Attention-deficit/hyperactivity disorder (ADHD) does not always present with visible hyperactivity or impulsive behavior. Many individuals—children, adolescents, and adults—experience ADHD primarily through persistent inattention, internal distractibility, and organizational difficulties. Because these symptoms are often quieter and less disruptive, this presentation is frequently overlooked or misattributed to motivation, anxiety, or mood concerns.
The ICD-10-CM code F90.0 is used for Attention-Deficit/Hyperactivity Disorder, Predominantly Inattentive Type. This diagnosis describes a neurodevelopmental disorder characterized by significant and persistent inattention, without prominent hyperactive or impulsive symptoms. It is a billable ICD-10-CM code, commonly used in clinical practice to document this specific ADHD presentation across the lifespan.
F90.0 (ICD-10 Code for ADHD, Predominantly Inattentive Type) is classified under Mental, Behavioral, and Neurodevelopmental Disorders, within the Attention-deficit hyperactivity disorders (F90) category, and remains valid for 2026 ICD-10-CM reporting and insurance reimbursement.
Key Details of ICD-10 Code F90.0
Definition: A subtype of ADHD in which inattention is the primary symptom domain, historically referred to as ADD, though this term is no longer used diagnostically.
Core Symptoms: Common features include careless mistakes, difficulty sustaining attention, appearing not to listen, failure to follow through on instructions, poor organization, avoidance of tasks requiring sustained mental effort, frequently losing items, easy distractibility, and forgetfulness in daily activities.
Diagnostic Criteria:
Inattention symptoms must:
- Persist for at least six months
- Be developmentally inappropriate
- Cause clinically significant impairment
- Be present in two or more settings (e.g., school, work, home)
Documentation Considerations: This subtype is often underdiagnosed, particularly in high-functioning individuals, because symptoms are less disruptive than hyperactive presentations. Clear documentation of functional impairment is essential.
Exclusions: F90.0 should not be used if symptoms are better explained by mood disorders, anxiety disorders, trauma-related conditions, or environmental stressors.
When to Use F90.0 (ICD-10 Code for ADHD, Predominantly Inattentive Type)
Clinicians should assign F90.0 when a patient meets full ADHD diagnostic criteria and inattention is the primary impairment, with minimal hyperactivity or impulsivity. This diagnosis applies when attention difficulties significantly interfere with academic performance, occupational functioning, or daily life management, even if outward behavior appears calm or compliant.
This code is appropriate for children, adolescents, and adults, provided there is evidence that symptoms were present during childhood and continue to cause impairment over time.
F90.0 Compared to Other ADHD Subtypes
The distinction between ADHD subtypes is clinically important. F90.0 (Predominantly Inattentive Type) is characterized by internal cognitive and organizational difficulties rather than physical restlessness. In contrast, F90.1 (Predominantly Hyperactive-Impulsive Type) involves overt motor activity, impulsive decision-making, and behavioral dysregulation. F90.2 (Combined Type) includes both inattentive and hyperactive-impulsive symptom clusters.
Accurate subtype identification supports more targeted treatment planning and reduces the risk of under- or overtreatment.
Differentiating Inattentive ADHD From Anxiety or Depression
Inattention is not unique to ADHD and may also appear in mood or anxiety disorders. The key distinction lies in chronicity and context. ADHD-related inattention is persistent, developmentally rooted, and present across situations. In contrast, attention difficulties related to anxiety or depression typically fluctuate with emotional state and improve when the underlying condition is treated.
If concentration improves significantly with mood or anxiety treatment, ADHD should be reconsidered.
Commonly Associated ICD-10 Codes
Related ADHD classifications include:
- F90.1 – ADHD, predominantly hyperactive-impulsive type
- F90.2 – ADHD, combined type
- F90.9 – ADHD, unspecified type
Selecting the most specific code improves diagnostic clarity and payer compliance.
Interventions and CPT Codes for ADHD, Inattentive Type
Treatment for inattentive ADHD is typically multimodal. Psychotherapy often focuses on executive functioning skills such as organization, time management, and task initiation. Cognitive-behavioral strategies are commonly used to address procrastination, distractibility, and emotional regulation.
Medication may be indicated when symptoms significantly impair functioning. Both stimulant and non-stimulant options are used, depending on individual response and comorbidities. Common CPT codes include 90832, 90834, and 90837 for psychotherapy, 90791 or 90792 for diagnostic evaluation, and 99213–99215 for medication management.
Clinical Documentation Considerations for F90.0
Because inattentive ADHD is frequently questioned by payers, documentation should clearly demonstrate symptom persistence, cross-setting impairment, and developmental onset. Notes should explain why symptoms are not better accounted for by anxiety, depression, or situational factors.
Consistent documentation supports medical necessity, continuity of care, and long-term treatment planning. Mentalyc helps clinicians capture symptom patterns, functional impact, and diagnostic rationale over time—making it easier to maintain accurate, compliant ADHD documentation while reducing administrative burden.