ICDwise
F91 ⚠ Non-billable

Conduct disorders

ICD-10-CM · FY2026 · Mental, Behavioral and Neurodevelopmental Disorders

Code
F91
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Mental, Behavioral and Neurodevelopmental Disorders
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Excludes1 — never code together
  • antisocial behavior (Z72.81-)
  • antisocial personality disorder (F60.2)
Excludes2 — not included here, but may code together
  • conduct problems associated with attention-deficit hyperactivity disorder (F90.-)
  • mood [affective] disorders (F30-F39)
  • pervasive developmental disorders (F84.-)
  • schizophrenia (F20.-)

Frequently asked questions

What is ICD-10 code F91?
ICD-10-CM code F91 represents Conduct disorders. It is a non-billable header code requiring a more specific subcategory in the Mental, Behavioral and Neurodevelopmental Disorders chapter, effective October 1, 2025 – September 30, 2026.
Is F91 billable?
No. F91 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is F91 in?
F91 belongs to the Mental, Behavioral and Neurodevelopmental Disorders chapter (F01–F99) of ICD-10-CM.

Related codes in the F91 category

F91.0 Conduct disorder confined to family context Billable F91.1 Conduct disorder, childhood-onset type Billable F91.2 Conduct disorder, adolescent-onset type Billable F91.3 Oppositional defiant disorder Billable F91.8 Other conduct disorders Billable F91.9 Conduct disorder, unspecified Billable

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