Quick answers
- Which hospitals does Jack L. Brenner work at?
- Medicare's official clinician data lists Jack L. Brenner at 1 hospital: Northern Westchester Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jack L. Brenner see patients?
- Medicare's clinician data lists 2 practice locations, including Jefferson Valley, NY and Carmel, NY. Call before your visit to confirm the address.
- What is Jack L. Brenner's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Jack L. Brenner accept Medicare assignment?
- Yes. Medicare's clinician data says Jack L. Brenner 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 Jack L. Brenner?
- (914) 245-5400, as listed in official Medicare / NPI Registry data.
- What is Jack L. Brenner's NPI number?
- 1033287347. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jack L. Brenner works
Medicare's Facility Affiliation Data lists Jack L. Brenner at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northern Westchester HospitalMount Kisco, NY · Acute Care Hospital · CCN 330162
Practice locations
Addresses where Jack L. Brenner is enrolled with Medicare (CMS data updated 2026-10-02).
- 3630 Hill Blvd, Suite 103Jefferson Valley, NY 10535 (914) 245‑5400
- 667 Stoneleigh Ave, A201Carmel, NY 10512 (845) 278‑5223
Group practices
Medicare enrollment lists Jack L. Brenner as a member of this group (CMS data updated 2026-10-02).
- Westchester Putnam Gastroenterology PC14 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1970 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033287347 |
| 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