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Q42.1 ICD-10-CA code: Congenital absence, atresia and stenosis of rectum without fistula

Q42.1 is the ICD-10-CA code for “Congenital absence, atresia and stenosis of rectum without fistula” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

Q42.1

Congenital absence, atresia and stenosis of rectum without fistula

Short description: Congen absnce atrs stenos rectum wo fist

ICD-10-CA · Canada · Also written Q421

Index terms

Entries in CIHI’s alphabetical index that lead to Q42.1. Searching the index by the condition the note names is how coders reach this code.

  • Agenesis, rectum
  • Atresia, atretic, rectum
  • Hypoplasia, hypoplastic, rectum
  • Impervious (congenital), rectum
  • Imperforate (congenital), rectum
  • Stricture, rectum (sphincter), congenital
  • Absence (organ or part) (complete or partial), rectum (congenital)

Notes for Q42.1

As CIHI prints them, with any note Q42.1 takes from the headings above it.

Includes

Excludes

Conditions classified elsewhere.

  • Inborn errors of metabolism (E70-E90)From Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)

Where Q42.1 sits

  1. 1ChapterChapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  2. 2Block Q38-Q45Other congenital malformations of the digestive system
  3. 3Category Q42Congenital absence, atresia and stenosis of large intestine
  4. 4Valid code Q42.1Congenital absence, atresia and stenosis of rectum without fistula

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See Q42.1 in the CIHI source

Frequently asked questions

What does ICD-10-CA code Q42.1 mean?

Q42.1 is the ICD-10-CA code for “Congenital absence, atresia and stenosis of rectum without fistula” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is Q42.1 in ICD-10-CA?

Q42.1 sits under Q42 Congenital absence, atresia and stenosis of large intestine, within Q38-Q45 Other congenital malformations of the digestive system, within Chapter 17: Congenital malformations, deformations and chromosomal abnormalities (Q00-Q99).

What coding notes apply to Q42.1?

ICD-10-CA lists Includes, Excludes notes for Q42.1, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside Q42.1

Q42.0Congenital absence, atresia and stenosis of rectum with fistulaQ42.2Congenital absence, atresia and stenosis of anus with fistulaQ42.3Congenital absence, atresia and stenosis of anus without fistulaQ42.8Congenital absence, atresia and stenosis of other parts of large intestineQ42.9Congenital absence, atresia and stenosis of large intestine, part unspecified