Quick answers
- Does Achraf A. Shamseddine accept Medicare assignment?
- Yes. Medicare's clinician data says Achraf A. Shamseddine accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Achraf A. Shamseddine see?
- In 2024, CMS data shows 531 Original Medicare patients and 2,785 services for Achraf A. Shamseddine. This counts Original Medicare only and measures volume, not quality.
- What is Achraf A. Shamseddine's NPI number?
- 1841722048. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Achraf A. Shamseddine, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 531 |
|---|---|
| Services billed to Medicare | 2,785 |
| Different services or procedures | 22 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy (G6002)1,348 services
- Calculation of radiation therapy dose (77300)290 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)267 services
- Radiation treatment management, 5 treatment sessions (77427)247 services
- Design and construction of complex radiation treatment device (77334)134 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)50%
- Arthritis49%
- Ischemic heart disease38%
- Anxiety31%
Hospitals where Achraf A. Shamseddine works
Medicare's Facility Affiliation Data lists Achraf A. Shamseddine at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- John T Mather Memorial Hospital of Port JeffersonPort Jefferson, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330185
- Suny/Stony Brook University HospitalStony Brook, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330393
Practice locations
Addresses where Achraf A. Shamseddine is enrolled with Medicare (CMS data updated October 2, 2026).
- 1101 Hempstead TpkeUniondale, NY 11553 (516) 559‑1000
- 1275 York AveNew York, NY 10065 (212) 639‑2000
- 500 Westchester AveWest Harrison, NY 10604 (914) 367‑7105
- 650 Commack RdCommack, NY 11725 (631) 623‑4300
Group practices
Medicare enrollment lists Achraf A. Shamseddine as a member of this group (CMS data updated October 2, 2026).
- Memorial Radiation Oncology Group92 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Uniondale
Clinicians with the same Medicare primary specialty in Uniondale, NY — not a recommendation.
Other clinicians in Memorial Radiation Oncology Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2017 (9 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1841722048 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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