F91Header code — not billable

Conduct disorders

Chapter
5. Mental, Behavioral and Neurodevelopmental disorders
Category
F91
Effective date
October 1, 2026

Related codes in category F91

F91.0Conduct disorder confined to family contextYesF91.1Conduct disorder, childhood-onset typeYesF91.2Conduct disorder, adolescent-onset typeYesF91.3Oppositional defiant disorderYesF91.8Other conduct disordersYesF91.9Conduct disorder, unspecifiedYes

Frequently asked questions

What is ICD-10 code F91?

F91 is an ICD-10-CM diagnosis code for Conduct disorders.

Is F91 a billable code?

No. F91 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is F91 in?

F91 falls under Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

When did F91 become effective?

F91 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to F91?

F91 belongs to category F91, which includes 6 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.