ICD-10-CM 2027 diagnosis code
S21.1Open wound of front wall of thorax without penetration into thoracic cavity
S21.1 is a header code, so it can't be reported by itself. Choose one of the 6 more specific codes beneath it and add the required 7th character.Short description: Open wound of front wall of thorax w/o penet thoracic cavity
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About S21.1
S21.1 is the ICD-10-CM diagnosis code for open wound of front wall of thorax without penetration into thoracic cavity. It belongs to category S21 (open wound of thorax), block S20-S29 (injuries to the thorax) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.
Within S21, choose S21.1 (front wall of thorax without penetration into thoracic cavity) only when documentation doesn't support a more specific option: breast (S21.0), back wall of thorax without penetration into thoracic cavity (S21.2), front wall of thorax with penetration into thoracic cavity (S21.3), back wall of thorax with penetration into thoracic cavity (S21.4) and unspecified part of thorax (S21.9).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
7th character
The appropriate 7th character is to be added to each code from category S21
- S21.10Unspecified open wound of front wall of thorax without penetration into thoracic cavity
- S21.101Unspecified open wound of right front wall of thorax without penetration into thoracic cavity
- S21.102Unspecified open wound of left front wall of thorax without penetration into thoracic cavity
- S21.109Unspecified open wound of unspecified front wall of thorax without penetration into thoracic cavity
- S21.11Laceration without foreign body of front wall of thorax without penetration into thoracic cavity
- S21.111Laceration without foreign body of right front wall of thorax without penetration into thoracic cavity
- S21.112Laceration without foreign body of left front wall of thorax without penetration into thoracic cavity
- S21.119Laceration without foreign body of unspecified front wall of thorax without penetration into thoracic cavity
- S21.12Laceration with foreign body of front wall of thorax without penetration into thoracic cavity
- S21.121Laceration with foreign body of right front wall of thorax without penetration into thoracic cavity
- S21.122Laceration with foreign body of left front wall of thorax without penetration into thoracic cavity
- S21.129Laceration with foreign body of unspecified front wall of thorax without penetration into thoracic cavity
- S21.13Puncture wound without foreign body of front wall of thorax without penetration into thoracic cavity
- S21.131Puncture wound without foreign body of right front wall of thorax without penetration into thoracic cavity
- S21.132Puncture wound without foreign body of left front wall of thorax without penetration into thoracic cavity
- S21.139Puncture wound without foreign body of unspecified front wall of thorax without penetration into thoracic cavity
- S21.14Puncture wound with foreign body of front wall of thorax without penetration into thoracic cavity
- S21.141Puncture wound with foreign body of right front wall of thorax without penetration into thoracic cavity
- S21.142Puncture wound with foreign body of left front wall of thorax without penetration into thoracic cavity
- S21.149Puncture wound with foreign body of unspecified front wall of thorax without penetration into thoracic cavity
- S21.15Open bite of front wall of thorax without penetration into thoracic cavity
- Ainitial encounter
- Dsubsequent encounter
- Ssequela
Coding notes
- Open wound of chest without penetration into thoracic cavity
Notes that apply from higher levels
Instructions written at a parent level also apply to S21.1.
› From S21 Open wound of thorax
- traumatic amputation (partial) of thorax (S28.1)
Broader instructions also apply from S20-S29 Injuries to the thorax and Chapter 19: Injury, poisoning and certain other consequences of external causes.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about S21.1
Is S21.1 billable?
- No. S21.1 is a header code. Report one of its more specific subcodes instead.