F91.1
Conduct disorder, childhood-onset type
F91.1 (also written F911) is a billable ICD-10-CM diagnosis code for conduct disorder, childhood-onset type. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 6 codes in category F91 (Conduct disorders). The Alphabetic Index lists it under 6 entries. Its coding notes include 2 Excludes1 entries and 5 Excludes2 entries.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the Behavioral Health clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026IPF Primary
IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:
| MS-DRG | Description | Factor |
|---|---|---|
| 886 | Behavioral & developmental disorders | 1.07 |
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (1 note)
- disorders of psychological development
Inclusion terms
Conditions classified to this code.
- Unsocialized conduct disorder
- Conduct disorder, solitary aggressive type
- Unsocialized aggressive disorder
Notes
Also from chapter/block level (1 note)
- 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
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 6 entries