Janet Ann Willemain , APRN
Nurse Practitioner • Florence, MA
10 Main St
Florence, MA 010623160
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Janet Willemain is listed in NPPES under Nurse Practitioner.
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NPI assigned on December 28, 2020; this date does not establish years in practice.
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Published CMS data list 154 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99204 — New patient outpatient office visit: 154 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See the full table · Guide: How to read Medicare Part B data
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Published CMS data list 869 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Famotidine — 359 prescription fills, including refills.
- Omeprazole — 352 prescription fills, including refills.
- Pantoprazole Sodium — 59 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 7 records in the table · Guide: How to read Medicare Part D prescriber data
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Fewer Medicare Part B services than 65% of clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,529 clinicians with data). Median for this group: 293. Middle half: 113 to 624.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 196 in 2021 to 154 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2021–2024.
Practice Location & Contact Primary Location
10 Main St
Florence, MA 010623160
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 2 distinct group names: Hampshire Gastroenterology Associates Llc; Mass General Brigham Medical Group Western Massachusetts Inc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
2020
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
162 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $22,162 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $17,020 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
1,708 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$58,364 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Open Payments general payments, program year 2023
All general payments: $121.62 across 5 records.
By nature of payment
- Food and Beverage: $121.62 across 5 records.
Reporting-company totals
- Bristol Myers Squibb Company: $68.47 across 4 records.
- ABBVIE INC.: $53.15 across 1 record.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2023 (published June 30, 2026).
Years since graduation
6 years (graduated 2020)
CMS Doctors and Clinicians data list 2020 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.
NPI first issued
2020
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, “Does your provider accept Medicare as full payment?”
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Enrolled in Medicare (PECOS)
Janet Willemain has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Janet Willemain as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Florence and Massachusetts
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Fewer Medicare Part B services than 65% of clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,529 clinicians with data). Median for this group: 293. Middle half: 113 to 624.
Too few clinicians listed under Nurse Practitioner in Florence have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
Close to the middle for clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,529 clinicians with data). Median for this group: $24,264. Middle half: $9,471 to $49,455.
Too few clinicians listed under Nurse Practitioner in Florence have Medicare Part B data for 2024 to compare.
Paid by Medicare
Close to the middle for clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,529 clinicians with data). Median for this group: $18,322. Middle half: $7,073 to $37,176.
Too few clinicians listed under Nurse Practitioner in Florence have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 70% of clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,582 clinicians with data). Median for this group: 327. Middle half: 88 to 1,074.
Too few clinicians listed under Nurse Practitioner in Florence have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 60% of clinicians listed under Nurse Practitioner in Massachusetts (2024, 1,582 clinicians with data). Median for this group: $25,505. Middle half: $1,753 to $161,728.
Too few clinicians listed under Nurse Practitioner in Florence have Medicare Part D data for 2024 to compare.
4 active clinicians are listed under Nurse Practitioner with a practice address in Florence, MA (3,509 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 21% from 196 in 2021 to 154 in 2024.
- 2021: 196
- 2022: 243
- 2024: 154
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Medicare-allowed amount
Medicare-allowed amount decreased 24% from $29,216 in 2021 to $22,162 in 2024.
- 2021: $29,216
- 2022: $35,497
- 2024: $22,162
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Paid by Medicare
Paid by Medicare decreased 24% from $22,381 in 2021 to $17,020 in 2024.
- 2021: $22,381
- 2022: $23,180
- 2024: $17,020
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 1604% from 51 in 2021 to 869 in 2024.
- 2021: 51
- 2022: 409
- 2023: 662
- 2024: 869
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30-day fills
30-day fills increased 1758% from 92 in 2021 to 1,708 in 2024.
- 2021: 92
- 2022: 754
- 2023: 1,172
- 2024: 1,708
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Part D drug cost
Part D drug cost went from $626 in 2021 to $58,364 in 2024.
- 2021: $626
- 2022: $7,658
- 2023: $36,389
- 2024: $58,364
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2023 only.
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2023), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2023 (payments made January 1 – December 31, 2023): fewer than 11 records totaling $121.62.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
SKYRIZI | General | $53.15 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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ZEPOSIA | General | $24.59 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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ZEPOSIA | General | $17.73 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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ZEPOSIA | General | $13.19 |
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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ZEPOSIA | General | $12.96 |
Source: CMS Open Payments, program year 2023, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2020–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2021–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
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154 | 154 | $471.50 | $143.91 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Famotidine | Famotidine | 359 | 20,323 | $4,362.41 | 105 |
| Omeprazole | Omeprazole | 352 | 23,640 | $4,521.62 | 120 |
| Pantoprazole Sodium | Pantoprazole Sodium | 59 | 3,710 | $757.75 | 23 |
| Gavilyte-G | Peg3350/Sod Sulf,bicarb,cl/Kcl | 50 | 57 | $769.90 | 49 |
| Linzess | Linaclotide | 18 | 720 | $12,633.05 | — |
| Creon | Lipase/Protease/Amylase | 16 | 626 | $35,134.68 | — |
| Sucralfate | Sucralfate | 15 | 417 | $184.45 | — |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2020-12-09NUCC Taxonomy Code: 363L00000X
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20210217000329
MA
6103231584
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026
Mass General Brigham Medical Group Western Massachusetts Inc
10 Denniston Pl, Northampton, MA 010602052
Phone: 4135869866
Mass General Brigham Medical Group Western Massachusetts Inc
30 Locust St, Northampton, MA 010602052
Hampshire Gastroenterology Associates Llc
10 Main St, Florence, MA 010623158
Phone: 4135868910
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.), Master of Science
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Nurse Practitioner
Nurse Practitioner
Career & Practice History
NPI enumerated December 28, 2020.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2021 to November 2026.
NPI Administrative Meta
Other Nurse Practitioners in Florence
Mailing Address
10 Main St
Florence, MA 010623160
Phone: 4135868910