2020 ICD-10-CM Diagnosis Code S21

Open wound of thorax

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • S21 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM S21 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of S21 - other international versions of ICD-10 S21 may differ.
Code Also
Code Also Help
A code also note instructs that 2 codes may be required to fully describe a condition but the sequencing of the two codes is discretionary, depending on the severity of the conditions and the reason for the encounter.
  • any associated injury, such as:
  • injury of heart (
    ICD-10-CM Diagnosis Code S26
    • S26 Injury of heart
      • S26.0 Injury of heart with hemopericardium
        • S26.00 Unspecified injury of heart with hemopericard...
          • S26.00XA Unspecified injury of heart with hemopericard...
          • S26.00XD Unspecified injury of heart with hemopericard...
          • S26.00XS Unspecified injury of heart with hemopericard...
        • S26.01 Contusion of heart with hemopericardium
          • S26.01XA Contusion of heart with hemopericardium, init...
          • S26.01XD Contusion of heart with hemopericardium, subs...
          • S26.01XS Contusion of heart with hemopericardium, sequ...
        • S26.02 Laceration of heart with hemopericardium
          • S26.020 Mild laceration of heart with hemopericardium...
            • S26.020A Mild laceration of heart with hemopericardium...
            • S26.020D Mild laceration of heart with hemopericardium...
            • S26.020S Mild laceration of heart with hemopericardium...
          • S26.021 Moderate laceration of heart with hemopericar...
            • S26.021A Moderate laceration of heart with hemopericar...
            • S26.021D Moderate laceration of heart with hemopericar...
            • S26.021S Moderate laceration of heart with hemopericar...
          • S26.022 Major laceration of heart with hemopericardiu...
            • S26.022A Major laceration of heart with hemopericardiu...
            • S26.022D Major laceration of heart with hemopericardiu...
            • S26.022S Major laceration of heart with hemopericardiu...
        • S26.09 Other injury of heart with hemopericardium
          • S26.09XA Other injury of heart with hemopericardium, i...
          • S26.09XD Other injury of heart with hemopericardium, s...
          • S26.09XS Other injury of heart with hemopericardium, s...
      • S26.1 Injury of heart without hemopericardium
        • S26.10 Unspecified injury of heart without hemoperic...
          • S26.10XA Unspecified injury of heart without hemoperic...
          • S26.10XD Unspecified injury of heart without hemoperic...
          • S26.10XS Unspecified injury of heart without hemoperic...
        • S26.11 Contusion of heart without hemopericardium
          • S26.11XA Contusion of heart without hemopericardium, i...
          • S26.11XD Contusion of heart without hemopericardium, s...
          • S26.11XS Contusion of heart without hemopericardium, s...
        • S26.12 Laceration of heart without hemopericardium
          • S26.12XA Laceration of heart without hemopericardium, ...
          • S26.12XD Laceration of heart without hemopericardium, ...
          • S26.12XS Laceration of heart without hemopericardium, ...
        • S26.19 Other injury of heart without hemopericardium...
          • S26.19XA Other injury of heart without hemopericardium...
          • S26.19XD Other injury of heart without hemopericardium...
          • S26.19XS Other injury of heart without hemopericardium...
      • S26.9 Injury of heart, unspecified with or without ...
        • S26.90 Unspecified injury of heart, unspecified with...
          • S26.90XA Unspecified injury of heart, unspecified with...
          • S26.90XD Unspecified injury of heart, unspecified with...
          • S26.90XS Unspecified injury of heart, unspecified with...
        • S26.91 Contusion of heart, unspecified with or witho...
          • S26.91XA Contusion of heart, unspecified with or witho...
          • S26.91XD Contusion of heart, unspecified with or witho...
          • S26.91XS Contusion of heart, unspecified with or witho...
        • S26.92 Laceration of heart, unspecified with or with...
          • S26.92XA Laceration of heart, unspecified with or with...
