K31.B
✓ Billable
Hypertrophic pyloric stenosis, in childhood
ICD-10-CM · FY2026 · Diseases of the Digestive System
Code
K31.B
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Digestive System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Also known as
- Infantile hypertrophic pyloric stenosis
- Pediatric hypertrophic pyloric stenosis
- Pediatric pyloric stenosis
Includes
- functional disorders of stomach
Excludes1 — never code together
- congenital pyloric stenosis (Q40.0)
Excludes2 — not included here, but may code together
- diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
- diverticulum of duodenum (K57.00-K57.13)
Frequently asked questions
What is ICD-10 code K31.B?
ICD-10-CM code K31.B represents Hypertrophic pyloric stenosis, in childhood. It is a billable diagnosis code in the Diseases of the Digestive System chapter, effective October 1, 2025 – September 30, 2026.
Is K31.B billable?
Yes. K31.B is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is K31.B in?
K31.B belongs to the Diseases of the Digestive System chapter (K00–K95) of ICD-10-CM.
Related codes in the K31 category
K31
Other diseases of stomach and duodenum
Non-billable
K31.0
Acute dilatation of stomach
Billable
K31.1
Adult hypertrophic pyloric stenosis
Billable
K31.2
Hourglass stricture and stenosis of stomach
Billable
K31.3
Pylorospasm, not elsewhere classified
Billable
K31.4
Gastric diverticulum
Billable
K31.5
Obstruction of duodenum
Billable
K31.6
Fistula of stomach and duodenum
Billable
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