ELENA NIKOU THEODOSIOU MD
NPI 1891730982
Internal Medicine - Hematology & Oncology in Portsmouth, NH
About Elena Nikou Theodosiou Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELENA NIKOU THEODOSIOU MD (NPI 1891730982) is an individual hematology & oncology provider in Portsmouth, New Hampshire, licensed in New Hampshire (16333) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS, is affiliated with St Peter's Hospital, and maintains a secondary practice location in Troy.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Elena Nikou Theodosiou Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Elena Theodosiou reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Troy, NY 12180
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: St. Peter's Health Partners Medical Associates, P.C.
- 742 clinicians in this Medicare group
Troy, NY 12180
- Reassigned Medicare billing, New York enrollment
- 725 clinicians in this Medicare group
Rensselaer, NY 12144
- Reassigned Medicare billing, New York enrollment
- Medicare enrollment name: St Peters Hospital Of The City Of Albany
- 623 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Peter's Hospital
Acute Care Hospitals · Albany, NYSamaritan Hospital Of Troy, New York
Acute Care Hospitals · Troy, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 03801 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 4
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
PORTSMOUTH, NH 03801
PORTSMOUTH, NH 03801
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Elena Theodosiou's NPI number?
The NPI number for Elena Theodosiou is 1891730982. It was assigned to this individual provider in the NPPES registry on June 20, 2006.
Where is Elena Theodosiou located?
Elena Theodosiou practices at 155 Borthwick Ave Suite 301, Portsmouth, NH 03801. The listed phone number is (603) 433-5226.
What is Elena Theodosiou's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Elena Theodosiou enrolled in Medicare?
Yes. Elena Theodosiou is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Elena Theodosiou's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Elena Theodosiou reassigns Medicare benefits to 3 organizations: St Peters Health Partners Medical Associates, P.C. (Troy, NY), Samaritan Hospital Of Troy, New York (Troy, NY) and St. Peter's Hospital Of The City Of Albany (Rensselaer, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Elena Theodosiou's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Elena Theodosiou affiliated with any hospitals?
According to CMS data, Elena Theodosiou is affiliated with St Peter's Hospital and Samaritan Hospital Of Troy, New York.
When was this NPI record last updated?
The NPPES record for Elena Theodosiou was last updated on June 9, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Elena Nikou Theodosiou, MD · NPI 1891730982
Hematology & Oncology physician in Portsmouth, New Hampshire. Individual provider, active in the CMS NPPES registry since June 20, 2006.
## Identity
- **NPI:** 1891730982 (Entity type: Individual)
- **Enumerated:** June 20, 2006
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** 16333 (New Hampshire)
- **Sole proprietor:** No
## Practice location
- **Address:** 155 BORTHWICK AVE, SUITE 301, Portsmouth, NH 03801-7156
- **Phone:** (603) 433-5226 · **Fax:** (603) 433-4939
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): St Peters Health Partners Medical Associates, P.C. (NPI 1336575430, Troy, NY); Samaritan Hospital Of Troy, New York (NPI 1043267727, Troy, NY); St. Peter's Hospital Of The City Of Albany (NPI 1487725750, Rensselaer, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1996
## Record status
- **NPPES last updated:** June 9, 2021
- **Other identifiers:** Medicaid 3092047 (NH)
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Source: [NPI Profile](https://npiprofile.com/npi/1891730982) · Data from the CMS NPPES public registry.