ICD-10-CM 2027 diagnosis code

Q42Congenital absence, atresia and stenosis of large intestine

Not billable — use a more specific code

Q42 is a header code, so it can't be reported by itself. Choose one of the 6 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 Q42

Q42 is the ICD-10-CM diagnosis code for congenital absence, atresia and stenosis of large intestine. It belongs to block Q38-Q45 (other congenital malformations of the digestive 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 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Q42.0 (fistula), Q42.1 (fistula), Q42.2 (fistula), Q42.3 (fistula), Q42.8 (intestine) and Q42.9 (part unspecified).

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 Q42

Coding notes

IncludesFurther defines the content of the category

congenital obstruction, occlusion and stricture of large intestine

Notes that apply from higher levels

Instructions written at a parent level also apply to Q42.

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

Codes whose notes reference Q42

K56Excludes1

Code history

2016
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2023
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2026
2027

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

Common questions about Q42

Is Q42 billable?: No. Q42 is a header code. Report one of its more specific subcodes instead.