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v1.0.0
ICD-10 Guide
ICD-10 CodesR45.5

R45.5

Hostility

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 R45.5 is a billable code used to indicate a diagnosis of hostility.

Key Diagnostic Point:

Hostility is characterized by feelings of anger, aggression, and a tendency to react negatively towards others. It can manifest in various ways, including verbal outbursts, physical aggression, or passive-aggressive behavior. Clinically, hostility may be observed in patients with underlying psychiatric conditions such as depression, anxiety disorders, or personality disorders. It can also be a response to stress, trauma, or substance abuse. The assessment of hostility often involves evaluating the patient's mood, behavior, and interpersonal relationships. Clinicians may use standardized scales to quantify hostility levels, and it is essential to consider the context in which these behaviors occur. Hostility can significantly impact a patient's social functioning and relationships, making it crucial for healthcare providers to address it appropriately. Understanding the underlying causes, such as unresolved conflicts, feelings of inadequacy, or environmental stressors, is vital for effective management and treatment.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of underlying causes (psychological, environmental, etc.)
  • Overlap with other psychiatric diagnoses
  • Subjectivity in assessing hostility levels
  • Need for comprehensive documentation to support diagnosis

Audit Risk Factors

  • Inadequate documentation of the patient's history and symptoms
  • Failure to link hostility to a specific diagnosis
  • Misclassification of hostility as a primary diagnosis when it is secondary
  • Lack of standardized assessment tools in documentation

Specialty Focus

Medical Specialties

Internal Medicine

Documentation Requirements

Detailed patient history, including psychosocial factors and any comorbid conditions.

Common Clinical Scenarios

Patients presenting with chronic illness may exhibit hostility due to frustration with their health status.

Billing Considerations

Consider the impact of physical health on mental state; document any relevant lab findings or treatments.

Emergency Medicine

Documentation Requirements

Immediate assessment of the patient's behavior and any threats to safety.

Common Clinical Scenarios

Patients presenting with acute agitation or aggression, possibly due to substance use or acute psychiatric episodes.

Billing Considerations

Document any interventions taken to ensure safety and the patient's response to treatment.

Coding Guidelines

Inclusion Criteria

Use R45.5 When
  • Follow the official ICD
  • CM guidelines for coding symptoms and signs
  • Ensure that R45
  • 5 is used only when hostility is not classified elsewhere and is a significant factor in the patient's clinical picture

Exclusion Criteria

Do NOT use R45.5 When
No specific exclusions found.

Related CPT Codes

90791CPT Code

Psychiatric diagnostic evaluation

Clinical Scenario

Used when assessing a patient exhibiting hostility to determine underlying causes.

Documentation Requirements

Comprehensive evaluation notes, including history and mental status examination.

Specialty Considerations

Mental health providers should ensure thorough documentation to support the diagnosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of symptoms like hostility, enabling better tracking of mental health issues and their impact on overall health.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of symptoms like hostility, enabling better tracking of mental health issues and their impact on overall health.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of symptoms like hostility, enabling better tracking of mental health issues and their impact on overall health.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

When should I use R45.5?

Use R45.5 when a patient exhibits hostility that is not classified under another diagnosis and is significant enough to warrant attention in their clinical management.