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

Other providers in Chelmsford