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
MB26.05 — Grandiose delusion

ICD-11 MB26.05 — Grandiose delusion

A delusion of inflated worth, power, knowledge, identity, or special relationship to a deity or famous person.

The diagnosis includes nothing.

It has no clarifying diagnoses.