S27.321A Contusion of lung, unilateral, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S27.321 with 7th character A (initial encounter).

Applies from S27 Injury of other and unspecified intrathoracic organs

Excludes2 (not included here)

• injury of cervical esophagus (S10-S19)
• injury of trachea (cervical) (S10-S19)

Code also

• any associated open wound of thorax (S21.-)

7th character note

• The appropriate 7th character is to be added to each code from category S27

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Code annotations containing back-references to S27.321A

Back-references to S27.3

• Code Also: S21 Open wound of thorax ("traumatic hemopneumothorax (S27.3)")

Back-references to S27

• Code Also: S21 Open wound of thorax ("injury of intrathoracic organs (S27.-)")
• Code Also: S22 Fracture of rib(s), sternum and thoracic spine ("injury of intrathoracic organ (S27.-)")

Diagnosis Index entries for S27.321A

• Contusion (skin surface intact) › lung › unilateral
• Injury › intrathoracic › lung › contusion › unilateral

Nearby codes

• S27.319A Primary blast injury of lung, unspecified, initial encounter
• S27.319D Primary blast injury of lung, unspecified, subsequent encounter
• S27.319S Primary blast injury of lung, unspecified, sequela
• S27.32 Contusion of lung
• S27.321 Contusion of lung, unilateral
• S27.321A Contusion of lung, unilateral, initial encounter (this code)
• S27.321D Contusion of lung, unilateral, subsequent encounter
• S27.321S Contusion of lung, unilateral, sequela
• S27.322 Contusion of lung, bilateral
• S27.322A Contusion of lung, bilateral, initial encounter
• S27.322D Contusion of lung, bilateral, subsequent encounter