Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Elena Nikou Theodosiou, MD

Individual provider Hematology & Oncology Physician · NPI 1891730982

Elena Nikou Theodosiou, MD is a Medical Oncology in Portsmouth, New Hampshire. Qualified in 1996, 30 years ago. Practices with St Peters Hospital of the City of Albany, a 268-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Maine, New Hampshire and New York.

Years since qualifying
30
Licensed in
ME, NH, NY
In the registry since
2006
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

155 Borthwick Ave Ste 301
Portsmouth, NH 03801-7156
Phone: (603) 433-5226
Fax: (603) 433-4939
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1300 Massachusetts Avenue, Troy, NY 12180-1628 — (518) 268-5060

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 16333 (NH)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence 016524 (ME)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence 290174 (NY)

Record details

NPI number1891730982
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 20, 2006
Last updated in NPPESJune 9, 2021
Certification dateMay 25, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyMEDICAL ONCOLOGY
Medical schoolOTHER
Graduated 1996 (30 years in practice)
Group practice St Peters Hospital Of The City Of Albany — 268 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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