Q34.9 Congenital malformation of respiratory system, unspecified

The ICD-10-CM code for Congenital malformation of respiratory system, unspecified is Q34.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

17: Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)

Section

Q30-Q34: Congenital malformations of the respiratory system (Q30-Q34)

Category Q34

5 codes (4 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Q34.9:

• Malformation (congenital) › respiratory system
• Deformity › respiratory system (congenital)
• Anomaly, anomalous (congenital) (unspecified type) › respiratory system
• Absence (of) (organ or part) (complete or partial) › respiratory organ NOS
• Defect, defective › respiratory system, congenital
• Development › incomplete › respiratory system

Inclusion Terms

• Congenital absence of respiratory system
• Congenital anomaly of respiratory system NOS

U.S. Hospital Utilization

• An estimated 105 U.S. inpatient stays in 2023 included Q34.9 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

POA indicator for congenital conditions/anomalies and Q00-Q99 exception

Congenital conditions and anomalies Assign “Y” for congenital conditions and anomalies except for categories Q00- Q99, Congenital anomalies, which are on the exempt list. Congenital conditions are always considered present on admission.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)