Quick answers
- Which hospitals does Eleni Efstathiou work at?
- Medicare's official clinician data lists Eleni Efstathiou at 5 hospitals: Houston Methodist Baytown Hospital, Houston Methodist Clear Lake Hospital, Houston Methodist Hospital, Houston Methodist West Hospital and OHSU Hospital and Clinics. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Eleni Efstathiou see patients?
- Medicare's clinician data lists 7 practice locations, including Portland, OR, Bellaire, TX and Houston, TX. Call before your visit to confirm the address.
- What is Eleni Efstathiou's specialty?
- Medicare lists Medical Oncology as the primary specialty.
- Does Eleni Efstathiou accept Medicare assignment?
- Yes. Medicare's clinician data says Eleni Efstathiou accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Eleni Efstathiou offer telehealth?
- Medicare's clinician data says Eleni Efstathiou offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Eleni Efstathiou?
- (503) 494-8311, as listed in official Medicare / NPI Registry data.
- What is Eleni Efstathiou's NPI number?
- 1447654470. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Eleni Efstathiou works
Medicare's Facility Affiliation Data lists Eleni Efstathiou at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Houston Methodist Baytown HospitalBaytown, TX · Acute Care Hospital · CCN 450424
- Houston Methodist Clear Lake HospitalNassau Bay, TX · Acute Care Hospital · CCN 450709
- Houston Methodist HospitalHouston, TX · Acute Care Hospital · CCN 450358
- Houston Methodist West HospitalHouston, TX · Acute Care Hospital · CCN 670077
- OHSU Hospital and ClinicsPortland, OR · Acute Care Hospital · CCN 380009
Practice locations
Addresses where Eleni Efstathiou is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 3181 SW Sam Jackson Park RdPortland, OR 97239 (503) 494‑8311
- 4710 Bellaire BlvdBellaire, TX 77401 (713) 363‑9411
- 6445 Main StHouston, TX 77030
- 6445 Main St OpcHouston, TX 77030
- 6565 Fannin StHouston, TX 77030
Group practices
Medicare enrollment lists Eleni Efstathiou as a member of these groups (CMS data updated 2026-10-02).
- University Professional Services1,724 clinicians in the group
- TMH Physician Associates PLLC1,690 clinicians in the group
Specialties
- Medical Oncologyprimary
Other oncologists in Portland
Clinicians with the same Medicare primary specialty in Portland, OR — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1995 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1447654470 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians