MARGARET WILLIAMS
NPI 1912692559
Social Worker in Boston, MA
About Margaret Williams NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET WILLIAMS (NPI 1912692559) is an individual social worker in Boston, Massachusetts, licensed in Massachusetts (226435) and active in the NPI registry since April 2023. She is enrolled in Medicare PECOS.
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 (PECOS)
Margaret Williams is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Margaret Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Norwalk, CT 06854
- Reassigned Medicare billing, Connecticut enrollment
- 60 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.
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 02114
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
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 Williams's NPI number?
The NPI number for Margaret Williams is 1912692559. It was assigned to this individual provider in the NPPES registry on April 10, 2023.
Where is Margaret Williams located?
Margaret Williams practices at 15 Parkman St, Boston, MA 02114. The listed phone number is (617) 724-9115.
What is Margaret Williams's specialty?
The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.
Is Margaret Williams enrolled in Medicare?
Yes. Margaret Williams is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Margaret Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Williams reassigns Medicare benefits to Norwalk Community Health Center Inc (Norwalk, CT). The 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 Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret Williams accept?
Health plans from Anthem Blue Cross and Blue Shield list Margaret Williams 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.
When was this NPI record last updated?
The NPPES record for Margaret Williams was last updated on April 10, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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 Williams · NPI 1912692559
Social Worker provider in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 10, 2023.
## Identity
- **NPI:** 1912692559 (Entity type: Individual)
- **Enumerated:** April 10, 2023
- **Primary specialty:** Social Worker · taxonomy 104100000X
- **State license:** 226435 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 15 PARKMAN ST, Boston, MA 02114-3117
- **Phone:** (617) 724-9115
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Norwalk Community Health Center Inc (NPI 1841226347, Norwalk, CT), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 10, 2023
---
Source: [NPI Profile](https://npiprofile.com/npi/1912692559) · Data from the CMS NPPES public registry.