          • S26.92XD Laceration of heart, unspecified with or with...
          • S26.92XS Laceration of heart, unspecified with or with...
        • S26.99 Other injury of heart, unspecified with or wi...
          • S26.99XA Other injury of heart, unspecified with or wi...
          • S26.99XD Other injury of heart, unspecified with or wi...
          • S26.99XS Other injury of heart, unspecified with or wi...
    S26.-
    )
  • injury of intrathoracic organs (
    ICD-10-CM Diagnosis Code S27
    • S27 Injury of other and unspecified intrathoracic...
      • S27.0 Traumatic pneumothorax
      • S27.1 Traumatic hemothorax
      • S27.2 Traumatic hemopneumothorax
        • S27.2XXA Traumatic hemopneumothorax, initial encounter...
        • S27.2XXD Traumatic hemopneumothorax, subsequent encoun...
        • S27.2XXS …… sequela
      • S27.3 Other and unspecified injuries of lung
        • S27.30 Unspecified injury of lung
          • S27.301 Unspecified injury of lung, unilateral
            • S27.301A Unspecified injury of lung, unilateral, initi...
            • S27.301D Unspecified injury of lung, unilateral, subse...
            • S27.301S Unspecified injury of lung, unilateral, seque...
          • S27.302 Unspecified injury of lung, bilateral
            • S27.302A Unspecified injury of lung, bilateral, initia...
            • S27.302D Unspecified injury of lung, bilateral, subseq...
            • S27.302S Unspecified injury of lung, bilateral, sequel...
          • S27.309 Unspecified injury of lung, unspecified
            • S27.309A Unspecified injury of lung, unspecified, init...
            • S27.309D Unspecified injury of lung, unspecified, subs...
            • S27.309S Unspecified injury of lung, unspecified, sequ...
        • S27.31 Primary blast injury of lung
          • S27.311 Primary blast injury of lung, unilateral
            • S27.311A Primary blast injury of lung, unilateral, ini...
            • S27.311D Primary blast injury of lung, unilateral, sub...
            • S27.311S Primary blast injury of lung, unilateral, seq...
          • S27.312 Primary blast injury of lung, bilateral
            • S27.312A Primary blast injury of lung, bilateral, init...
            • S27.312D Primary blast injury of lung, bilateral, subs...
            • S27.312S Primary blast injury of lung, bilateral, sequ...
          • S27.319 Primary blast injury of lung, unspecified
            • S27.319A Primary blast injury of lung, unspecified, in...
            • S27.319D Primary blast injury of lung, unspecified, su...
            • S27.319S Primary blast injury of lung, unspecified, se...
        • S27.32 Contusion of lung
          • S27.321 Contusion of lung, unilateral
            • S27.321A Contusion of lung, unilateral, initial encoun...
            • S27.321D Contusion of lung, unilateral, subsequent enc...
            • S27.321S …… sequela
          • S27.322 Contusion of lung, bilateral
            • S27.322A Contusion of lung, bilateral, initial encount...
            • S27.322D Contusion of lung, bilateral, subsequent enco...
            • S27.322S …… sequela
          • S27.329 Contusion of lung, unspecified
            • S27.329A Contusion of lung, unspecified, initial encou...
            • S27.329D Contusion of lung, unspecified, subsequent en...
            • S27.329S …… sequela
        • S27.33 Laceration of lung
          • S27.331 Laceration of lung, unilateral
            • S27.331A Laceration of lung, unilateral, initial encou...
            • S27.331D Laceration of lung, unilateral, subsequent en...
            • S27.331S …… sequela
          • S27.332 Laceration of lung, bilateral
            • S27.332A Laceration of lung, bilateral, initial encoun...
            • S27.332D Laceration of lung, bilateral, subsequent enc...
            • S27.332S …… sequela
          • S27.339 Laceration of lung, unspecified
            • S27.339A Laceration of lung, unspecified, initial enco...
            • S27.339D Laceration of lung, unspecified, subsequent e...
            • S27.339S …… sequela
        • S27.39 Other injuries of lung
          • S27.391 Other injuries of lung, unilateral
            • S27.391A Other injuries of lung, unilateral, initial e...
            • S27.391D Other injuries of lung, unilateral, subsequen...
            • S27.391S …… sequela
