ICD-10 Code F90.0 – Attention-deficit hyperactivity disorder, predominantly inattentive type (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F90.0 – Attention-deficit hyperactivity disorder, predominantly inattentive type
What it is
F90.0 identifies attention-deficit hyperactivity disorder, predominantly inattentive type. Use it for a documented pattern of inattention that interferes with functioning, with fewer hyperactive or impulsive symptoms than other ADHD presentations.
Clinical signs
Common findings include poor sustained attention, careless mistakes, disorganization, forgetfulness, and difficulty following instructions. Clinical features vary; refer to documentation for the full symptom pattern and functional impact.
When to use this code
Use F90.0 when the provider documents ADHD, predominantly inattentive type, or clearly describes an inattentive presentation of ADHD. Apply it when the record supports a chronic attention problem affecting school, work, or daily tasks.
If the note does not specify the subtype, check documentation before coding. Use the code only when the diagnosis is established and not merely suspected or under evaluation.
Do not use for
Do not use this code for isolated distractibility from stress, sleep loss, anxiety, or another condition. Do not assign it when documentation supports a different ADHD presentation or the subtype is not confirmed.
Coding tip
Code from the provider’s stated ADHD subtype; if the record is vague, query for clarification before finalizing F90.0.