F91.1Conduct disorder, childhood-onset type

F91.1 is the ICD-10-CM diagnosis code for conduct disorder, childhood-onset type. It belongs to category F91 (conduct disorders), block F90-F98 (behavioral and emotional disorders with onset usually occurring in childhood and adolescence) 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.

Within F91 (conduct disorders), F91.1 is specifically for conduct disorder, childhood-onset type. Related codes cover conduct disorder confined to family context (F91.0), conduct disorder, adolescent-onset type (F91.2), Oppositional defiant disorder (F91.3), other conduct disorders (F91.8) and conduct disorder, unspecified (F91.9).

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 886 (Behavioral and Developmental Disorders, relative weight 1.8678), 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 312.00 (Undersocialized conduct disorder, aggressive type, unspecified) and 312.81 (conduct disorder, childhood onset type).