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
MB26.6 — Overvalued ideas

ICD-11 MB26.6 — Overvalued ideas

Unreasonable and sustained beliefs that are maintained with less than delusional intensity (i.e., the person is able to acknowledge the possibility that the belief may not be true). An alternative use of this term is to refer to conventional or plausible thoughts (e.g., religious concepts, political ideas, or excessively idealistic beliefs) that are held with such a level of intensity so that the person's life is taken up by them.

The diagnosis includes nothing.

It has no clarifying diagnoses.