Q42: Congenital absence, atresia and stenosis of large intestine

Codes under Q42 (Congenital absence, atresia and stenosis of large intestine). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
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	✓
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	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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