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ICD-10-CM Code K31.1
Adult hypertrophic pyloric stenosis

Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
Adult Only
Adult Only
Code is only used for patients 15 years old or older.
| ICD-10 from 2011 - 2016

K31.1 is a billable ICD code used to specify a diagnosis of adult hypertrophic pyloric stenosis. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code K311 is used to code Pyloric stenosis

Pyloric stenosis or pylorostenosis is narrowing (stenosis) of the opening from the stomach to the first part of the small intestine known as the duodenum, due to enlargement (hypertrophy) of the muscle surrounding this opening (the pylorus, meaning "gate"), which spasms when the stomach empties. This condition causes severe projectile non-bilious vomiting. It most often occurs in the first few months of life, when it may thus be more specifically labeled as infantile hypertrophic pyloric stenosis. The thickened pylorus is felt classically as an olive-shaped mass in the middle upper part or right upper quadrant of the infant's abdomen. In pyloric stenosis, it is uncertain whether there is a true congenital anatomic narrowing or whether there is merely a functional hypertrophy of the pyloric sphincter muscle. This condition typically develops in male babies in the first 2 to 6 weeks of life.

Specialty: General Surgery
MeSH Codes: D046248, D046248
ICD 9 Codes: 537.0, 750.5

Outline of stomach, showing its anatomical landmarks, including the pylorus.

Source: Wikipedia

Coding Notes for K31.1 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Pyloric stenosis NOS
Code Type-1 Excludes:
Type-1 Excludes
Type-1 Excludes mean the conditions excluded are mutually exclusive and should never be coded together. Excludes 1 means "do not code here."
Congenital or infantile pyloric stenosis - instead, use code Q40.0

MS-DRG Mapping

  • DRG Group #380-384 - Complicated peptic ulcer with MCC.
  • DRG Group #380-384 - Complicated peptic ulcer with CC.
  • DRG Group #380-384 - Complicated peptic ulcer without CC or MCC.
  • DRG Group #380-384 - Uncomplicated peptic ulcer with MCC.
  • DRG Group #380-384 - Uncomplicated peptic ulcer without MCC.

Related Concepts SNOMET-CT

  • Acquired hypertrophic pyloric stenosis (disorder)
  • Acquired pyloric constriction (disorder)
  • Gastric outlet obstruction due to gallstone (disorder)


Acquired hypertrophic pyloric stenosis (exact match)

This is the official exact match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that in all cases where the ICD9 code 537.0 was previously used, K31.1 is the appropriate modern ICD10 code.

Parent Code: K31 - Other diseases of stomach and duodenum

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/K311