Coding and coverage · ICD-10-CM

F91 Conduct disorders

Not billable (header)Chapter 5

Report one of the more specific codes below.

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Codes under this one

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

Instructional notes

Chapter 5

Excludes2Not included here: the patient may have both; report both when both are present.
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Includes
  • disorders of psychological development

Section F90-F98

Notes
  • Codes within categories F90-F98 may be used regardless of the age of a patient. These disorders generally have onset within the childhood or adolescent years, but may continue throughout life or not be diagnosed until adulthood

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • antisocial behavior (Z72.81-)
  • antisocial personality disorder (F60.2)
Excludes2Not included here: the patient may have both; report both when both are present.
  • conduct problems associated with attention-deficit hyperactivity disorder (F90.-)
  • mood [affective] disorders (F30-F39)
  • pervasive developmental disorders (F84.-)
  • schizophrenia (F20.-)

Chapter 5: Mental, Behavioral and Neurodevelopmental disorders · F90-F98 Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.