Quick answers
- Which hospitals does Derek Mattimoe work at?
- Medicare's official clinician data lists Derek Mattimoe at 2 hospitals: John T Mather Memorial Hospital of Port Jefferson and St Charles Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Derek Mattimoe see patients?
- Medicare's clinician data lists 1 practice location in Stony Brook, NY. Call before your visit to confirm the address.
- What is Derek Mattimoe's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Derek Mattimoe accept Medicare assignment?
- Yes. Medicare's clinician data says Derek Mattimoe 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 Derek Mattimoe offer telehealth?
- Medicare's clinician data says Derek Mattimoe offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Derek Mattimoe?
- (631) 751-3322, as listed in official Medicare / NPI Registry data.
- What is Derek Mattimoe's NPI number?
- 1164494613. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Derek Mattimoe works
Medicare's Facility Affiliation Data lists Derek Mattimoe at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- John T Mather Memorial Hospital of Port JeffersonPort Jefferson, NY · Acute Care Hospital · CCN 330185
- St Charles HospitalPort Jefferson, NY · Acute Care Hospital · CCN 330246
Practice locations
Addresses where Derek Mattimoe is enrolled with Medicare (CMS data updated 2026-10-02).
- 2500 Nesconset Hwy, Bldg 7dStony Brook, NY 11790 (631) 751‑3322
Group practices
Medicare enrollment lists Derek Mattimoe as a member of this group (CMS data updated 2026-10-02).
- CHS Physician Partners PC743 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Stony Brook
Clinicians with the same Medicare primary specialty in Stony Brook, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Columbia University College Of Physicians And Surgeons |
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1164494613 |
| 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