Barbara O'Callaghan, RN, NP
NPI 1003041104ActiveIndividual· Registered Nurse, Oncology· Lawrenceville, GA
Registered Nurse, Oncology (RN, NP) with North Atlanta Oncology Services LLC, practicing in Lawrenceville, Georgia. Their prescriptions cost Medicare Part D more than their services did: $275,260 for 624 claims, against $27,017 paid for services in 2024. Merck Sharp & Dohme LLC was the largest of 22 companies reporting payments in 2025, $1,092 in all, mostly food and beverage. Lists Northside Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1003041104 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | RN, NP |
| Sole proprietor | No |
| NPI issued | May 19, 2009 |
| Last updated in NPPES | Feb 3, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Registered Nurse, Oncology Primary | 163WX0200X | RN139570 | GA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nurse Practitioner (GA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 171 |
|---|---|
| Services billed | 531 across 11 procedure codes |
| Paid by Medicare | $27,017 |
Part D prescriptions in 2024
| Prescriptions (claims) | 624 · 1,187 30-day fills |
|---|---|
| Patients | 156 |
| Total drug cost | $275,260 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2008 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- North Atlanta Oncology Services LLCDacula, GA · 29 clinicians
Hospital affiliations
- Northside HospitalAtlanta, GA
- Northside Hospital DuluthDuluth, GA
Industry payments (Open Payments)
- 2025$1,092 · 43 payments from 22 companies
- 2024$1,615 · 68 payments from 28 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $121.72 | 4 |
| Novartis Pharmaceuticals Corporation | $102.33 | 4 |
| Daiichi Sankyo Inc. | $92.95 | 4 |
| Genentech USA, Inc. | $76.17 | 3 |
| Pfizer Inc. | $71.81 | 3 |
What the 2025 payments were for
- Food and Beverage$1,092 · 43 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Registered Nurse, Oncology providers in Lawrenceville
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