ICD-11 classes
21 Symptoms, signs or clinical findings, not elsewhere...
Mental or behavioural symptoms, signs or clinical findings
MB25 — Symptoms or signs involving form of thought
MB25.0 — Symptoms and signs of thought disorder
MB25.01 — Tangentiality

ICD-11 MB25.01 — Tangentiality

A disturbance in the associative thought process typically manifest in speech in which the person tends to digress readily from the topic under discussion to other topics through associations without ever returning to the original topic.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.