S27.301A Unspecified injury of lung, unilateral, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S27.301 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 S27.301A

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 S27.301A

• Injury › intrathoracic › lung › unilateral

Nearby codes

• S27.2XXD Traumatic hemopneumothorax, subsequent encounter
• S27.2XXS Traumatic hemopneumothorax, sequela
• S27.3 Other and unspecified injuries of lung
• S27.30 Unspecified injury of lung
• S27.301 Unspecified injury of lung, unilateral
• S27.301A Unspecified injury of lung, unilateral, initial encounter (this code)
• S27.301D Unspecified injury of lung, unilateral, subsequent encounter
• S27.301S Unspecified injury of lung, unilateral, sequela
• S27.302 Unspecified injury of lung, bilateral
• S27.302A Unspecified injury of lung, bilateral, initial encounter
• S27.302D Unspecified injury of lung, bilateral, subsequent encounter