K31.1
Adult hypertrophic pyloric stenosis
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
congenital or infantile pyloric stenosis (Q40.0)
Pyloric stenosis NOS
hiatus hernia (K44.-)
certain conditions originating in the perinatal period (P04-P96) certain infectious and parasitic diseases (A00-B99) complications of pregnancy, childbirth and the puerperium (O00-O9A) congenital malformations, deformations and chromosomal abnormalities (Q00-Q99) endocrine, nutritional and metabolic diseases (E00-E88) injury, poisoning and certain other consequences of external causes (S00-T88) neoplasms (C00-D49) symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Official Guidelines for K31.1
FY 2026 ›Find K31.1 in the alphabetic index
9 index paths lead to this code
- Constriction › pylorus
- Hypertrophy, hypertrophic › pylorus
- Obstruction, obstructed, obstructive › gastric outlet
- Occlusion, occluded › pylorus, adult
- Stenosis, stenotic › pylorus
- Stricture › pylorus
- Obstruction, obstructed, obstructive › pylorus › adult
- Stenosis, stenotic › pylorus › adult
- Stricture › pylorus › adult