All ICD10 Codes

S21.4

Non-Billable
ChapterS00–T88
Ranksubcategory
Official Description

Open wound of back wall of thorax with penetration into thoracic cavity

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).
General instructions are available for the parent sections:
View CH19 NotesView S20-S29 NotesView S21 Notes

Clinical Hierarchy

CH19Injury, poisoning and certain other consequences of external causes (S00-T88)
S20-S29Injuries to the thorax (S20-S29)
S21Open wound of thorax
S21.4Open wound of back wall of thorax with penetration into thoracic cavity
S21.40Unspecified open wound of back wall of thorax with penetration into thoracic cavity
S21.41Laceration without foreign body of back wall of thorax with penetration into thoracic cavity
S21.42Laceration with foreign body of back wall of thorax with penetration into thoracic cavity
S21.43Puncture wound without foreign body of back wall of thorax with penetration into thoracic cavity
S21.44Puncture wound with foreign body of back wall of thorax with penetration into thoracic cavity
S21.45Open bite of back wall of thorax with penetration into thoracic cavity

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to S21.4:

categoryS21
Open wound of thorax
View context instructions
blockS20-S29
Injuries to the thorax (S20-S29)
View context instructions
chapterCH19
Injury, poisoning and certain other consequences of external causes (S00-T88)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to S21.4. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

7 raw paths
Bite (s) (animal) (human)1 unique routes
thorax, thoracic (wall)
back
with penetration into thoracic cavity→S21.4
Laceration3 unique routes
thorax, thoracic (wall)(3 variants)
back(2 variants)
with(2 variants)
foreign body
with penetration into thoracic cavity→S21.4
penetration into thoracic cavity→S21.4
with foreign body
back
with penetration into thoracic cavity→S21.4
Puncture2 unique routes
thorax, thoracic (wall)(2 variants)
back(2 variants)
with(2 variants)
foreign body
with penetration→S21.4
penetration→S21.4
Wound, open1 unique routes
thorax, thoracic (wall)
back
with penetration→S21.4

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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