Alphabetic Index FY2027

K31.9

Disease of stomach and duodenum, unspecified

FY2027Chapter 11: Diseases of the digestive system/K20–K31 Diseases of esophagus, stomach and duodenum

BillableComplete code, valid to report

K31.9 (also written K319) is a billable ICD-10-CM diagnosis code for disease of stomach and duodenum, unspecified. 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 12 entries. Its coding notes include 11 Excludes2 entries.

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from K31 Other diseases of stomach and duodenum
Also from chapter/block level (9 notes)
Inherited from K20–K31 Diseases of esophagus, stomach and duodenum
Inherited from Chapter 11 Diseases of the digestive system
  • 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)

Includes

Further defines or gives examples of the content of the category.

Inherited from K31 Other diseases of stomach and duodenum
  • functional disorders of stomach

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 12 entries