K31.A11
Gastric intestinal metaplasia without dysplasia, involving the antrum
K31.A11 (also written K31A11) is a billable ICD-10-CM diagnosis code for gastric intestinal metaplasia without dysplasia, involving the antrum. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 26 codes in category K31 (Other diseases of stomach and duodenum). The Alphabetic Index lists it under 1 entry. Its coding notes include 11 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (9 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Gastrointestinal tract and Genitourinary system clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Includes
Further defines or gives examples of the content of the category.
- functional disorders of stomach
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry