Q42.3 Congenital absence, atresia and stenosis of anus without fistula

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis. Exempt from present-on-admission (POA) reporting.

Applicable to

• Imperforate anus

Applies from Q42 Congenital absence, atresia and stenosis of large intestine

Includes

• congenital obstruction, occlusion and stricture of large intestine

Risk adjustment (HCC)

• CMS-HCC V28: HCC 78 — Intestinal Obstruction/Perforation

MS-DRG index

Defines the logic of DRG(s) 393-395 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 751.2 Atresia and stenosis of large intestine, rectum, and anal canal (approximate)

Code annotations containing back-references to Q42.3

Back-references to Q42

• Type 1 Excludes: K56 Paralytic ileus and intestinal obstruction without hernia ("congenital stricture or stenosis of intestine (Q41-Q42)")

Diagnosis Index entries for Q42.3

• Absence (of) (organ or part) (complete or partial) › anus (congenital)
• Agenesis › anus, anal (canal)
• Atresia, atretic › ani, anus, anal (canal)
• Hypoplasia, hypoplastic › anus, anal (canal)
• Imperforate (congenital) › anus
• Impervious (congenital) › anus
• Occlusion, occluded › anus › congenital
• Persistence, persistent (congenital) › anal membrane
• Septum, septate (congenital) › anal
• Stenosis, stenotic (cicatricial) › anus, anal (canal) (sphincter) › congenital
• Stricture › anus (sphincter) › congenital
• Stricture › anus (sphincter) › infantile

Nearby codes

• Q42 Congenital absence, atresia and stenosis of large intestine
• Q42.0 Congenital absence, atresia and stenosis of rectum with fistula
• Q42.1 Congenital absence, atresia and stenosis of rectum without fistula
• Q42.2 Congenital absence, atresia and stenosis of anus with fistula
• Q42.3 Congenital absence, atresia and stenosis of anus without fistula (this code)
• Q42.8 Congenital absence, atresia and stenosis of other parts of large intestine
• Q42.9 Congenital absence, atresia and stenosis of large intestine, part unspecified