ICD-10 Code F90.8 – Attention-deficit hyperactivity disorder, other type (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F90.8 – Attention-deficit hyperactivity disorder, other type
What it is
F90.8 identifies attention-deficit hyperactivity disorder that does not fit the more specific ADHD subtypes. Use it when the record documents ADHD, other type, or another specified ADHD presentation.
Clinical signs
Clinical features vary; refer to documentation. Typical ADHD findings may include inattention, impulsivity, and hyperactivity, but the chart should support the specific diagnosis recorded by the clinician.
When to use this code
Use this code when the provider documents ADHD, other type, and does not assign a more specific ADHD category. It may also apply when the note clearly identifies an atypical or unspecified subtype within ADHD. You should code from the documented diagnosis, not from isolated behavior alone.
Do not use for
Do not use F90.8 if the record supports a more specific ADHD code, such as another defined subtype. Do not assign it for simple distractibility, behavior problems, or school difficulty without a documented ADHD diagnosis.
Coding tip
Check the provider’s exact wording; if the subtype is not stated, verify whether a more specific ADHD code applies.