Callie Grenier, FNP-C
NPI 1275099723 · Family Nurse Practitioner · Chelmsford, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Callie Grenier, FNP-C is a Family Nurse Practitioner provider in Chelmsford, MA (NPI 1275099723).
Provider details
- NPI number
- 1275099723
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-C
- Sex
- Female
- Sole proprietor
- No
- License
- 061024-23 (NH)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
7 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,144 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 1,092 | $97 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 530 | $138 |
| Nursing Facility Discharge Management, More Than 30 Minutes99316 | 330 | $117 |
| Advance Care Planning, First 30 Minutes99497 | 160 | $67 |
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, 20 Minutes Or More99308 | 32 | $66 |
Typical Medicare-allowed amounts for these services range $66–$138 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Mirtazapine | 38 | 24 |
| Gabapentin | 31 | — |
| Rsvpref3 Antigen/As01e/Pfbrand: Arexvy | 31 | 31 |
| Furosemide | 28 | 18 |
| Levothyroxine Sodium | 28 | 16 |
| Atorvastatin Calcium | 25 | 16 |
| Lorazepam | 25 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$146 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2019-02-20
- Last updated
- 2025-05-28
- Certified
- 2025-05-28
Frequently asked questions
- What is Callie Grenier's NPI number?
- Callie Grenier's National Provider Identifier (NPI) is 1275099723, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Callie Grenier's specialty?
- Callie Grenier is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Callie Grenier located?
- Callie Grenier's practice location on file with NPPES is 290 Littleton Rd Unit 3, Chelmsford, MA 01824-3429.
- What is Callie Grenier's phone number?
- The practice phone number listed in the NPPES registry for Callie Grenier is (978) 685-2460.
- Does Callie Grenier accept Medicare?
- Callie Grenier is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Callie Grenier's NPI active?
- Yes — Callie Grenier's NPI (1275099723) is active in the NPPES registry as of the last update on 2025-05-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.