HCUP National Inpatient Database

The National (Nationwide) Inpatient Sample (NIS) is part of a family of databases and software tools developed for the Healthcare Cost and Utilization Project (HCUP). The NIS is the largest publicly available all-payer inpatient healthcare database.

全国住院患者样本（National (Nationwide) Inpatient Sample，简称NIS）是为医疗成本与利用项目（Healthcare Cost and Utilization Project，简称HCUP）开发的系列数据库与软件工具的组成部分。该样本是目前规模最大的公开可用全付费住院医疗数据库。