Quick answers
- Which hospitals does James Day work at?
- Medicare's official clinician data lists James Day at 2 hospitals: Adventist Health Castle and Guam Regional Medical City. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does James Day see patients?
- Medicare's clinician data lists 1 practice location in Dededo, GU. Call before your visit to confirm the address.
- What is James Day's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does James Day accept Medicare assignment?
- Yes. Medicare's clinician data says James Day 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 James Day?
- (671) 645-5500, as listed in official Medicare / NPI Registry data.
- What is James Day's NPI number?
- 1558892059. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James Day works
Medicare's Facility Affiliation Data lists James Day at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health CastleKailua, HI · Acute Care Hospital · CCN 120006
- Guam Regional Medical CityDededo, GU · Acute Care Hospital · CCN 650003
Practice locations
Addresses where James Day is enrolled with Medicare (CMS data updated 2026-10-02).
- 133 Route 3Dededo, GU 96929 (671) 645‑5500
Group practices
Medicare enrollment lists James Day as a member of this group (CMS data updated 2026-10-02).
- Guam Healthcare Development Incorporated207 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Dededo
Clinicians with the same Medicare primary specialty in Dededo, GU — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 2017 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1558892059 |
| 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