ICD-10 Code F90.9 – Attention-deficit hyperactivity disorder, unspecified type (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F90.9 – Attention-deficit hyperactivity disorder, unspecified type
What it is
This code identifies attention-deficit hyperactivity disorder when the record does not specify a predominantly inattentive, hyperactive, or combined presentation. Use it for a documented ADHD diagnosis with no subtype detail.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include inattention, impulsivity, restlessness, and difficulty sustaining attention or organizing tasks.
When to use this code
Use F90.9 when the clinician documents ADHD but does not name a specific type. It also fits when the subtype is unclear, not stated, or not supported in the available note. Check documentation before coding a more specific ADHD code.
Do not use for
Do not use this code if the chart clearly identifies another ADHD presentation, such as predominantly inattentive or combined type. Do not assign it for attention problems without a documented ADHD diagnosis.
Coding tip
If the subtype is missing, code only what is explicitly documented and query for clarification when needed.