| Q41 | Congenital absence, atresia and stenosis of small intestine |
| Q41.0 | Congenital absence, atresia and stenosis of duodenum |
| Q41.1 | Congenital absence, atresia and stenosis of jejunum |
| Q41.2 | Congenital absence, atresia and stenosis of ileum |
| Q41.8 | Congenital absence, atresia and stenosis of other specified parts of small intestine |
| Q41.9 | Congenital absence, atresia and stenosis of small intestine, part unspecified |
| 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 |
| 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 |