          • S27.392 Other injuries of lung, bilateral
            • S27.392A Other injuries of lung, bilateral, initial en...
            • S27.392D Other injuries of lung, bilateral, subsequent...
            • S27.392S …… sequela
          • S27.399 Other injuries of lung, unspecified
            • S27.399A Other injuries of lung, unspecified, initial ...
            • S27.399D Other injuries of lung, unspecified, subseque...
            • S27.399S …… sequela
      • S27.4 Injury of bronchus
        • S27.40 Unspecified injury of bronchus
          • S27.401 Unspecified injury of bronchus, unilateral
            • S27.401A Unspecified injury of bronchus, unilateral, i...
            • S27.401D Unspecified injury of bronchus, unilateral, s...
            • S27.401S Unspecified injury of bronchus, unilateral, s...
          • S27.402 Unspecified injury of bronchus, bilateral
            • S27.402A Unspecified injury of bronchus, bilateral, in...
            • S27.402D Unspecified injury of bronchus, bilateral, su...
            • S27.402S Unspecified injury of bronchus, bilateral, se...
          • S27.409 Unspecified injury of bronchus, unspecified
            • S27.409A Unspecified injury of bronchus, unspecified, ...
            • S27.409D Unspecified injury of bronchus, unspecified, ...
            • S27.409S Unspecified injury of bronchus, unspecified, ...
        • S27.41 Primary blast injury of bronchus
          • S27.411 Primary blast injury of bronchus, unilateral
            • S27.411A Primary blast injury of bronchus, unilateral,...
            • S27.411D Primary blast injury of bronchus, unilateral,...
            • S27.411S Primary blast injury of bronchus, unilateral,...
          • S27.412 Primary blast injury of bronchus, bilateral
            • S27.412A Primary blast injury of bronchus, bilateral, ...
            • S27.412D Primary blast injury of bronchus, bilateral, ...
            • S27.412S Primary blast injury of bronchus, bilateral, ...
          • S27.419 Primary blast injury of bronchus, unspecified...
            • S27.419A Primary blast injury of bronchus, unspecified...
            • S27.419D Primary blast injury of bronchus, unspecified...
            • S27.419S Primary blast injury of bronchus, unspecified...
        • S27.42 Contusion of bronchus
          • S27.421 Contusion of bronchus, unilateral
            • S27.421A Contusion of bronchus, unilateral, initial en...
            • S27.421D Contusion of bronchus, unilateral, subsequent...
            • S27.421S …… sequela
          • S27.422 Contusion of bronchus, bilateral
            • S27.422A Contusion of bronchus, bilateral, initial enc...
            • S27.422D Contusion of bronchus, bilateral, subsequent ...
            • S27.422S …… sequela
          • S27.429 Contusion of bronchus, unspecified
            • S27.429A Contusion of bronchus, unspecified, initial e...
            • S27.429D Contusion of bronchus, unspecified, subsequen...
            • S27.429S …… sequela
        • S27.43 Laceration of bronchus
          • S27.431 Laceration of bronchus, unilateral
            • S27.431A Laceration of bronchus, unilateral, initial e...
            • S27.431D Laceration of bronchus, unilateral, subsequen...
            • S27.431S …… sequela
          • S27.432 Laceration of bronchus, bilateral
            • S27.432A Laceration of bronchus, bilateral, initial en...
            • S27.432D Laceration of bronchus, bilateral, subsequent...
            • S27.432S …… sequela
          • S27.439 Laceration of bronchus, unspecified
            • S27.439A Laceration of bronchus, unspecified, initial ...
            • S27.439D Laceration of bronchus, unspecified, subseque...
            • S27.439S …… sequela
        • S27.49 Other injury of bronchus
          • S27.491 Other injury of bronchus, unilateral
            • S27.491A Other injury of bronchus, unilateral, initial...
            • S27.491D Other injury of bronchus, unilateral, subsequ...
            • S27.491S Other injury of bronchus, unilateral, sequela...
          • S27.492 Other injury of bronchus, bilateral
            • S27.492A Other injury of bronchus, bilateral, initial ...
            • S27.492D Other injury of bronchus, bilateral, subseque...
            • S27.492S …… sequela
