MRS. MARGUERITE MARIE GUILLAUME NP
NPI 1982158515
Nurse Practitioner - Psychiatric/Mental Health in South Weymouth, MA
About Mrs. Marguerite Marie Guillaume Np NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MRS. MARGUERITE MARIE GUILLAUME NP (NPI 1982158515) is an individual psychiatric/mental health provider in South Weymouth, Massachusetts, licensed in Massachusetts (2279920) and active in the NPI registry since August 2016. She is enrolled in Medicare PECOS, is affiliated with South Shore Hospital, and maintains a secondary practice location in Brockton.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
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
Mrs. Marguerite Marie Guillaume Np 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
3Medicare enrollment records show Marguerite Guillaume reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Weymouth, MA 02190
- Reassigned Medicare billing, Massachusetts enrollment
- 671 clinicians in this Medicare group
Brockton, MA 02301
- Reassigned Medicare billing, Massachusetts enrollment
- 173 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 5
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.
South Shore Hospital
Acute Care Hospitals · South Weymouth, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02190 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.
WEYMOUTH, MA 02190
SOUTH WEYMOUTH, MA 02190
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 Marguerite Guillaume's NPI number?
The NPI number for Marguerite Guillaume is 1982158515. It was assigned to this individual provider in the NPPES registry on August 11, 2016.
Where is Marguerite Guillaume located?
Marguerite Guillaume practices at 55 Fogg Rd, South Weymouth, MA 02190. The listed phone number is (781) 624-8928.
What is Marguerite Guillaume's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.
Is Marguerite Guillaume enrolled in Medicare?
Yes. Marguerite Guillaume 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 Marguerite Guillaume's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marguerite Guillaume reassigns Medicare benefits to 3 organizations: Coastal Medical Associates (Weymouth, MA), Sound Physicians Of Massachusetts II 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 Marguerite Guillaume's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marguerite Guillaume accept?
Health plans from Anthem Blue Cross and Blue Shield, Harvard Pilgrim Health Care and Taro Health list Marguerite Guillaume 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 Marguerite Guillaume affiliated with any hospitals?
According to CMS data, Marguerite Guillaume is affiliated with South Shore Hospital.
When was this NPI record last updated?
The NPPES record for Marguerite Guillaume was last updated on March 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.
# Mrs. Marguerite Marie Guillaume, NP · NPI 1982158515
Psychiatric/Mental Health physician in South Weymouth, Massachusetts. Individual provider, active in the CMS NPPES registry since August 11, 2016.
## Identity
- **NPI:** 1982158515 (Entity type: Individual)
- **Enumerated:** August 11, 2016
- **Primary specialty:** Nurse Practitioner - Psychiatric/Mental Health · taxonomy 363LP0808X
- **State license:** 2279920 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 55 FOGG RD, South Weymouth, MA 02190-2432
- **Phone:** (781) 624-8928
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Coastal Medical Associates (NPI 1932175684, Weymouth, MA); Sound Physicians Of Massachusetts II PC (NPI 1306376397, Brockton, MA); Steward Medical Group, Inc (NPI 1629398219, Watertown, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** March 17, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1982158515) · Data from the CMS NPPES public registry.