Quick answers
- Which hospitals does James G. Ryan work at?
- Medicare's official clinician data lists James G. Ryan at 1 hospital: St Catherine of Siena Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does James G. Ryan see patients?
- Medicare's clinician data lists 1 practice location in Smithtown, NY. Call before your visit to confirm the address.
- What is James G. Ryan's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does James G. Ryan accept Medicare assignment?
- Yes. Medicare's clinician data says James G. Ryan 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 James G. Ryan?
- (240) 686-2300, as listed in official Medicare / NPI Registry data.
- What is James G. Ryan's NPI number?
- 1881608446. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James G. Ryan works
Medicare's Facility Affiliation Data lists James G. Ryan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St Catherine of Siena HospitalSmithtown, NY · Acute Care Hospital · CCN 330401
Practice locations
Addresses where James G. Ryan is enrolled with Medicare (CMS data updated 2026-10-02).
- 50 Route 25aSmithtown, NY 11787 (240) 686‑2300
Group practices
Medicare enrollment lists James G. Ryan as a member of this group (CMS data updated 2026-10-02).
- Siena Emergency Medical Services PC14 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Smithtown
Clinicians with the same Medicare primary specialty in Smithtown, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | State University Of New York Downstate Medical Center |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1881608446 |
| 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