          • S27.499 Other injury of bronchus, unspecified
            • S27.499A Other injury of bronchus, unspecified, initia...
            • S27.499D Other injury of bronchus, unspecified, subseq...
            • S27.499S Other injury of bronchus, unspecified, sequel...
      • S27.5 Injury of thoracic trachea
        • S27.50 Unspecified injury of thoracic trachea
          • S27.50XA Unspecified injury of thoracic trachea, initi...
          • S27.50XD Unspecified injury of thoracic trachea, subse...
          • S27.50XS Unspecified injury of thoracic trachea, seque...
        • S27.51 Primary blast injury of thoracic trachea
          • S27.51XA Primary blast injury of thoracic trachea, ini...
          • S27.51XD Primary blast injury of thoracic trachea, sub...
          • S27.51XS Primary blast injury of thoracic trachea, seq...
        • S27.52 Contusion of thoracic trachea
          • S27.52XA Contusion of thoracic trachea, initial encoun...
          • S27.52XD Contusion of thoracic trachea, subsequent enc...
          • S27.52XS …… sequela
        • S27.53 Laceration of thoracic trachea
          • S27.53XA Laceration of thoracic trachea, initial encou...
          • S27.53XD Laceration of thoracic trachea, subsequent en...
          • S27.53XS …… sequela
        • S27.59 Other injury of thoracic trachea
          • S27.59XA Other injury of thoracic trachea, initial enc...
          • S27.59XD Other injury of thoracic trachea, subsequent ...
          • S27.59XS …… sequela
      • S27.6 Injury of pleura
      • S27.8 Injury of other specified intrathoracic organ...
        • S27.80 Injury of diaphragm
        • S27.81 Injury of esophagus (thoracic part)
          • S27.812 Contusion of esophagus (thoracic part)
            • S27.812A Contusion of esophagus (thoracic part), initi...
            • S27.812D Contusion of esophagus (thoracic part), subse...
            • S27.812S Contusion of esophagus (thoracic part), seque...
          • S27.813 Laceration of esophagus (thoracic part)
            • S27.813A Laceration of esophagus (thoracic part), init...
            • S27.813D Laceration of esophagus (thoracic part), subs...
            • S27.813S Laceration of esophagus (thoracic part), sequ...
          • S27.818 Other injury of esophagus (thoracic part)
            • S27.818A Other injury of esophagus (thoracic part), in...
            • S27.818D Other injury of esophagus (thoracic part), su...
            • S27.818S Other injury of esophagus (thoracic part), se...
          • S27.819 Unspecified injury of esophagus (thoracic par...
            • S27.819A Unspecified injury of esophagus (thoracic par...
            • S27.819D Unspecified injury of esophagus (thoracic par...
            • S27.819S Unspecified injury of esophagus (thoracic par...
        • S27.89 Injury of other specified intrathoracic organ...
          • S27.892 Contusion of other specified intrathoracic or...
            • S27.892A Contusion of other specified intrathoracic or...
            • S27.892D Contusion of other specified intrathoracic or...
            • S27.892S Contusion of other specified intrathoracic or...
          • S27.893 Laceration of other specified intrathoracic o...
            • S27.893A Laceration of other specified intrathoracic o...
            • S27.893D Laceration of other specified intrathoracic o...
            • S27.893S Laceration of other specified intrathoracic o...
          • S27.898 Other injury of other specified intrathoracic...
            • S27.898A Other injury of other specified intrathoracic...
            • S27.898D Other injury of other specified intrathoracic...
            • S27.898S Other injury of other specified intrathoracic...
          • S27.899 Unspecified injury of other specified intrath...
            • S27.899A Unspecified injury of other specified intrath...
            • S27.899D Unspecified injury of other specified intrath...
            • S27.899S Unspecified injury of other specified intrath...
      • S27.9 Injury of unspecified intrathoracic organ
        • S27.9XXA Injury of unspecified intrathoracic organ, in...
        • S27.9XXD Injury of unspecified intrathoracic organ, su...
        • S27.9XXS Injury of unspecified intrathoracic organ, se...
    S27.-
    )
  • rib fracture (
    ICD-10-CM Diagnosis Code S22.3

