A chronic disease is a disease which can generally be treated with medication, but usually does not heal completely. A chronic disease does not necessarily lead to a restriction of social participation and has to meet certain exigencies to be categorized as a disability in accordance with the Sozialgesetzbuch IX. Buch (9th book in the Code of Social Law). However, some chronic diseases are stigmatized, leading to possible discrimination. The AGG does not specify whether it protects people with chronic diseases (without recognition of them as people with a disability).
It is accordingly recommended to add “chronic disease” as a ground for discrimination to the existing ground of “disability” in § 1 AGG.