Quick answers
- Where does Jarred E. Marshak see patients?
- Medicare's clinician data lists 2 practice locations, including Wantagh, NY. Call before your visit to confirm the address.
- What is Jarred E. Marshak's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Jarred E. Marshak accept Medicare assignment?
- Yes. Medicare's clinician data says Jarred E. Marshak 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 Jarred E. Marshak offer telehealth?
- Medicare's clinician data says Jarred E. Marshak offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Jarred E. Marshak?
- (516) 785-6800, as listed in official Medicare / NPI Registry data.
- What is Jarred E. Marshak's NPI number?
- 1538417027. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Jarred E. Marshak is enrolled with Medicare (CMS data updated 2026-10-02).
- 1488 Wantagh AveWantagh, NY 11793 (516) 785‑6800
- 2155 Wantagh AveWantagh, NY 11793 (516) 785‑6800
Group practices
Medicare enrollment lists Jarred E. Marshak as a member of this group (CMS data updated 2026-10-02).
- Gastrointestinal Care of Long Island PLLC183 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Wantagh
Clinicians with the same Medicare primary specialty in Wantagh, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2011 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1538417027 |
| 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
- 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