Quick answers
- Where does Stephen T. Keithahn see patients?
- Medicare's clinician data lists 2 practice locations, including Waimanalo, HI. Call before your visit to confirm the address.
- What is Stephen T. Keithahn's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Stephen T. Keithahn accept Medicare assignment?
- Yes. Medicare's clinician data says Stephen T. Keithahn 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 Stephen T. Keithahn?
- (808) 259-7948, as listed in official Medicare / NPI Registry data.
- What is Stephen T. Keithahn's NPI number?
- 1235157827. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Stephen T. Keithahn is enrolled with Medicare (CMS data updated 2026-10-02).
- 41 1347 KalanianaoleWaimanalo, HI 96795
- 41-1347 Kalanianaole HwyWaimanalo, HI 96795 (808) 259‑7948
Group practices
Medicare enrollment lists Stephen T. Keithahn as a member of this group (CMS data updated 2026-10-02).
- Waimanalo Health Center26 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Hawaii
Clinicians with the same Medicare primary specialty in Hawaii — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Duke University School Of Medicine |
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235157827 |
| 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
- 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