Caitlyn Elizabeth O'Brien, FNP-BC
NPI 1962100446ActiveIndividual· Nurse Practitioner, Family· Stoneham, MA
Nurse Practitioner, Family (FNP-BC) with Allergy and Asthma Physicians PC, practicing in Stoneham, Massachusetts. Their prescriptions cost Medicare Part D more than their services did: $53,597 for 136 claims, against $14,811 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 10 companies reporting payments in 2025, $2,251 in all, mostly food and beverage. Lists Winchester Hospital as a hospital affiliation.
Overview
| NPI | 1962100446 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | FNP-BC |
| Sole proprietor | No |
| NPI issued | Feb 23, 2023 |
| Last updated in NPPES | Nov 26, 2024 |
| Certified by provider | Nov 26, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Family Primary | 363LF0000X | RN2333093 | MA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nurse Practitioner (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 120 |
|---|---|
| Services billed | 1,699 across 14 procedure codes |
| Paid by Medicare | $14,811 |
Part D prescriptions in 2024
| Prescriptions (claims) | 136 · 166 30-day fills |
|---|---|
| Patients | 41 |
| Total drug cost | $53,597 |
| Generic share | 52% of claims |
Education and affiliations
| Graduation year | 2022 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Allergy and Asthma Physicians PCCambridge, MA · 5 clinicians
Hospital affiliation
- Winchester HospitalWinchester, MA
Industry payments (Open Payments)
- 2025$2,251 · 140 payments from 10 companies
- 2024$3,126 · 194 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $467.90 | 27 |
| Regeneron Healthcare Solutions, Inc. | $465.79 | 24 |
| Astrazeneca Pharmaceuticals LP | $342.51 | 27 |
| Novartis Pharmaceuticals Corporation | $245.38 | 17 |
| Genzyme Corporation | $229.09 | 17 |
What the 2025 payments were for
- Food and Beverage$2,210 · 138 payments
- Education$40.77 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other family nurse practitioners in Stoneham
- 1144516840
- 1407570070
- 1437768728
- 1518512250
- 1538705736
- 1184265381
- 1215411749
- 1407526858
- 1497719124
- 1194194126
- 1205677697
- 1326733320
All 17 family nurse practitioners in Stoneham · All family nurse practitioners in Massachusetts