ICD-10-CM
ICD-10 code for Untruthfulness, child problem: F91.8
The ICD-10-CM index points "Untruthfulness, child problem" to F91.8, Other conduct disorders. F91.8 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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