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K31.1

Billable

Adult hypertrophic pyloric stenosis

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

A thickening of the muscle at the outlet of the stomach (pylorus) in adults that prevents food from moving into the small intestine.

Coding Tips

  • •Ensure documentation specifies this is in an adult, as infantile pyloric stenosis has a different code
  • •May require surgical intervention; coordinate with procedure codes if applicable

Excludes 1 — Do NOT code together

  • congenital or infantile pyloric stenosis (Q40.0)

Code Hierarchy

└K31Other diseases of stomach and duodenum└K31.1Adult hypertrophic pyloric stenosis
└K31.1Adult hypertrophic pyloric stenosis

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