ICD-10-CM 2027 diagnosis code

Q31Congenital malformations of larynx

Not billable — use a more specific code

Q31 is a header code, so it can't be reported by itself. Choose one of the 7 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 Q31

Q31 is the ICD-10-CM diagnosis code for congenital malformations of larynx. 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 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Q31.0 (larynx), Q31.1 (stenosis), Q31.2 (hypoplasia), Q31.3 (Laryngocele), Q31.5 (laryngomalacia), Q31.8 (larynx) and Q31.9 (unspecified).

Don't report Q31 together with the conditions in its Excludes1 note: congenital laryngeal stridor NOS (P28.89).

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 Q31

Coding notes

Excludes1Not coded here — never report together with this code

congenital laryngeal stridor NOS (P28.89)

Notes that apply from higher levels

Instructions written at a parent level also apply to Q31.

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

Code history

2016
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2021
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2025
2026
2027

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

Common questions about Q31

Is Q31 billable?: No. Q31 is a header code. Report one of its more specific subcodes instead.