Stoma is defined by the Dutch Health and Care Information models (Dutch: Zorginformatiebouwsteen or ZIB) version 3.2, release 2017.

A stoma is an unnatural, surgically created opening connecting a body cavity with the outside world. A stoma is created e.g. as an exit opening for feces or urine in the event that they cannot leave the body naturally. In the case of a tracheostomy, the stoma is intended to facilitate breathing if that is no longer possible via the oral, nasal and throat cavity.