Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Mrs. Callie Jean Grenier, FNP-C

Individual provider Family Nurse Practitioner · NPI 1275099723

Mrs. Callie Jean Grenier, FNP-C is a Nurse Practitioner in Chelmsford, Massachusetts. Qualified in 2018, 8 years ago. Practices with Lawrence General Community Medical Service PLLC, a 53-clinician group and accepts Medicare assignment. Licensed in Massachusetts and New Hampshire.

Years since qualifying
8
Licensed in
MA, NH
In the registry since
2019
Specialties on file
2
What do these letters mean?
FNP-C — Family Nurse Practitioner, Certified
A family nurse practitioner certified by the AANP.

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Practice location Address checks out

290 Littleton Rd Unit 3
Chelmsford, MA 01824-3429
Phone: (978) 685-2460
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence RN2260921 (MA)
Family Nurse Practitioner Taxonomy 363LF0000X · Licence 061024-23 (NH)

Record details

NPI number1275099723
Entity typeIndividual (Type 1)
GenderFemale
Credentials FNP-C
Sole proprietorNo
NPI enumeratedFebruary 20, 2019
Last updated in NPPESMay 28, 2025
Certification dateMay 28, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2018 (8 years in practice)
Group practice Lawrence General Community Medical Service Pllc — 53 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients484
Services billed 2,151 a service is one billed item, such as a visit, a test or a procedure
Average patient age84

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $19 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Lawrence General Community Medical Service PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 53 clinicians in the practice; 12 are shown here.

Other providers in Chelmsford