ADHD ICD-10 Codes for Therapists: Complete Billing Guide

Attention-Deficit/Hyperactivity Disorder is among the most commonly diagnosed conditions in mental health practice, with three ADHD codes now appearing in the top 20 most-billed diagnoses nationally. Whether you're working with children, adolescents, or the growing population of adults seeking ADHD evaluation and treatment, accurate ICD-10 coding directly impacts your reimbursement.

This guide covers all ADHD-related ICD-10 codes, including the primary F90 codes, combination presentations, and the often-overlooked codes for ADHD in remission. You'll also find documentation tips and guidance on differentiating ADHD subtypes for billing purposes.

Quick Reference: ADHD ICD-10 Codes

Understanding ADHD Diagnosis Codes

All ADHD codes fall under the F90 category in ICD-10-CM. The coding structure aligns with DSM-5 presentation specifiers, making the crosswalk relatively straightforward compared to some other diagnoses.

The key coding decision is presentation type—which symptom cluster predominates:

• Inattentive (F90.0): Difficulty sustaining attention, easily distracted, forgetful, loses things, doesn't follow through
• Hyperactive-impulsive (F90.1): Fidgeting, can't stay seated, runs/climbs excessively, talks excessively, interrupts, can't wait turn
• Combined (F90.2): Meets criteria for both inattentive and hyperactive-impulsive

F90.2 (combined) remains the most commonly billed, but F90.0 (inattentive) has been climbing—driven largely by adult diagnoses and increased recognition in women and girls, where hyperactivity may be less overt.

Primary ADHD ICD-10 Codes

F90.0 — ADHD, Predominantly Inattentive Presentation

When to use: The client meets full criteria for inattention (6+ symptoms for children, 5+ for adults 17+) but does not meet full criteria for hyperactivity-impulsivity.

Clinical picture:

• Difficulty sustaining attention in tasks or play
• Doesn't seem to listen when spoken to directly
• Fails to follow through on instructions or finish tasks
• Difficulty organizing tasks and activities
• Avoids tasks requiring sustained mental effort
• Loses things necessary for tasks
• Easily distracted by extraneous stimuli
• Forgetful in daily activities

Documentation requirements:

• Symptom presence before age 12 (per DSM-5)
• Symptoms present in two or more settings (home, work, school)
• Clear evidence of functional impairment
• Symptoms not better explained by another mental disorder

F90.1 — ADHD, Predominantly Hyperactive-Impulsive Presentation

When to use: The client meets full criteria for hyperactivity-impulsivity (6+ symptoms for children, 5+ for adults) but does not meet full criteria for inattention.

Clinical picture:

• Fidgets or squirms when seated
• Leaves seat when remaining seated is expected
• Runs or climbs in inappropriate situations
• Unable to engage in leisure activities quietly
• "On the go" or acts as if "driven by a motor"
• Talks excessively
• Blurts out answers before questions are completed
• Difficulty waiting turn
• Interrupts or intrudes on others

Note: This presentation is less common in adults, as hyperactive symptoms often diminish with age while inattentive symptoms persist.

F90.2 — ADHD, Combined Presentation

When to use: The client meets full criteria for both inattention AND hyperactivity-impulsivity.

Clinical picture: Combination of symptoms from both F90.0 and F90.1 presentations.

Documentation requirements:

• Document symptoms from both clusters
• Establish that full criteria are met for each (not just a few symptoms from each)
• Same age-of-onset and multi-setting requirements apply

Billing notes: This is the most commonly billed ADHD code, ranking #11 nationally. It's the "default" when both symptom clusters are present at clinical levels.

F90.8 — Attention-Deficit Hyperactivity Disorder, Other Type

When to use: The client has ADHD symptoms that cause clinically significant impairment but don't fit neatly into the three standard presentations.

Examples:

• Subthreshold presentations with significant impairment
• Late-onset cases (symptoms clearly emerging after age 12)
• Atypical symptom patterns

Billing notes: Use sparingly. Most cases should fit F90.0, F90.1, or F90.2. If you're using F90.8 frequently, review whether your assessments are capturing the full symptom picture.

F90.9 — Attention-Deficit Hyperactivity Disorder, Unspecified Type

When to use: ADHD is clearly present, but you don't yet have sufficient information to determine the specific presentation.

Appropriate scenarios:

• Initial evaluation still in progress
• Records unavailable to confirm symptom history
• Collateral information pending

Related Codes

ADHD rarely exists in isolation. Common comorbidities you may need to code alongside ADHD:

When coding comorbidities, list the primary focus of treatment first.

ADHD in Partial Remission

When a client has previously met full ADHD criteria but now shows improvement while still requiring treatment:

Related Behavioral Codes

These codes may be relevant when ADHD presents with comorbid behavioral concerns:

Adult ADHD Considerations

Adult ADHD uses the same F90 codes as childhood ADHD. There is no separate "adult ADHD" code. When diagnosing adults:

• Document symptom presence before age 12 (per DSM-5 criteria)
• Note functional impairment in multiple settings (work, home, relationships)
• Consider F90.0 (inattentive) which is often underdiagnosed in adults, particularly women
• Rule out other conditions that mimic ADHD (anxiety, depression, sleep disorders)

Billing Considerations

Age-Related Documentation

DSM-5 requires symptom onset before age 12, but many adults seeking diagnosis didn't receive childhood evaluation. Your documentation should:

• Attempt to establish childhood symptom presence through client history
• Note any corroborating information (report cards, family accounts)
• If childhood history is unclear, document your clinical reasoning

Medication Management vs. Therapy

ADHD treatment often involves both medication and behavioral interventions. If you're providing therapy while a prescriber manages medication:

• Your diagnosis code should reflect your clinical assessment
• Coordinate with the prescriber to ensure coding consistency
• Document how your therapeutic interventions address ADHD symptoms

Presentation Changes Over Time

Presentation type can shift across the lifespan. A child diagnosed with combined type may present as predominantly inattentive in adulthood (as hyperactive symptoms diminish). Update your coding to reflect current presentation.

Documentation Tips

Strong ADHD documentation should include:

Symptom inventory: Specific symptoms observed or reported, with examples

Onset information: Evidence or client report of symptoms before age 12

Setting verification: How symptoms manifest across multiple settings (work, home, relationships)

Functional impairment: Concrete ways ADHD affects daily functioning—job performance, relationships, financial management, task completion

Differential consideration: Brief note on why symptoms aren't better explained by anxiety, depression, sleep disorders, or other conditions

Severity: Mild, moderate, or severe based on symptom count and functional impact

Accurate ADHD coding supports appropriate treatment and fair reimbursement. When in doubt, document thoroughly, specify the presentation type your assessment supports, and update codes as the clinical picture evolves.