Quick answers
- Which hospitals does Shamanthy Ratnasingam work at?
- Medicare's official clinician data lists Shamanthy Ratnasingam at 5 hospitals: Cayuga Medical Center at Ithaca, Good Samaritan Hospital Medical Center, Nicholas H Noyes Memorial Hospital, Peconic Bay Medical Center and St Anthony Community Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Shamanthy Ratnasingam see patients?
- Medicare's clinician data lists 7 practice locations, including Riverhead, NY, West Islip, NY and Dansville, NY. Call before your visit to confirm the address.
- What is Shamanthy Ratnasingam's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Shamanthy Ratnasingam accept Medicare assignment?
- Yes. Medicare's clinician data says Shamanthy Ratnasingam 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 Shamanthy Ratnasingam?
- (631) 548-6101, as listed in official Medicare / NPI Registry data.
- What is Shamanthy Ratnasingam's NPI number?
- 1184076507. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Shamanthy Ratnasingam works
Medicare's Facility Affiliation Data lists Shamanthy Ratnasingam at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Cayuga Medical Center at IthacaIthaca, NY · Acute Care Hospital · CCN 330307
- Good Samaritan Hospital Medical CenterWest Islip, NY · Acute Care Hospital · CCN 330286
- Nicholas H Noyes Memorial HospitalDansville, NY · Acute Care Hospital · CCN 330238
- Peconic Bay Medical CenterRiverhead, NY · Acute Care Hospital · CCN 330107
- St Anthony Community HospitalWarwick, NY · Acute Care Hospital · CCN 330205
Practice locations
Addresses where Shamanthy Ratnasingam is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 1 Heroes WayRiverhead, NY 11901 (631) 548‑6101
- 1000 Montauk HwyWest Islip, NY 11795 (631) 376‑3000
- 111 Clara Barton StDansville, NY 14437 (585) 335‑8639
- 300 Crystal Run RdMiddletown, NY 10941 (845) 692‑6999
- 310 Taughannock Blvd, Suite 4Ithaca, NY 14850 (607) 269‑0100
Group practices
Medicare enrollment lists Shamanthy Ratnasingam as a member of these groups (CMS data updated 2026-10-02).
- Crystal Run Healthcare Physicians LLP362 clinicians in the group
- Cayuga Medical Associates PC282 clinicians in the group
- Southwest Suffolk Medical PC199 clinicians in the group
- Nicholas H Noyes Memorial Hospital133 clinicians in the group
- St James Hospital124 clinicians in the group
- Central Suffolk Hospital95 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Riverhead
Clinicians with the same Medicare primary specialty in Riverhead, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2016 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1184076507 |
| 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