MS. JANET ANN WILLEMAIN APRN
NPI 1275120156
Nurse Practitioner in Florence, MA
About Ms. Janet Ann Willemain Aprn NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. JANET ANN WILLEMAIN APRN (NPI 1275120156) is an individual nurse practitioner in Florence, Massachusetts, licensed in Massachusetts (RN282651) and active in the NPI registry since December 2020. She is enrolled in Medicare PECOS, is affiliated with Cooley Dickinson Hospital Inc,the, and is a graduate of Other (2020).
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
Ms. Janet Ann Willemain Aprn 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 Janet Willemain reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Florence, MA 01062
- Reassigned Medicare billing, Massachusetts enrollment
- 10 clinicians in this Medicare group
Northampton, MA 01060
- Reassigned Medicare billing, Massachusetts enrollment
- 539 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
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.
Cooley Dickinson Hospital Inc,the
Acute Care Hospitals · Northampton, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01062 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
FLORENCE, MA 01062
FLORENCE, MA 01062
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 Janet Willemain's NPI number?
The NPI number for Janet Willemain is 1275120156. It was assigned to this individual provider in the NPPES registry on December 28, 2020.
Where is Janet Willemain located?
Janet Willemain practices at 10 Main St, Florence, MA 01062. The listed phone number is (413) 586-8910.
What is Janet Willemain's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Janet Willemain enrolled in Medicare?
Yes. Janet Willemain 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 Janet Willemain's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Janet Willemain reassigns Medicare benefits to 2 organizations: Hampshire Gastroenterology Associates, LLC (Florence, MA) and Mass General Brigham Medical Group Western Massachusetts Inc (Northampton, 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 Janet Willemain's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Janet Willemain affiliated with any hospitals?
According to CMS data, Janet Willemain is affiliated with Cooley Dickinson Hospital Inc,the.
When was this NPI record last updated?
The NPPES record for Janet Willemain was last updated on December 28, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Ms. Janet Ann Willemain, APRN · NPI 1275120156
Nurse Practitioner physician in Florence, Massachusetts. Individual provider, active in the CMS NPPES registry since December 28, 2020.
## Identity
- **NPI:** 1275120156 (Entity type: Individual)
- **Enumerated:** December 28, 2020
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** RN282651 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 10 MAIN ST, Florence, MA 01062-3160
- **Phone:** (413) 586-8910 · **Fax:** (413) 584-7270
## 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): Hampshire Gastroenterology Associates, LLC (NPI 1144269077, Florence, MA); Mass General Brigham Medical Group Western Massachusetts Inc (NPI 1295787919, Northampton, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** December 28, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1275120156) · Data from the CMS NPPES public registry.