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MRS. CALLIE JEAN GRENIER FNP-C
NPI 1275099723
Nurse Practitioner - Family in Chelmsford, MA

Active since February 20, 2019PECOS EnrolledAccepts Medicare Assignment
290 LITTLETON RD UNIT 3, CHELMSFORD, MA 01824(978) 685-2460 Get Directions Write a Review

NPPES record last updated: May 28, 2025. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: May 28, 2025, Jan 11, 2023, Feb 20, 2019 (3 updates tracked since 2019).

About Mrs. Callie Jean Grenier Fnp-c NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MRS. CALLIE JEAN GRENIER FNP-C (NPI 1275099723) is an individual family provider in Chelmsford, Massachusetts, licensed in Massachusetts (RN2260921) and active in the NPI registry since February 2019. She is enrolled in Medicare PECOS and is a graduate of Other (2018).

NPPES Registry Identity

NPI1275099723
Entity TypeIndividualFemale
Primary Taxonomy363LF0000X
Provider Legal NameMRS. CALLIE JEAN GRENIERCredential: FNP-C
Location Address290 LITTLETON RD UNIT 3Chelmsford, MA 01824-3429
Mailing Address290 Littleton Rd Unit 3Chelmsford, MA 01824-3429 · (978) 685-2460
Phone(978) 685-2460
Sole ProprietorNo
Medical School CMSOtherGraduated 2018
Enumeration DateFebruary 20, 2019
Last NPPES UpdateMay 28, 20253 updates tracked since enumeration
NPPES CertifiedMay 28, 2025
✔ NPI 1275099723 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
Licenses✔ Licensed in MA · RN2260921✔ Licensed in NH · 061024-23
290 LITTLETON RD UNIT 3, Chelmsford, MA 01824
Open in Google Maps ↗

Other Names 1

Former Name (1)Callie Jean Smith

Other Identifiers 2

Other061024-23NH · Nh Aprn Fnp License #
Other061024-21NH · Nh Rn License #

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, WellSense Health Plan.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. Callie Jean Grenier Fnp-c 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.

PECOS PAC ID9234468356
PECOS Enrollment IDI20190913002343, I20211207001705
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

5

Medicare enrollment records show Callie Grenier reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Lawrence General Community Medical Service PLLC
Same address
Internal Medicine
290 LITTLETON RD UNIT 3
Chelmsford, MA 01824
  • Reassigned Medicare billing, Massachusetts and New Hampshire enrollments
  • 58 clinicians in this Medicare group
NPI 1174076418 (978) 685-2460
New England Community Medical Services PLLC
Same address
Internal Medicine
290 LITTLETON RD UNIT 3
Chelmsford, MA 01824
  • Reassigned Medicare billing, Massachusetts and New Hampshire enrollments
  • 57 clinicians in this Medicare group
NPI 1427376516 (978) 685-2460
Patriot Urgent Care Professionals, PC
8.5 mi
General Practice
154 GREAT ROAD
Bedford, MA 01730
  • Reassigned Medicare billing, Massachusetts enrollment
  • 38 clinicians in this Medicare group
NPI 1669950853 (781) 430-8161
Expressmed, LLC
24 mi
Urgent Care
1 HIGHLANDER WAY, SUITE 2
Manchester, NH 03103
  • Reassigned Medicare billing, New Hampshire enrollment
  • 14 clinicians in this Medicare group
NPI 1295856896 (603) 625-2622
Life Choice Hospice Of New Hampshire II, LLC
26 mi
Hospice and Palliative Medicine
170 S RIVER RD STE 2
Bedford, NH 03110
  • Reassigned Medicare billing, New Hampshire enrollment
  • 5 clinicians in this Medicare group
NPI 1891310462 (603) 606-7974

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.

Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes 99309
A follow-up nursing facility visit per day is a daily check-in by a healthcare professional. This 25-minute visit typically involves monitoring your health progress, addressing any concerns, and adjusting treatment plans as necessary. It's a vital part of ensuring your ongoing wellbeing.
1,092 services348 patients
Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes 99310
A follow-up nursing facility visit is a routine check-up that typically lasts about 35 minutes. During this visit, your health status is evaluated, any changes in your condition are noted, and necessary adjustments to your care plan are made. It's an essential part of maintaining your health.
530 services418 patients
Nursing facility discharge management, more than 30 minutes 99316
Nursing facility discharge management over 30 minutes is a comprehensive process where a healthcare team prepares you for leaving the facility. It involves creating a tailored plan, coordinating care, and ensuring a smooth transition to your next care setting.
330 services307 patients
Advance care planning, first 30 minutes 99497
Advance care planning is a process where you discuss your healthcare preferences with your doctor. This conversation, lasting up to 30 minutes, helps ensure your wishes are respected if you're unable to communicate them in the future. It's about your care, your way.
160 services147 patients
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308
A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.
32 services21 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01824 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$97.64 typical visit price
range $63.72 – $189.86
Typical copayment $24.41 (range $15.93 – $47.46)
Most-billed visit code 99203
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

JOE JOSEPH M.D.
Internal Medicine
290 LITTLETON RD UNIT 3
CHELMSFORD, MA 01824
Middlesex County (978) 685-2460
BRUCE PRIVATO NSUBUGA
Nurse Practitioner (Psychiatric/Mental Health)
290 LITTLETON RD UNIT 3
CHELMSFORD, MA 01824
Middlesex County (978) 685-2460
DR. DAGMARA OSMANSKA-JAC M.D
Internal Medicine
290 LITTLETON RD UNIT 3
CHELMSFORD, MA 01824
Middlesex County (978) 685-2460
ANITA KUMAR M.D.
Internal Medicine
290 LITTLETON RD UNIT 3
CHELMSFORD, MA 01824
Middlesex County (978) 685-2460
ANKIT PATEL M.D.
Internal Medicine
290 LITTLETON RD UNIT 3
CHELMSFORD, MA 01824
Middlesex County (978) 685-2460
NAUSHEEN HASSAN M.D.
Internal Medicine (Rheumatology)
290 LITTLETON RD UNIT 3
CHELMSFORD, MA 01824
Middlesex County (978) 685-2460
DR. JANARTHANAN SOMESWARANANTHAN MD
Internal Medicine
290 LITTLETON RD UNIT 3
CHELMSFORD, MA 01824
Middlesex County (978) 685-2460
ILIA MANEVICH M.D.
Internal Medicine
290 LITTLETON RD UNIT 3
CHELMSFORD, MA 01824
Middlesex County (978) 685-2460

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 Callie Grenier's NPI number?

The NPI number for Callie Grenier is 1275099723. It was assigned to this individual provider in the NPPES registry on February 20, 2019. The provider is also known as Callie Jean Smith.

Where is Callie Grenier located?

Callie Grenier practices at 290 Littleton Rd Unit 3, Chelmsford, MA 01824. The listed phone number is (978) 685-2460.

What is Callie Grenier's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Callie Grenier enrolled in Medicare?

Yes. Callie Grenier 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 Callie Grenier's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Callie Grenier reassigns Medicare benefits to 5 organizations: Lawrence General Community Medical Service PLLC (Chelmsford, MA), New England Community Medical Services PLLC (Chelmsford, MA), Patriot Urgent Care Professionals, PC (Bedford, MA), Expressmed, LLC (Manchester, NH) and Life Choice Hospice Of New Hampshire II, LLC (Bedford, NH). 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 Callie Grenier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Callie Grenier accept?

Health plans from Anthem Blue Cross and Blue Shield and WellSense Health Plan list Callie Grenier 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.

When was this NPI record last updated?

The NPPES record for Callie Grenier was last updated on May 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.