S27.321Header code — not billable
Contusion of lung, unilateral
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- S27
- Effective date
- October 1, 2026
Related codes in category S27
S27Injury of other and unspecified intrathoracic organsS27.0Traumatic pneumothoraxS27.0XXATraumatic pneumothorax, initial encounterYesS27.0XXDTraumatic pneumothorax, subsequent encounterYesS27.0XXSTraumatic pneumothorax, sequelaYesS27.1Traumatic hemothoraxS27.1XXATraumatic hemothorax, initial encounterYesS27.1XXDTraumatic hemothorax, subsequent encounterYesS27.1XXSTraumatic hemothorax, sequelaYesS27.2Traumatic hemopneumothoraxS27.2XXATraumatic hemopneumothorax, initial encounterYesS27.2XXDTraumatic hemopneumothorax, subsequent encounterYes
Frequently asked questions
What is ICD-10 code S27.321?
S27.321 is an ICD-10-CM diagnosis code for Contusion of lung, unilateral.
Is S27.321 a billable code?
No. S27.321 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is S27.321 in?
S27.321 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did S27.321 become effective?
S27.321 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to S27.321?
S27.321 belongs to category S27, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.