Q34.1 Congenital cyst of mediastinum

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Q34 Other congenital malformations of respiratory system

Excludes2 (not included here)

• congenital central alveolar hypoventilation syndrome (G47.35)

MS-DRG index

Defines the logic of DRG(s) 205-206 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 748.8 Other specified anomalies of respiratory system (approximate)

Code annotations containing back-references to Q34.1

Back-references to Q34

• Code Also: P28 Other respiratory conditions originating in the perinatal period (", if applicable, congenital malformations of the respiratory system (Q30-Q34)")

Diagnosis Index entries for Q34.1

• Cyst (colloid) (mucous) (simple) (retention) › congenital NEC › mediastinum
• Cyst (colloid) (mucous) (simple) (retention) › mediastinum, congenital

Nearby codes

• Q34 Other congenital malformations of respiratory system
• Q34.0 Anomaly of pleura
• Q34.1 Congenital cyst of mediastinum (this code)
• Q34.8 Other specified congenital malformations of respiratory system
• Q34.9 Congenital malformation of respiratory system, unspecified