Final answer:
The National Practitioner Data Bank (NPDB) plays a vital role in quality improvement by reporting providers with adverse actions.
Step-by-step explanation:
The role of the National Practitioner Data Bank (NPDB) in quality improvement can be best described as reporting providers with adverse actions. The NPDB is a national database that collects and disseminates information about healthcare practitioners who have been subject to adverse actions, such as malpractice payments or license revocations. This information is then available to hospitals, healthcare organizations, and other entities to aid in making informed decisions about the qualifications and competence of healthcare providers.