K31.2 vs Q40.2
K31.2 and Q40.2 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.
Hourglass stricture and stenosis of stomach
- Chapter 11
- Diseases of the digestive system
- Section
- K20-K31
- Bilocular stomach
- Cascade stomach
- Deformity › cascade, stomach
- Stenosis, stenotic › stomach, hourglass
- Stricture › hourglass, of stomach
Other specified congenital malformations of stomach
- Chapter 17
- Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders
- Section
- Q38-Q45
- Congenital displacement of stomach
- Congenital diverticulum of stomach
- Congenital hourglass stomach
- Congenital duplication of stomach
- Megalogastria
- Microgastria
- Microgastria (congenital)
- Agenesis › gastric
- Agenesis › stomach
- Anomaly, anomalous › cascade stomach
- Anomaly, anomalous › hourglass stomach
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027