Acquired hypertrophic pyloric stenosis

This diagnosis code signifies a narrowing of the pylorus, the opening from the stomach to the small intestine, that develops after birth. This hypertrophy of the pyloric muscle obstructs gastric outflow, leading to symptoms like projectile vomiting. It is distinct from congenital forms of the condition.

Assign this code for adults or older children diagnosed with pyloric stenosis that is not present at birth. Documentation should clearly state "acquired" or indicate an onset later in life, differentiating it from congenital pyloric stenosis. This code is appropriate when surgical intervention, such as pyloromyotomy, is performed to relieve the obstruction.

• Differentiate carefully from congenital hypertrophic pyloric stenosis, which has a separate code.
• Ensure documentation specifies "acquired" or provides a clear history of later onset.
• Consider additional codes for associated symptoms like dehydration or malnutrition if documented.