Active NPI
Eleni Nicole Nackos, MD
- Hematology & Oncology Physician
- Westbrook, ME
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Hematology & Oncology Physician
- License
- MD21087
- Practice address
- 11 Rock Row Ste 320
Westbrook, ME 04092-4877 - Phone
- (207) 303-3300
- Fax
- (207) 250-2139
- NPI assigned
- Jun 16, 2010
- Sex
- Female
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Hematology & Oncology Physician | 207RH0003X | 20349 | NH | |
| Hematology & Oncology Physician | 207RH0003X | MD21087 | ME | Primary |
Addresses
Primary practice location
11 Rock Row Ste 320
Westbrook, ME 04092-4877
Mailing address
PO Box 911
Brattleboro, VT 05302-0911
Phone (207) 303-3200
Other practice location 1
2 Independence Dr
Kennebunk, ME 04043-6078
Phone (207) 303-3300
Other practice location 2
155 Borthwick Ave Ste C
Portsmouth, NH 03801-7156
Phone (603) 828-0100
Other practice location 3
11 Rock Row Ste 150
Westbrook, ME 04092-4877
Phone (207) 303-3300
Other practice location 4
11 Rock Row Ste 120
Westbrook, ME 04092-4877
Phone (207) 303-3300
Other practice location 5
105 Topsham Fair Mall Rd Unit 1
Topsham, ME 04086
Phone (207) 303-3300
Other practice location 6
15 Rock Row Ste 110
Westbrook, ME 04092-4877
Phone (207) 303-3300
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in ME, NH
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 2
Care Compare profile
Medicare Care Compare- Specialty
- Hematology/Oncology
- Education
- Other, 2010
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Telehealth
- Offers telehealth services
- Group practices
Practice addresses (Care Compare)
11 Rock Row
Suite 120
Westbrook, ME 04092-4877
Phone (207) 303-3300
155 Borthwick Ave
Suite C
Portsmouth, NH 03801-7156
Phone (603) 828-0100
Hospital & facility affiliations
- Mainehealth Maine Medical Center
- Northern Light Mercy Hospital
- Mainehealth Mid Coast Hospital
- Maine General Medical Center
- Mainehealth Stephens Hospital
Merit-based Incentive Payment System (MIPS)
- Final score
- 97.93 of 100
- Quality
- 83.31
- Promoting interoperability
- 100
- Improvement activities
- 40
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Maine Center for Cancer Medicine & Blood Disorders, P.a. | Internal Medicine | Current | Accepting new patients |
| Maine Center of Cancer Medicine & Blood Disorders | Hematology & Oncology | Past | Accepting new patients |
Locations
2 Independence Dr
Kennebunk, ME 04043
Phone (207) 303-3300
100 Campus Dr
Unit 108
Scarborough, ME 04074
Phone (207) 303-3300
105 Topsham Fair Mall Rd
Unit 1
Topsham, ME 04086
Phone (207) 303-3300
11 Rock Row
Ste 320
Westbrook, ME 04092
Phone (207) 303-3300
11 Rock Row
Ste 150
Westbrook, ME 04092
Phone (207) 303-3300
15 Rock Row
Ste 110
Westbrook, ME 04092
Phone (207) 303-3300
11 Rock Row
Ste 120
Westbrook, ME 04092
Phone (207) 303-3000
155 Borthwick Ave
Ste C
Portsmouth, NH 03801
Phone (603) 433-4961
Organizations & group practices 2
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Hematology & Oncology Physician
- Westbrook, ME
- NPI 1205896107
Internal Medicine, NH
-
- Hematology & Oncology Physician
- Scarborough, ME
- NPI 1528030814
Hospital & facility affiliations 40
Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.
-
- General Acute Care Hospital
- Scarborough, ME
- NPI 1053647024
-
- General Acute Care Hospital
- Portland, ME
- NPI 1346267879
-
- Critical Access Hospital
- Norway, ME
- NPI 1346299815
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1276646400000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1776643200000",
"number": "1023339819",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "PO BOX 911",
"city": "BRATTLEBORO",
"state": "VT",
"postal_code": "053020911",
"telephone_number": "207-303-3200",
"fax_number": "207-250-2140"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "11 ROCK ROW STE 320",
"city": "WESTBROOK",
"state": "ME",
"postal_code": "040924877",
"telephone_number": "207-303-3300",
"fax_number": "207-250-2139"
}
],
"practiceLocations": [
{
"address_1": "2 Independence Dr",
"address_purpose": "LOCATION",
"city": "Kennebunk",
"state": "ME",
"postal_code": "040436078",
"country_code": "US",
"telephone_number": "207-303-3300",
"fax_number": "207-250-2144",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "155 Borthwick Ave Ste C",
"address_purpose": "LOCATION",
"city": "Portsmouth",
"state": "NH",
"postal_code": "038017156",
"country_code": "US",
"telephone_number": "603-828-0100",
"fax_number": "603-828-0111",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "11 Rock Row Ste 150",
"address_purpose": "LOCATION",
"city": "Westbrook",
"state": "ME",
"postal_code": "040924877",
"country_code": "US",
"telephone_number": "207-303-3300",
"fax_number": "207-250-2139",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "11 Rock Row Ste 120",
"address_purpose": "LOCATION",
"city": "Westbrook",
"state": "ME",
"postal_code": "040924877",
"country_code": "US",
"telephone_number": "207-303-3300",
"fax_number": "207-250-2139",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "105 Topsham Fair Mall Rd Unit 1",
"address_purpose": "LOCATION",
"city": "Topsham",
"state": "ME",
"postal_code": "04086",
"country_code": "US",
"telephone_number": "207-303-3300",
"fax_number": "207-250-2137",
"country_name": "United States",
"address_type": "DOM"
},
{
"address_1": "15 Rock Row Ste 110",
"address_purpose": "LOCATION",
"city": "Westbrook",
"state": "ME",
"postal_code": "040924877",
"country_code": "US",
"telephone_number": "207-303-3300",
"country_name": "United States",
"address_type": "DOM"
}
],
"basic": {
"last_name": "NACKOS",
"first_name": "ELENI",
"middle_name": "NICOLE",
"name_prefix": "Dr.",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2010-06-16",
"last_updated": "2026-04-20",
"certification_date": "2026-04-20",
"status": "A"
},
"taxonomies": [
{
"code": "207RH0003X",
"taxonomy_group": "",
"desc": "Internal Medicine, Hematology & Oncology",
"state": "NH",
"license": "20349",
"primary": false
},
{
"code": "207RH0003X",
"taxonomy_group": "",
"desc": "Internal Medicine, Hematology & Oncology",
"state": "ME",
"license": "MD21087",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Westbrook, ME
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 20, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.