    Fracture of one rib

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    S22.3-
    ,
    ICD-10-CM Diagnosis Code S22.4

    Multiple fractures of ribs

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Fractures of two or more ribs
    Type 1 Excludes
    S22.4-
    )
  • spinal cord injury (
    ICD-10-CM Diagnosis Code S24.0

    Concussion and edema of thoracic spinal cord

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    S24.0-
    ,
    ICD-10-CM Diagnosis Code S24.1

    Other and unspecified injuries of thoracic spinal cord

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    S24.1-
    )
  • traumatic hemopneumothorax (
    ICD-10-CM Diagnosis Code S27.3

    Other and unspecified injuries of lung

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    S27.3
    )
  • traumatic hemothorax (
    ICD-10-CM Diagnosis Code S27.1

    Traumatic hemothorax

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    S27.1
    )
  • traumatic pneumothorax (
    ICD-10-CM Diagnosis Code S27.0

    Traumatic pneumothorax

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • spontaneous pneumothorax (J93.-)
    S27.0
    )
  • wound infection
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as S21. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • traumatic amputation (partial) of thorax (
    ICD-10-CM Diagnosis Code S28.1

    Traumatic amputation (partial) of part of thorax, except breast

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    S28.1
    )
The following code(s) above S21 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to S21:
  • S00-T88
    2020 ICD-10-CM Range S00-T88

    Injury, poisoning and certain other consequences of external causes

    Note
    • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
    Type 1 Excludes
    Use Additional
    • code to identify any retained foreign body, if applicable (Z18.-)
    Injury, poisoning and certain other consequences of external causes
  • S20-S29
    2020 ICD-10-CM Range S20-S29

    Injuries to the thorax

    Includes
    • injuries of breast
    • injuries of chest (wall)
    • injuries of interscapular area
    Type 2 Excludes
    • burns and corrosions (T20-T32)
    • effects of foreign body in bronchus (T17.5)
    • effects of foreign body in esophagus (T18.1)
    • effects of foreign body in lung (T17.8)
    • effects of foreign body in trachea (T17.4)
    • frostbite (T33-T34)
    • injuries of axilla
    • injuries of clavicle
    • injuries of scapular region
    • injuries of shoulder
    • insect bite or sting, venomous (T63.4)
    Injuries to the thorax
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to S21:
  • Code Also: S26
    , S27
    , S29
    , S23.1
    , S24
    , S25
    ICD-10-CM Diagnosis Code S26

    Injury of heart

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated:
    • open wound of thorax (S21.-)
    • traumatic hemopneumothorax (S27.2)
    • traumatic hemothorax (S27.1)
    • traumatic pneumothorax (S27.0)
    ICD-10-CM Diagnosis Code S27

    Injury of other and unspecified intrathoracic organs

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated open wound of thorax (S21.-)
    Type 2 Excludes
    • injury of cervical esophagus (S10-S19)
    • injury of trachea (cervical) (S10-S19)
    ICD-10-CM Diagnosis Code S29

    Other and unspecified injuries of thorax

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated open wound (S21.-)
    ICD-10-CM Diagnosis Code S23.1

    Subluxation and dislocation of thoracic vertebra

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    Type 2 Excludes
    • fracture of thoracic vertebrae (S22.0-)
    ICD-10-CM Diagnosis Code S24

    Injury of nerves and spinal cord at thorax level

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated:
    • fracture of thoracic vertebra (S22.0-)
    • open wound of thorax (S21.-)
    • transient paralysis (R29.5)
    Note
    • Code to highest level of thoracic spinal cord injury
    • Injuries to the spinal cord (S24.0 and S24.1) refer to the cord level and not bone level injury, and can affect nerve roots at and below the level given.
    Type 2 Excludes
    • injury of brachial plexus (S14.3)
    ICD-10-CM Diagnosis Code S25

    Injury of blood vessels of thorax

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code Also
    • any associated open wound (S21.-)
ICD-10-CM Codes Adjacent To S21
S20.95XD …… subsequent encounter
S20.95XS …… sequela
S20.96 Insect bite (nonvenomous) of unspecified parts of thorax
S20.96XA …… initial encounter
S20.96XD …… subsequent encounter
S20.96XS …… sequela
S20.97 Other superficial bite of unspecified parts of thorax
S20.97XA …… initial encounter
S20.97XD …… subsequent encounter
S20.97XS …… sequela
S21 Open wound of thorax
S21.0 Open wound of breast
S21.00 Unspecified open wound of breast
S21.001 Unspecified open wound of right breast
S21.001A …… initial encounter
S21.001D …… subsequent encounter
S21.001S …… sequela
S21.002 Unspecified open wound of left breast
S21.002A …… initial encounter
S21.002D …… subsequent encounter
S21.002S …… sequela

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.