2021 ICD-10-CM Code S21.40

Unspecified open wound of back wall of thorax with penetration into thoracic cavity

Version 2021
Non-Billable Code
Unspecified Code

Not Valid for Submission

S21.40 is a "header" nonspecific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of unspecified open wound of back 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.

Unspecified diagnosis codes like S21.40 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

ICD-10:S21.40
Short Description:Unsp opn wnd back wall of thorax w penet thoracic cavity
Long Description:Unspecified open wound of back wall of thorax with penetration into thoracic cavity

Code Classification

Specific Coding for Unsp opn wnd back wall of thorax w penet thoracic cavity

Header codes like S21.40 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 unsp opn wnd back wall of thorax w penet thoracic cavity:

  • S21.401 - Unspecified open wound of right back wall of thorax with penetration into thoracic cavity
  • S21.401A - Unspecified open wound of right back wall of thorax with penetration into thoracic cavity, initial encounter
  • S21.401D - Unspecified open wound of right back wall of thorax with penetration into thoracic cavity, subsequent encounter
  • S21.401S - Unspecified open wound of right back wall of thorax with penetration into thoracic cavity, sequela
  • S21.402 - Unspecified open wound of left back wall of thorax with penetration into thoracic cavity
  • S21.402A - Unspecified open wound of left back wall of thorax with penetration into thoracic cavity, initial encounter
  • S21.402D - Unspecified open wound of left back wall of thorax with penetration into thoracic cavity, subsequent encounter
  • S21.402S - Unspecified open wound of left back wall of thorax with penetration into thoracic cavity, sequela
  • S21.409 - Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity
  • S21.409A - Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity, initial encounter
  • S21.409D - Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity, subsequent encounter
  • S21.409S - Unspecified open wound of unspecified back wall of thorax with penetration into thoracic cavity, sequela

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 S21.40 are found in the index:

Information for Patients


Back Injuries

Your back is made of bones, muscles, and other tissues extending from your neck to your pelvis. Back injuries can result from sports injuries, work around the house or in the garden, or a sudden jolt such as a car accident. The lower back is the most common site of back injuries and back pain. Common back injuries include

These injuries can cause pain and limit your movement. Treatments vary but might include medicines, icing, bed rest, physical therapy, or surgery. You might be able to prevent some back injuries by maintaining a healthy weight, lifting objects with your legs, and using lower-back support when you sit.


[Learn More in MedlinePlus]

Wounds and Injuries

Also called: Traumatic injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening. Injuries can happen at work or play, indoors or outdoors, driving a car, or walking across the street.

Wounds are injuries that break the skin or other body tissues. They include cuts, scrapes, scratches, and punctured skin. They often happen because of an accident, but surgery, sutures, and stitches also cause wounds. Minor wounds usually aren't serious, but it is important to clean them. Serious and infected wounds may require first aid followed by a visit to your doctor. You should also seek attention if the wound is deep, you cannot close it yourself, you cannot stop the bleeding or get the dirt out, or it does not heal.

Other common types of injuries include


[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)