F90.1 Attention-deficit hyperactivity disorder, predominantly hyperactive type

Name of the Condition

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

Summary

Attention-deficit hyperactivity disorder, predominantly hyperactive type (ADHD-H) is a neurodevelopmental condition marked by persistent hyperactivity and impulsivity that interfere with functioning or development. Symptoms of hyperactivity and impulsivity are more prominent than inattention. 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-H 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 impulse control and motor activity, 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

• Hyperactivity: Fidgeting, leaving seats inappropriately, running or climbing excessively
• Impulsivity: Interrupting others, difficulty waiting turns, blurting out answers
• Inattention: May be present but less prominent than hyperactivity/impulsivity

Diagnosis

Clinical assessment through personal and family medical history, behavioral observations, and standardized rating scales to evaluate symptoms across settings. Diagnosis requires symptoms to be present before age 12, persist for at least 6 months, and significantly impair functioning in multiple environments.

Treatment Options

• Behavioral therapy: Parent training, classroom interventions, and social skills training
• Medication: Stimulant or non-stimulant medications to manage symptoms
• Educational support: Accommodations and individualized education plans (IEPs) for academic settings

Prognosis and Follow-Up

With appropriate treatment, many individuals experience improved symptom management and functioning. Long-term follow-up is often necessary, as symptoms may persist into adulthood. Regular monitoring of treatment effectiveness and adjustment of interventions may be required.

Complications

• Academic difficulties
• Social relationship challenges
• Increased risk of substance use disorders
• Occupational problems in adulthood

Lifestyle & Prevention

• Structured routines and environments to support focus and reduce distractions
• Regular physical activity to channel excess energy
• Clear communication and consistent expectations at home and school
• Avoidance of known environmental toxins during pregnancy and early childhood

When to Seek Professional Help

Seek evaluation if symptoms of hyperactivity and impulsivity are persistent, interfere with daily functioning, or cause distress in multiple settings. Early intervention can improve outcomes and help develop coping strategies.

Tips for Medical Coders

Document the predominance of hyperactive and impulsive symptoms over inattention to support accurate coding. Include details on symptom duration, onset, and impact on functioning across settings. Ensure documentation aligns with clinical criteria for ADHD-H to justify the specific code assignment.