K31 – Other diseases of stomach and duodenum
ICD-10-CM 2027 diagnosis code · Diseases of esophagus, stomach and duodenum
ICD-10-CM code
K31
- Code
K31(claims format:K31)- Description
- Other diseases of stomach and duodenum
- Billable
- No – use a more specific code below
- 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
Billable codes under K31
K31 is a header code and cannot be used on claims. Choose the most specific code:
- K31.0 – Acute dilatation of stomachBillable
- K31.1 – Adult hypertrophic pyloric stenosisBillable
- K31.B – Hypertrophic pyloric stenosis, in childhoodBillable · New in 2027
- 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 (more codes below)
- K31.9 – Disease of stomach and duodenum, unspecifiedBillable
- K31.A – Gastric intestinal metaplasiaHeader (more codes below)
Notes for K31
Includes:
- functional disorders of stomach
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block K20-K31
Excludes2 (not included here):
- hiatus hernia (K44.-)
Frequently asked questions
What is ICD-10 code K31?
K31 is the ICD-10-CM code for other diseases of stomach and duodenum, in the block K20-K31 (Diseases of esophagus, stomach and duodenum).
Is K31 a billable code?
No. K31 is a header code with more specific child codes; report one of the billable codes listed above.
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.