Quick answers
- Which hospitals does Andrew Athanassiou work at?
- Medicare's official clinician data lists Andrew Athanassiou at 1 hospital: Ns/Lij HS Southside Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Andrew Athanassiou see patients?
- Medicare's clinician data lists 2 practice locations, including Bethpage, NY and Uniondale, NY. Call before your visit to confirm the address.
- What is Andrew Athanassiou's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Andrew Athanassiou accept Medicare assignment?
- Yes. Medicare's clinician data says Andrew Athanassiou 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.
- What is the phone number for Andrew Athanassiou?
- (516) 938-0100, as listed in official Medicare / NPI Registry data.
- What is Andrew Athanassiou's NPI number?
- 1295189199. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Andrew Athanassiou works
Medicare's Facility Affiliation Data lists Andrew Athanassiou at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ns/Lij HS Southside HospitalBay Shore, NY · Acute Care Hospital · CCN 330043
Practice locations
Addresses where Andrew Athanassiou is enrolled with Medicare (CMS data updated 2026-10-02).
- 1055 Stewart AveBethpage, NY 11714 (516) 938‑0100
- 70 Charles Lindbergh Blvd, Suite 1Uniondale, NY 11553 (516) 483‑2020
Group practices
Medicare enrollment lists Andrew Athanassiou as a member of this group (CMS data updated 2026-10-02).
- Advantagecare Physicians PC303 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Bethpage
Clinicians with the same Medicare primary specialty in Bethpage, NY — not a recommendation.
Clinician information
| Graduation year | 2020 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1295189199 |
| 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