S27.399A Other injuries of lung, unspecified, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S27.399 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

Applies from S27.39 Other injuries of lung

Applicable to

• Secondary blast injury of lung

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to S27.399A

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 S27.399A

• Injury › intrathoracic › lung › specified type NEC

Nearby codes

• S27.392 Other injuries of lung, bilateral
• S27.392A Other injuries of lung, bilateral, initial encounter
• S27.392D Other injuries of lung, bilateral, subsequent encounter
• S27.392S Other injuries of lung, bilateral, sequela
• S27.399 Other injuries of lung, unspecified
• S27.399A Other injuries of lung, unspecified, initial encounter (this code)
• S27.399D Other injuries of lung, unspecified, subsequent encounter
• S27.399S Other injuries of lung, unspecified, sequela
• S27.4 Injury of bronchus
• S27.40 Unspecified injury of bronchus
• S27.401 Unspecified injury of bronchus, unilateral