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ICD-10 Guide
DiagnosesAggression

Aggression

ICD-10 Coding for Aggression(R45.6, F91.1)

PRIMARY SPECIALTYPediatrics
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Aggression?
Essential facts and insights about Aggression

Key Clinical Considerations:

  • Presence of aggressive behavior such as physical violence, verbal hostility, or destruction of property.
  • Assessment of underlying psychological conditions such as conduct disorder or intermittent explosive disorder.
  • Physical examination may reveal signs of injury or trauma related to aggressive incidents.
  • No specific imaging or procedural findings are typically required for diagnosis.
  • Severity of aggression can be assessed based on frequency, intensity, and impact on social functioning.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's history of aggressive behavior, including frequency and context.
  • Use specific terminology such as 'aggressive outbursts' or 'hostile behavior' in the medical record.
  • Examples include: 'Patient exhibits aggressive behavior towards peers' or 'History of physical altercations.'
  • Document medical necessity for interventions aimed at managing aggression, such as therapy or medication.
  • Quality measures may include tracking the frequency of aggressive incidents and response to treatment.

Coding Guidelines

Usage Guidelines & Examples

  • Use R45.6 for general aggression without a specific underlying disorder; use F91.1 for conduct disorder with aggressive behavior.
  • Do not use R45.6 for aggression due to a medical condition or substance use; these should be coded separately.
  • F91.1 is specifically for conduct disorder, while R45.6 is broader and can apply to various situations.
  • Common errors include misclassifying aggression as a symptom of another disorder; ensure proper documentation supports the diagnosis.
  • In complex cases, consider the patient's full clinical picture and any co-occurring disorders when selecting codes.

Code Exclusions

Important Exclusions

  • Exclude aggression due to substance intoxication or withdrawal; use appropriate substance-related codes.
  • Alternative codes for excluded conditions include F10-F19 for substance use disorders.
  • Conditions are excluded to ensure accurate representation of the underlying cause of aggression.
  • Common mistakes include failing to document the context of aggression, leading to inappropriate coding.
  • Related but distinct conditions include oppositional defiant disorder and other impulse control disorders.

Related ICD-10 Codes

Primary Codes
R45.6
Aggression, unspecified
F91.1
Conduct disorder, childhood-onset type
Ancillary Codes
R45.4
R45.6
Differential Codes
F91.1
F60.3
F90.9

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Pediatrics

Specialty Applications

  • Applies to children and adolescents exhibiting aggressive behaviors.
  • Patient populations include those with a history of trauma, family dysfunction, or mental health issues.
  • Clinical settings include outpatient mental health clinics, pediatric emergency departments, and inpatient psychiatric units.
  • Specialty-specific applications may involve pediatric psychiatry, psychology, and social work.
  • Treatment contexts include behavioral therapy, family counseling, and medication management.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Patient diagnosed with aggression based on clinical findings of [specific behaviors].'

Template 2

Template: 'Clinical presentation consistent with aggression including [specific symptoms].'

Template 3

Template: 'Diagnostic criteria for aggression met as evidenced by [specific findings].'

Template 4

Template: 'Treatment plan initiated for aggression with [specific interventions].'

Template 5

Template: 'Follow-up care for aggression including monitoring of [specific parameters].'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this diagnosis?

Detailed documentation of aggressive incidents, triggers, and interventions is required.

How does this differ from similar diagnoses?

Aggression is a symptom, while conduct disorder is a specific diagnosis with criteria.

What are common billing considerations?

Ensure that the diagnosis supports the medical necessity for treatment and interventions.

What procedures are typically associated?

Related CPT codes may include behavioral assessments and therapy sessions.

Are there any quality reporting implications?

Quality measures may include tracking aggression incidents and treatment outcomes.