ICD-10-CM Code R45.5


Version 2021 Billable Code No Valid Principal Dx

Valid for Submission

R45.5 is a billable code used to specify a medical diagnosis of hostility. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code R45.5 might also be used to specify conditions or terms like aggressive character, bullying, bullying, bullying, bullying of adult, bullying of child, etc

According to ICD-10-CM guidelines this code should not to be used as a principal diagnosis code when a related definitive diagnosis has been established.

Short Description:Hostility
Long Description:Hostility

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code R45.5 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Aggressive character
  • Bullying
  • Bullying
  • Bullying
  • Bullying of adult
  • Bullying of child
  • Character trait finding of level of hostility
  • Emotional bullying
  • Feeling hatred
  • Goading
  • Hostile behavior
  • Intimidation
  • Provocative behavior
  • Teasing
  • Threatening behavior
  • Verbal aggression
  • Verbally threatening behavior

Clinical Information

  • HOSTILITY-. tendency to feel anger toward and to seek to inflict harm upon a person or group.

Convert R45.5 to ICD-9

  • 300.9 - Nonpsychotic disord NOS (Approximate Flag)

Code Classification

  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99)
    • Symptoms and signs involving cognition, perception, emotional state and behavior (R40-R46)
      • Symptoms and signs involving emotional state (R45)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021