F91.1 — Conduct disorder, childhood-onset type
F91.1 is a billable, specific ICD-10-CM code for conduct disorder, childhood-onset type. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Unsocialized conduct disorder
- Conduct disorder, solitary aggressive type
- Unsocialized aggressive disorder
Excludes1 inherited from the categories above F91.1
These are not written on F91.1, but they bind it: a note on a category applies to every code beneath it. Billing F91.1 with anything listed here is a denial.
Excludes2 inherited from the categories above F91.1
Also inherited, and the opposite of Excludes1: these conditions are not part of F91.1, but a patient can have both, so you may code both.
Other codes that can never be billed with F91.1
These codes carry an Excludes1 note pointing at F91.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading F91.1 alone.
Risk adjustment
F91.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
F91.1 is named in 9 Medicare coverage policies — 8 listing it as supporting medical necessity, and 1 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52434Health and Behavior Assessment/Intervention – Medical Policy Articlenot covered
- A56850Billing and Coding: Psychiatric Partial Hospitalization Programs
- A56937Billing and Coding: Psychiatry and Psychology Services
- A57065Billing and Coding: Outpatient Psychiatry and Psychology Services
How F91.1 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to F91.1.
- Disorder›aggressive, unsocialized
- Disorder›unsocialized aggressive
- Disorder›conduct›childhood onset type
- Disorder›conduct›solitary aggressive type
- Disorder›conduct›unsocialized(aggressive)
- Disturbance›conduct›unsocialized
Code history
F91.1 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share F91. If F91.1 is not quite right, the correct code is usually one of these.
Questions about F91.1
- Is F91.1 a billable ICD-10-CM code?
- Yes. F91.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does F91.1 sit in the tabular list?
- Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98).
- What cannot be coded together with F91.1?
- F91.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above F91.1 (F91) and apply to it just the same.