F22Delusional disorders

F22 is the ICD-10-CM diagnosis code for delusional disorders. It belongs to block F20-F29 (schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report F22 together with the conditions in its Excludes1 note: mood [affective] disorders with psychotic symptoms (F30.2, F31.2, F31.5, F31.64, F32.3, F33.3) and paranoid schizophrenia (F20.0).

The conditions in its Excludes2 note aren't part of F22, but may be coded alongside it if the patient has both: paranoid personality disorder (F60.0), paranoid psychosis, psychogenic (F23) and paranoid reaction (F23).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 885 (Psychoses, relative weight 1.3901), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 297.0 (paranoid state, simple), 297.1 (delusional disorder) and 297.2 (Paraphrenia).