Adult hypertrophic pyloric stenosis

This code represents a rare condition in adults where the muscular wall of the pylorus, the opening from the stomach to the small intestine, thickens abnormally. This thickening obstructs the passage of food, leading to symptoms like nausea, vomiting, and weight loss. It is distinct from the more common infantile form.

Use this code for adult patients diagnosed with acquired hypertrophic pyloric stenosis. Documentation should clearly indicate the patient's age (adult) and diagnostic findings such as imaging (e.g., endoscopy, barium swallow) confirming pyloric muscle hypertrophy and obstruction.

• Ensure documentation specifies "adult" or "acquired" to differentiate from congenital forms.
• Do not code with Q40.0, as this is an Excludes1 note indicating these conditions are mutually exclusive.
• Look for associated symptoms like projectile vomiting, epigastric pain, and early satiety in the clinical notes.