Quick answers
- Which hospitals does Daniel J. Haller work at?
- Medicare's official clinician data lists Daniel J. Haller at 2 hospitals: Mercy Medical Center and Mount Sinai South Nassau. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Daniel J. Haller see patients?
- Medicare's clinician data lists 2 practice locations, including Rockville Centre, NY. Call before your visit to confirm the address.
- What is Daniel J. Haller's specialty?
- Medicare lists General Surgery as the primary specialty, and also Critical Care (Intensivists).
- Does Daniel J. Haller accept Medicare assignment?
- Yes. Medicare's clinician data says Daniel J. Haller 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 Daniel J. Haller?
- (516) 900-7922, as listed in official Medicare / NPI Registry data.
- What is Daniel J. Haller's NPI number?
- 1366621898. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Daniel J. Haller works
Medicare's Facility Affiliation Data lists Daniel J. Haller at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Medical CenterRockville Centre, NY · Acute Care Hospital · CCN 330259
- Mount Sinai South NassauOceanside, NY · Acute Care Hospital · CCN 330198
Practice locations
Addresses where Daniel J. Haller is enrolled with Medicare (CMS data updated 2026-10-02).
- 2000 N Village AveRockville Centre, NY 11570 (516) 900‑7922
- 2000 N Village Ave, Suite 211Rockville Centre, NY 11570 (516) 900‑7922
Group practices
Medicare enrollment lists Daniel J. Haller as a member of these groups (CMS data updated 2026-10-02).
- Acute Care Medical Services PLLC8 clinicians in the group
- Long Island Surgical PLLC8 clinicians in the group
Specialties
- General Surgeryprimary
- Critical Care (Intensivists)also
Other general surgeons in Rockville Centre
Clinicians with the same Medicare primary specialty in Rockville Centre, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2006 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366621898 |
| 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