MARGARET-MARY WILLIAMS MD
NPI 1992792055
Internal Medicine in Brockton, MA
About Margaret-mary Williams Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET-MARY WILLIAMS MD (NPI 1992792055) is an individual internal medicine provider in Brockton, Massachusetts, licensed in Massachusetts (71259) and active in the NPI registry since October 2005. She is enrolled in Medicare PECOS, is affiliated with Morton Hospital, and is a graduate of Albany Medical College Of Union University (1987).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
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
Margaret-mary Williams Md 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 Margaret-mary Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Brockton, MA 02301
- Reassigned Medicare billing, Massachusetts enrollment
- 264 clinicians in this Medicare group
Watertown, MA 02472
- Reassigned Medicare billing, Massachusetts enrollment
- 1,103 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Morton Hospital
Acute Care Hospitals · Taunton, MAGood Samaritan Medical Center
Acute Care Hospitals · Brockton, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02301 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 7
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
BROCKTON, MA 02301
BROCKTON, MA 02301
BROCKTON, MA 02301
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-mary Williams's NPI number?
The NPI number for Margaret-mary Williams is 1992792055. It was assigned to this individual provider in the NPPES registry on October 4, 2005.
Where is Margaret-mary Williams located?
Margaret-mary Williams practices at 1 Pearl St Suite 1400, Brockton, MA 02301. The listed phone number is (508) 897-6200.
What is Margaret-mary Williams's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Margaret-mary Williams enrolled in Medicare?
Yes. Margaret-mary Williams 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 Margaret-mary Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret-mary Williams reassigns Medicare benefits to 2 organizations: Revere Medical Of Massachusetts, PC (Brockton, MA) and Steward Medical Group, Inc (Watertown, 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-mary Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret-mary Williams accept?
Health plans from Anthem Blue Cross and Blue Shield and Taro Health list Margaret-mary 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.
Is Margaret-mary Williams affiliated with any hospitals?
According to CMS data, Margaret-mary Williams is affiliated with Morton Hospital and Good Samaritan Medical Center.
When was this NPI record last updated?
The NPPES record for Margaret-mary Williams was last updated on January 21, 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.
# Margaret-Mary Williams, MD · NPI 1992792055
Internal Medicine physician in Brockton, Massachusetts. Individual provider, active in the CMS NPPES registry since October 4, 2005.
## Identity
- **NPI:** 1992792055 (Entity type: Individual)
- **Enumerated:** October 4, 2005
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 71259 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 PEARL ST, SUITE 1400, Brockton, MA 02301-2864
- **Phone:** (508) 897-6200 · **Fax:** (508) 897-6321
## 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): Revere Medical Of Massachusetts, PC (NPI 1336976539, Brockton, MA); Steward Medical Group, Inc (NPI 1629398219, Watertown, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Albany Medical College Of Union University, class of 1987
## Record status
- **NPPES last updated:** January 21, 2011
- **Other identifiers:** Medicare UPIN E75680; Medicaid 3074749 (MA); Medicare ID-Type Unspecified J11620 (MA)
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Source: [NPI Profile](https://npiprofile.com/npi/1992792055) · Data from the CMS NPPES public registry.