F90.2 Attention-deficit hyperactivity disorder, combined type

Name of the Condition

• Common Name: Attention-Deficit Hyperactivity Disorder, Combined Type
• Technical/Medical Term: Attention-Deficit Hyperactivity Disorder, Combined Type

Summary

Attention-deficit hyperactivity disorder, combined type (ADHD-C) is a neurodevelopmental condition characterized by persistent patterns of inattention, hyperactivity, and impulsivity that interfere with functioning or development. Symptoms of both inattention and hyperactivity-impulsivity are equally prominent. The condition is diagnosed when symptoms are inconsistent with the individual's developmental level and occur across multiple settings, such as home, school, or work.

Causes

The exact cause of ADHD-C is not fully understood, but it is believed to involve a combination of genetic, neurological, and environmental factors. Research suggests that differences in brain structure and function, particularly in areas related to attention, impulse control, and executive function, may contribute to the condition. Genetic factors play a significant role, as ADHD often runs in families.

Risk Factors

• Family history of ADHD or other mental health disorders
• Premature birth or low birth weight
• Exposure to environmental toxins (e.g., lead) during pregnancy or early childhood
• Maternal smoking, alcohol use, or drug use during pregnancy
• Brain injuries

Symptoms

• Inattention: Difficulty sustaining focus, frequent careless mistakes, poor listening skills, disorganization, and forgetfulness.
• Hyperactivity: Excessive fidgeting, restlessness, difficulty remaining seated, and an inability to engage in quiet activities.
• Impulsivity: Interrupting others, difficulty waiting for turns, and acting without considering consequences.

Diagnosis

Diagnosis involves a comprehensive evaluation by a healthcare professional, including a detailed history of symptoms, observation across multiple settings, and ruling out other conditions. Criteria from the Diagnostic and Statistical Manual of Mental Disorders (DSM) or International Classification of Diseases (ICD) are typically used to confirm the presence of both inattentive and hyperactive-impulsive symptoms.

Treatment Options

Treatment often includes a combination of behavioral therapy, educational support, and medication (e.g., stimulants or non-stimulants). Behavioral interventions focus on improving organizational skills, time management, and social interactions. Individualized plans are tailored to the patient's age and symptom severity.

Prognosis and Follow-Up

With appropriate management, many individuals with ADHD-C can lead productive lives. Symptoms may persist into adulthood, but treatment can help mitigate their impact. Regular follow-up is important to adjust interventions and monitor for comorbid conditions, such as anxiety or learning disorders.

Complications

Untreated ADHD-C may lead to academic or occupational difficulties, relationship problems, and an increased risk of substance use disorders. Comorbid conditions, such as oppositional defiant disorder or mood disorders, can also complicate management.

Lifestyle & Prevention

While ADHD-C cannot be prevented, lifestyle strategies like maintaining a structured routine, minimizing distractions, and engaging in regular physical activity may help manage symptoms. Early recognition and intervention can improve outcomes.

When to Seek Professional Help

Seek evaluation if symptoms significantly interfere with daily functioning, relationships, or academic/work performance. Persistent inattention, hyperactivity, or impulsivity that disrupts multiple areas of life warrants professional assessment.

Tips for Medical Coders

Document the presence of both inattentive and hyperactive-impulsive symptoms to support the diagnosis of combined type. Ensure clinical notes specify symptom duration, onset, and impact on functioning across settings. Avoid coding based solely on medication use; confirm diagnostic criteria are met.