J93.12 Secondary spontaneous pneumothorax

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Code first

• underlying condition, such as:
• catamenial pneumothorax due to endometriosis (N80.B-)
• cystic fibrosis (E84.-)
• eosinophilic pneumonia (J82.81-J82.82)
• lymphangioleiomyomatosis (J84.81)
• malignant neoplasm of bronchus and lung (C34.-)
• Marfan syndrome (Q87.4-)
• pneumonia due to Pneumocystis carinii (B59)
• secondary malignant neoplasm of lung (C78.0-)
• spontaneous rupture of the esophagus (K22.3)

Applies from J93 Pneumothorax and air leak

Excludes1 (never code together)

• congenital or perinatal pneumothorax (P25.1)
• postprocedural air leak (J95.812)
• postprocedural pneumothorax (J95.811)
• traumatic pneumothorax (S27.0)
• tuberculous (current disease) pneumothorax (A15.-)
• pyopneumothorax (J86.-)

MS-DRG index

Defines the logic of DRG(s) 199-201 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 512.82 Secondary spontaneous pneumothorax

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

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to J93.12

Back-references to J93.12

• Code Also: N80.B Endometriosis of cardiothoracic space ("catamenial pneumothorax (J93.12)")

Back-references to J93

• Type 1 Excludes: S27.0 Traumatic pneumothorax ("spontaneous pneumothorax (J93.-)")

Diagnosis Index entries for J93.12

• Pneumothorax NOS › spontaneous NOS › secondary

Nearby codes

• J93 Pneumothorax and air leak
• J93.0 Spontaneous tension pneumothorax
• J93.1 Other spontaneous pneumothorax
• J93.11 Primary spontaneous pneumothorax
• J93.12 Secondary spontaneous pneumothorax (this code)
• J93.8 Other pneumothorax and air leak
• J93.81 Chronic pneumothorax
• J93.82 Other air leak
• J93.83 Other pneumothorax
• J93.9 Pneumothorax, unspecified