Quick answers
- Which hospitals does Grant Hallock work at?
- Medicare's official clinician data lists Grant Hallock at 1 hospital: St Joseph Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Grant Hallock see patients?
- Medicare's clinician data lists 1 practice location in Nashua, NH. Call before your visit to confirm the address.
- What is Grant Hallock's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Grant Hallock accept Medicare assignment?
- Yes. Medicare's clinician data says Grant Hallock 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 Grant Hallock?
- (978) 519-4114, as listed in official Medicare / NPI Registry data.
- What is Grant Hallock's NPI number?
- 1225666357. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Grant Hallock works
Medicare's Facility Affiliation Data lists Grant Hallock at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- St Joseph HospitalNashua, NH · Acute Care Hospital · CCN 300011
Practice locations
Addresses where Grant Hallock is enrolled with Medicare (CMS data updated 2026-10-02).
- 166 Kinsley St, Suite 302Nashua, NH 03060 (978) 519‑4114
Group practices
Medicare enrollment lists Grant Hallock as a member of these groups (CMS data updated 2026-10-02).
- Incare LLC60 clinicians in the group
- Incare Tufts PLLC57 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Nashua
Clinicians with the same Medicare primary specialty in Nashua, NH — not a recommendation.
Clinician information
| Graduation year | 2020 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225666357 |
| 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