K31.A21 – Gastric intestinal metaplasia with low grade dysplasia

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

Billable code

ICD-10-CM code K31.A21

Code: K31.A21 (claims format: K31A21)
Description: Gastric intestinal metaplasia with low grade dysplasia
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 › K31.A › K31.A2

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.A21

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

Metaplasia, gastric intestinal, with dysplasia, low grade

Related codes in K31.A2

Frequently asked questions

What is ICD-10 code K31.A21?

K31.A21 is the ICD-10-CM code for gastric intestinal metaplasia with low grade dysplasia, in the block K20-K31 (Diseases of esophagus, stomach and duodenum).

Is K31.A21 a billable code?

Yes. K31.A21 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does K31.A21 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.