K31.1 – Adult hypertrophic pyloric stenosis

ICD-10-CM 2027 diagnosis code · Diseases of esophagus, stomach and duodenum

Billable code

ICD-10-CM code K31.1

Code: K31.1 (claims format: K311)
Description: Adult hypertrophic pyloric stenosis
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 11. Diseases of the digestive system (K00-K95)
Block: K20-K31 Diseases of esophagus, stomach and duodenum
Parent codes: K31

Notes for K31.1

Applicable to:

Acquired hypertrophic pyloric stenosis
Adult pyloric stenosis
Pyloric stenosis NOS

Excludes1 (not coded here):

congenital pyloric stenosis (Q40.0)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

K31 – Other diseases of stomach and duodenum

Includes:

functional disorders of stomach

Excludes2 (not included here):

diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43)
diverticulum of duodenum (K57.00-K57.13)

Block K20-K31

Excludes2 (not included here):

hiatus hernia (K44.-)

Index terms for K31.1

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in K31

K31.0 – Acute dilatation of stomachBillable
K31.B – Hypertrophic pyloric stenosis, in childhoodBillable
K31.2 – Hourglass stricture and stenosis of stomachBillable
K31.3 – Pylorospasm, not elsewhere classifiedBillable
K31.4 – Gastric diverticulumBillable
K31.5 – Obstruction of duodenumBillable
K31.6 – Fistula of stomach and duodenumBillable
K31.7 – Polyp of stomach and duodenumBillable
K31.8 – Other specified diseases of stomach and duodenumHeader
K31.9 – Disease of stomach and duodenum, unspecifiedBillable
K31.A – Gastric intestinal metaplasiaHeader

Frequently asked questions

What is ICD-10 code K31.1?

K31.1 is the ICD-10-CM code for adult hypertrophic pyloric stenosis, in the block K20-K31 (Diseases of esophagus, stomach and duodenum).

Is K31.1 a billable code?

Yes. K31.1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K31.1 belong to?

It belongs to category K31 – Other diseases of stomach and duodenum.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.