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S21.422Non-billableSave

S21.422 - Laceration with foreign body of left back wall of thorax with penetration into thoracic cavity

ICD-10-CM Chapter 19: Injury, poisoning and certain other consequences of external causes · S20-S29 Injuries to the thorax (S20-S29) · Subcategory of S21.42 · FY2027

Coding Guidance

S21.422 requires a 7th character. Report the code below that matches the documentation, for example A for initial encounter, D for subsequent encounter, S for sequela.

7th Character

The appropriate 7th character is to be added to each code from category S21

Includes, Excludes and Coding Notes

Excludes 1 — Not Coded HereFrom S21

Mutually exclusive: these conditions are never reported together with this code.

  • traumatic amputation (partial) of thorax (S28.1)
Code AlsoFrom S21

Report an additional code when both conditions apply.

  • any associated injury, such as:
  • injury of heart (S26.-)
  • injury of intrathoracic organs (S27.-)
  • rib fracture (S22.3-, S22.4-)
  • spinal cord injury (S24.0-, S24.1-)
  • traumatic hemopneumothorax (S27.3)
  • traumatic hemothorax (S27.1)
  • traumatic pneumothorax (S27.0)
  • wound infection
IncludesFrom S20-S29 Injuries to the thorax (S20-S29)

Conditions this code covers.

  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area
Excludes 2 — Not Included HereFrom S20-S29 Injuries to the thorax (S20-S29)

Not part of this code; report both codes when the patient has both conditions.

  • 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)
Excludes 2 — Not Included HereFrom Chapter S00-T88

Not part of this code; report both codes when the patient has both conditions.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)
Use Additional CodeFrom Chapter S00-T88

Add a secondary code to identify the associated condition or cause when it is documented.

  • code to identify any retained foreign body, if applicable (Z18.-)
NotesFrom Chapter S00-T88

Instructional notes from the ICD-10-CM tabular list.

  • 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
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

More Specific Codes (3)

S21.422ALaceration with foreign body of left back wall of thorax with penetration into thoracic cavity, initial encounter→S21.422DLaceration with foreign body of left back wall of thorax with penetration into thoracic cavity, subsequent encounter→S21.422SLaceration with foreign body of left back wall of thorax with penetration into thoracic cavity, sequela→