If you would like to volunteer your medical services in Kiribati, then Tarawa hospital in the capital is a good. Voice. There is also a medical facility in Kiritimati. Most people travel to tarawa for medical treatment.
Best contact details are listed below:
Ministry of Health and Medical Services
P.O. Box 268, Bikenibue (Nawerewere), Tawara, Kiribati
WHO Country Liaison Officer in Kiribati
World Health Organization
Nawerewere, Tarawa, Kiribati
P. O. Box 210,