Q34.9
Congenital malformation of respiratory system, unspecified
Q34.9 (also written Q349) is a billable ICD-10-CM diagnosis code for congenital malformation of respiratory system, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 4 codes in category Q34 (Other congenital malformations of respiratory system). The Alphabetic Index lists it under 6 entries. Its coding notes include 2 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- congenital central alveolar hypoventilation syndrome (G47.35)
Also from chapter/block level (1 note)
- inborn errors of metabolism (E70-E88)
Inclusion terms
Conditions classified to this code.
- Congenital absence of respiratory system
- Congenital anomaly of respiratory system NOS
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 6 entries
- Absence (of) (organ or part) (complete or partial), respiratory organ NOS
- Anomaly, anomalous (congenital) (unspecified type), respiratory system
- Defect, defective, respiratory system, congenital
- Deformity, respiratory system (congenital)
- Development, incomplete, respiratory system
- Malformation (congenital), respiratory system