ICD-10-CM 2027 diagnosis code

Q34Other congenital malformations of respiratory system

Not billable — use a more specific code

Q34 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q34

Q34 is the ICD-10-CM diagnosis code for other congenital malformations of respiratory system. It belongs to block Q30-Q34 (congenital malformations of the respiratory system) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Q34.0 (pleura), Q34.1 (mediastinum), Q34.8 (system) and Q34.9 (unspecified).

The conditions in its Excludes2 note aren't part of Q34, but may be coded alongside it if the patient has both: congenital central alveolar hypoventilation syndrome (G47.35).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under Q34

Coding notes

Excludes2Not included here — may be reported together if both conditions exist

congenital central alveolar hypoventilation syndrome (G47.35)

Notes that apply from higher levels

Instructions written at a parent level also apply to Q34.

Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Codes whose notes reference Q34

P28Code also

Code history

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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about Q34

Is Q34 billable?: No. Q34 is a header code. Report one of its more specific subcodes instead.