Elena Nikou Theodosiou, MD
Hematology & Oncology Physician · Portsmouth, NH
Elena Nikou Theodosiou, MD is a hematology & oncology physician with a practice address in Portsmouth, New Hampshire, and NPI 1891730982, issued on Jun 20, 2006. Check the license (New Hampshire 16333, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Elena Nikou Theodosiou
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- 16333 NH
016524 ME
290174 NY
Self-reported in NPPES; status is on the state search - Practice location
- 155 Borthwick Ave, Portsmouth, NH 03801
- Phone
- (603) 433-5226
- Enumerated
- Jun 20, 2006
- Record last updated
- Jun 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (603) 433-4939
- Medicaid ID
- 3092047 NH
- Medicare enrollment
- Enrolled (PECOS I20170913001180); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 76 in New Hampshire → Look up another NPI →
Also registered at 155 Borthwick Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Elena Nikou Theodosiou in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 16333Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
751 Medicare Part D claims for 136 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims. 42 claims were for opioids.
Most prescribed
- Anastrozole102 claims
- Prednisone64 claims
- Abiraterone Acetate61 claims
- Gabapentin53 claims
- Eliquis35 claims
- Tamoxifen Citrate33 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $90.38
4 payments; by number, the most common kind was food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- St Peters Hospital OF The City OF AlbanyAlbany, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Elena Nikou Theodosiou among 76 hematology & oncology physician records in New Hampshire
Elena Nikou Theodosiou, MD is one of 76 hematology & oncology physician records with a practice address in New Hampshire. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 45% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1996 · median 2001 among the 53 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in New Hampshire
There are 76 hematology & oncology physician records in New Hampshire.
All 76 in New Hampshire → Every provider in Portsmouth → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Wilhelmina Cabalona, MDPortsmouth, NH 038011265691927
- Yoko Fukuda, M.D.Portsmouth, NH 038011568622801
- Christine Wasilewski, MDPortsmouth, NH 038011376750562
- Amy Bessnow, MDDover, NH 038201083766786
- Archana Bhargava, MDDover, NH 038201366457004
- Prashant Shankar, MDDover, NH 038201164453395
- Henry Sonneborn, MDDover, NH 038201376508812
- Sergey Devitskiy, M.D.Lebanon, NH 037561629129747
Common questions
What is Elena Nikou Theodosiou, MD's NPI number?
Elena Nikou Theodosiou, MD's National Provider Identifier (NPI) is 1891730982, issued on Jun 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Elena Nikou Theodosiou, MD located?
The NPPES record lists a practice address at 155 Borthwick Ave, Portsmouth, NH, 03801. Phone: (603) 433-5226. Providers update this record themselves, so call before visiting.
How can I verify Elena Nikou Theodosiou, MD's license?
NPPES lists New Hampshire license number 16333, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Elena Nikou Theodosiou, MD prescribe under Medicare Part D?
In 2024, Elena Nikou Theodosiou, MD had 751 Medicare Part D claims for 136 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.