2021 ICD-10-CM Code S21.35

Open bite of front wall of thorax with penetration into thoracic cavity

Version 2021
Non-Billable Code

Not Valid for Submission

S21.35 is a "header" nonspecific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of open bite of front wall of thorax with penetration into thoracic cavity. The code 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:S21.35
Short Description:Open bite of front wall of thorax w penet thoracic cavity
Long Description:Open bite of front wall of thorax with penetration into thoracic cavity

Code Classification

Specific Coding for Open bite of front wall of thorax w penet thoracic cavity

Header codes like S21.35 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 front wall of thorax w penet thoracic cavity:

  • S21.351 - Open bite of right front wall of thorax with penetration into thoracic cavity
  • S21.351A - Open bite of right front wall of thorax with penetration into thoracic cavity, initial encounter
  • S21.351D - Open bite of right front wall of thorax with penetration into thoracic cavity, subsequent encounter
  • S21.351S - Open bite of right front wall of thorax with penetration into thoracic cavity, sequela
  • S21.352 - Open bite of left front wall of thorax with penetration into thoracic cavity
  • S21.352A - Open bite of left front wall of thorax with penetration into thoracic cavity, initial encounter
  • S21.352D - Open bite of left front wall of thorax with penetration into thoracic cavity, subsequent encounter
  • S21.352S - Open bite of left front wall of thorax with penetration into thoracic cavity, sequela
  • S21.359 - Open bite of unspecified front wall of thorax with penetration into thoracic cavity
  • S21.359A - Open bite of unspecified front wall of thorax with penetration into thoracic cavity, initial encounter
  • S21.359D - Open bite of unspecified front wall of thorax with penetration into thoracic cavity, subsequent encounter
  • S21.359S - Open bite of unspecified front wall of thorax with penetration into thoracic cavity, sequela

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code S21.35:


Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

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 S21.35 are found in the index:

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)