MARGARET LI-TING ONG MD
NPI 1033572987
Pediatrics in Boston, MA
About Margaret Li-ting Ong Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET LI-TING ONG MD (NPI 1033572987) is an individual pediatrics provider in Boston, Massachusetts, licensed in Massachusetts (278328) and active in the NPI registry since March 2016. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Margaret Li-ting Ong Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Margaret Ong reassigns Medicare billing to 2 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
- 4,574 clinicians in this Medicare group
Newton, MA 02462
- Reassigned Medicare billing, Massachusetts enrollment
- 992 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 02115 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 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 Margaret Ong's NPI number?
The NPI number for Margaret Ong is 1033572987. It was assigned to this individual provider in the NPPES registry on March 29, 2016. The provider is also known as Margarete Ong.
Where is Margaret Ong located?
Margaret Ong practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-6000.
What is Margaret Ong's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Margaret Ong enrolled in Medicare?
Yes. Margaret Ong is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Margaret Ong's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Ong reassigns Medicare benefits to 2 organizations: Brigham & Womens Physicians Organization Inc (Boston, MA) and Mass General Brigham Medical Group Suburban Massachusetts Inc (Newton, 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 Margaret Ong'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 Margaret Ong was last updated on May 8, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Margaret Li-Ting Ong, MD · NPI 1033572987
Pediatrics physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since March 29, 2016.
## Identity
- **NPI:** 1033572987 (Entity type: Individual)
- **Enumerated:** March 29, 2016
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 278328 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-6000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Brigham & Womens Physicians Organization Inc (NPI 1033535497, Boston, MA); Mass General Brigham Medical Group Suburban Massachusetts Inc (NPI 1538191218, Newton, MA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** May 8, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1033572987) · Data from the CMS NPPES public registry.