Quick answers
- Which hospitals does Caroline K. Messer work at?
- Medicare's official clinician data lists Caroline K. Messer at 2 hospitals: Hospital for Special Surgery and Suny/Stony Brook University Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Caroline K. Messer see patients?
- Medicare's clinician data lists 4 practice locations, including Lynbrook, NY, New Hyde Park, NY and Westbury, NY. Call before your visit to confirm the address.
- What is Caroline K. Messer's specialty?
- Medicare lists Endocrinology as the primary specialty, and also Internal Medicine.
- Does Caroline K. Messer accept Medicare assignment?
- Medicare's clinician data says Caroline K. Messer may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Caroline K. Messer's NPI number?
- 1386855047. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Caroline K. Messer works
Medicare's Facility Affiliation Data lists Caroline K. Messer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Hospital for Special SurgeryNew York, NY · Acute Care Hospital · CCN 330270
- Suny/Stony Brook University HospitalStony Brook, NY · Acute Care Hospital · CCN 330393
Practice locations
Addresses where Caroline K. Messer is enrolled with Medicare (CMS data updated 2026-10-02).
- 16 Atlantic AveLynbrook, NY 11563
- 1979 Marcus Ave, Suite C101New Hyde Park, NY 11040
- 1979 Marcus Ave, Suite C101New Hyde Park, NY 11042
- 972 Brush Hollow RdWestbury, NY 11590
Specialties
- Endocrinologyprimary
- Internal Medicinealso
Other endocrinologists in New York
Clinicians with the same Medicare primary specialty in New York — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Icahn School Of Medicine At Mount Sinai |
| Graduation year | 2005 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1386855047 |
| 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