ICD-11 classes
21 Symptoms, signs or clinical findings, not elsewhere...
Mental or behavioural symptoms, signs or clinical findings
MB26 — Symptoms or signs involving content of thought
MB26.0 — Delusion
MB26.03 — Delusion of reference

ICD-11 MB26.03 — Delusion of reference

A delusion that events, objects, or other people in the person's immediate environment have a particular and unusual personal significance, usually of a negative or pejorative nature.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.