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
MB26.0B — Misidentification delusion

ICD-11 MB26.0B — Misidentification delusion

A delusion that people in one’s environment, which may include family members and loved ones, are imposters or actors or are otherwise not who they seem to be.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.