AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2026 Quarter 4; New/Revised ICD-10-CM Codes

Pediatric Hypertrophic Pyloric Stenosis

Code K31.B , Hypertrophic pyloric stenosis, in childhood, was created to differentiate pediatric and childhood hypertrophic stenosis from congenital hypertrophic pyloric stenosis. Pediatric pyloric stenosis, also known as infantile hypertrophic pyloric stenosis, and hypertrophic pyloric stenosis, is a condition that is characterized by abnormal thickening of the pylorus muscle in the stomach leading to gastric outlet obstruction. This condition is the most common cause of gastric outlet obstruction which requires surgical intervention. Prior to October 1, 2026, code Q40.0 , Congenital hypertrophic pyloric stenosis, was used to capture both congenital and infantile pyloric stenosis. ...

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