Radiology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since February 21, 2008.
## Identity
- **NPI:** 1861661092 (Entity type: Individual)
- **Enumerated:** February 21, 2008
- **Primary specialty:** Radiology - Diagnostic Radiology · taxonomy 2085R0202X
- **State license:** 234487 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** BETH ISRAEL DEACONESS MEDICAL CENTER, 330 BROOKLINE AVENUE, Boston, MA 02215
- **Phone:** (617) 754-2521
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): President And Fellows Of Harvard College (NPI 1972761807, Boston, MA); Massachusetts Institute Of Technology (NPI 1346308723, Cambridge, MA); Schatzki Associates Inc. (NPI 1245384114, Cambridge, MA); Mass General Brigham Community Physicians Inc. (NPI 1265094122, Boston, MA); Merrimack Radiology-Cra LLC (NPI 1275871154, Lowell, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 2002
## Record status
- **NPPES last updated:** August 2, 2011
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Source: [NPI Profile](https://npiprofile.com/npi/1861661092) · Data from the CMS NPPES public registry.