ICD-11 classes
21 Symptoms, signs or clinical findings, not elsewhere...
Mental or behavioural symptoms, signs or clinical findings
MB24 — Symptoms or signs involving mood or affect
MB24.4 — Apathy

ICD-11 MB24.4 — Apathy

A reduction or lack of feeling, emotion, interest, or concern; a state of indifference.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.