Mary Elizabeth Massieu, DNP, FNP -C
NPI 1144644287ActiveIndividual· Nurse Practitioner, Family· Dewey, AZ
Nurse Practitioner, Family (DNP, FNP -C) with Carelock LLC, practicing in Dewey, Arizona. Their prescriptions cost Medicare Part D more than their services did: $310,513 for 4,534 claims, against $46,441 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 8 companies reporting payments in 2025, $501.08 in all, mostly food and beverage. Lists Yavapai Regional Medical Center as a hospital affiliation.
Overview
| NPI | 1144644287 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DNP, FNP -C |
| Sole proprietor | No |
| NPI issued | Feb 10, 2014 |
| Last updated in NPPES | Oct 19, 2024 |
| Certified by provider | Oct 19, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Family Primary | 363LF0000X | 226377 | AZ |
| Nurse Practitioner, Family | 363LF0000X | ARNP2936392 | FL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nurse Practitioner (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 212 |
|---|---|
| Services billed | 1,395 across 79 procedure codes |
| Paid by Medicare | $46,441 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,534 · 8,282 30-day fills |
|---|---|
| Patients | 690 |
| Total drug cost | $310,513 |
| Generic share | 90% of claims |
Education and affiliations
| Graduation year | 2006 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Carelock LLCPhoenix, AZ · 13 clinicians
Hospital affiliation
- Yavapai Regional Medical CenterPrescott, AZ
Industry payments (Open Payments)
- 2025$501.08 · 21 payments from 8 companies
- 2024$699.37 · 33 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $178.96 | 12 |
| Glaxosmithkline, LLC. | $124.99 | 1 |
| Indivior Inc. | $59.13 | 2 |
| Otsuka America Pharmaceutical, Inc. | $56.24 | 2 |
| Exact Sciences Corporation | $27.95 | 1 |
What the 2025 payments were for
- Food and Beverage$501.08 · 21 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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