James Day, M.D.
NPI 1558892059 · Internal Medicine Physician · Pearl Harbor, HI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Day, M.D. is a Internal Medicine Physician provider in Pearl Harbor, HI (NPI 1558892059).
Provider details
- NPI number
- 1558892059
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD-P-2023-004 (GU)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
- Military Health Care Provider171000000X
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- U.S. Naval Hospital GuamFarenholt Ave, Bldg 50Agana Heights, GUAM 96910Phone: (671) 344-9340Fax: (671) 344-9441
Registry dates
- Enumerated
- 2017-03-26
- Last updated
- 2026-05-12
- Certified
- 2026-05-12
Frequently asked questions
- What is James Day's NPI number?
- James Day's National Provider Identifier (NPI) is 1558892059, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Day's specialty?
- James Day is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is James Day located?
- James Day's practice location on file with NPPES is 480 Central Ave, Pearl Harbor, HI 96860-4908.
- What is James Day's phone number?
- The practice phone number listed in the NPPES registry for James Day is (812) 319-2771.
- Does James Day accept Medicare?
- James Day is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Day's NPI active?
- Yes — James Day's NPI (1558892059) is active in the NPPES registry as of the last update on 2026-05-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.