Q42

Congenital absence, atresia and stenosis of large intestine

Header / non-billable

Choose the additional character

Q42 needs more characters to be billable. Pick the specific code below.

Q42.0Congenital absence, atresia and stenosis of rectum with fistulaBillable
Q42.1Congenital absence, atresia and stenosis of rectum without fistulaBillable
Q42.2Congenital absence, atresia and stenosis of anus with fistulaBillable
Q42.3Congenital absence, atresia and stenosis of anus without fistulaBillable
Q42.8Congenital absence, atresia and stenosis of other parts of large intestineBillable
Q42.9Congenital absence, atresia and stenosis of large intestine, part unspecifiedBillable

This code does not map to a risk-adjusting HCC in the loaded models.

Coding notes

Excludes 1 never coded together · Excludes 2 may co-exist

This code · Q42

Includes

congenital obstruction, occlusion and stricture of large intestine

Inherited from chapter 17Congenital malformations, deformations and chromosomal abnormalities

Excludes 2

inborn errors of metabolism (E70-E88)

Note

Codes from this chapter are not for use on maternal records

Official Guidelines for Q42

I.C.17Chapter-specific guidanceChapter 17: Congenital malformations, deformations, and chromosomal abnormalities (Q00-QA1)

Sections that reference Q42

IV.QEncounters for routine health screeningsOutpatient services
… Congenital conditions and anomalies Assign “Y” for congenital conditions and anomalies except for categories Q00- Q99, Congenital anomalies, which are on the exempt list. …

Sections whose FY 2026 text names Q42, its Q42 category, or a range containing it — the chapter guidance above is the authoritative source.