2021 ICD-10-CM Code S21.251

Open bite of right back wall of thorax without penetration into thoracic cavity

Version 2021

Not Valid for Submission

S21.251 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of open bite of right back wall of thorax without penetration into thoracic cavity. The code is not specific and is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

ICD-10:S21.251
Short Description:Open bite of r bk wl of thorax w/o penet thoracic cavity
Long Description:Open bite of right back wall of thorax without penetration into thoracic cavity

Code Classification

Coding Guidelines

The appropriate 7th character is to be added to each code from block Open wound of thorax (S21). Use the following options for the aplicable episode of care:

Specific Coding for Open bite of r bk wl of thorax w/o penet thoracic cavity

Non-specific codes like S21.251 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for open bite of r bk wl of thorax w/o penet thoracic cavity:

  • BILLABLE CODE - Use S21.251A for initial encounter
  • BILLABLE CODE - Use S21.251D for subsequent encounter
  • BILLABLE CODE - Use S21.251S for sequela

Information for Patients


Animal Bites

Also called: Cat bites, Dog bites

Wild animals usually avoid people. They might attack, however, if they feel threatened, are sick, or are protecting their young or territory. Attacks by pets are more common. Animal bites rarely are life-threatening, but if they become infected, you can develop serious medical problems.

To prevent animal bites and complications from bites

If an animal bites you, clean the wound with soap and water as soon as possible. Get medical attention if necessary.

Centers for Disease Control and Prevention


[Learn More in MedlinePlus]

Code History

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