Eleni Nicole Nackos, MD
NPI 1023339819ActiveIndividual· Internal Medicine, Hematology & Oncology· Westbrook, ME
Internal Medicine, Hematology & Oncology (MD) with Maine Center for Cancer Medicine and Blood Disorders PA, practicing in Westbrook, Maine. Their prescriptions cost Medicare Part D more than their services did: $3,124,614 for 1,754 claims, against $1,382,228 paid for services in 2024. Daiichi Sankyo Inc. was the largest of 12 companies reporting payments in 2025, $1,024 in all, mostly consulting fees. Lists Mainehealth Maine Medical Center and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1023339819 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 16, 2010 |
| Last updated in NPPES | Apr 20, 2026 |
| Certified by provider | Apr 20, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | MD21087 | ME |
| Internal Medicine, Hematology & Oncology | 207RH0003X | 20349 | NH |
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 - Hematology/Oncology (ME); Practitioner - Hematology/Oncology (NH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 406 |
|---|---|
| Services billed | 65,702 across 139 procedure codes |
| Paid by Medicare | $1,382,228 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,754 · 3,512 30-day fills |
|---|---|
| Patients | 373 |
| Total drug cost | $3,124,614 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 2010 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Maine Center for Cancer Medicine and Blood Disorders PAWestbrook, ME · 70 clinicians
Hospital affiliations
- Mainehealth Maine Medical CenterPortland, ME
- Mainehealth Mid Coast HospitalBrunswick, ME
- Mainehealth Stephens HospitalNorway, ME
- Northern Light Mercy HospitalPortland, ME
Industry payments (Open Payments)
- 2025$1,024 · 21 payments from 12 companies
- 2024$3,485 · 6 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Daiichi Sankyo Inc. | $586.28 | 3 |
| Abbvie Inc. | $135.29 | 4 |
| Astrazeneca Pharmaceuticals LP | $93.57 | 4 |
| Astellas Pharma US Inc | $31.60 | 1 |
| Novartis Pharmaceuticals Corporation | $29.76 | 2 |
What the 2025 payments were for
- Consulting Fee$555.00 · 1 payment
- Food and Beverage$468.55 · 20 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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