Disease of stomach and duodenum, unspecified
Billable / specific
K31.9 is a billable, specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes in FY2027.
Inclusion terms
Includes (from K31)
- functional disorders of stomach
Excludes2
Not included here — may be reported together when both conditions exist.
- certain conditions originating in the perinatal period (P04-P96) (from K31)
- certain infectious and parasitic diseases (A00-B99) (from K31)
- complications of pregnancy, childbirth and the puerperium (O00-O9A) (from K31)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99) (from K31)
- endocrine, nutritional and metabolic diseases (E00-E88) (from K31)
- injury, poisoning and certain other consequences of external causes (S00-T88) (from K31)
- neoplasms (C00-D49) (from K31)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) (from K31)
- hiatus hernia (K44.-) (from K31)
- diabetic gastroparesis (E08.43, E09.43, E10.43, E11.43, E13.43) (from K31)
- diverticulum of duodenum (K57.00-K57.13) (from K31)
Also known as
- Disease, diseased, duodenum
- Disease, diseased, stomach
- Disorder, gastric
- Disturbance, stomach
- Dysfunction, pylorus
- Gastropathy
- Lesion, cardia
- Lesion, duodenum
- Lesion, gastric
- Lesion, gastroduodenal
- Lesion, pylorus
- Lesion, stomach
Parent code
- K31Other diseases of stomach and duodenumHeader
Related codes
- K31.0Acute dilatation of stomachBillable
- K31.1Adult hypertrophic pyloric stenosisBillable
- K31.BHypertrophic pyloric stenosis, in childhoodBillable
- K31.2Hourglass stricture and stenosis of stomachBillable
- K31.3Pylorospasm, not elsewhere classifiedBillable
- K31.4Gastric diverticulumBillable
- K31.5Obstruction of duodenumBillable
- K31.6Fistula of stomach and duodenumBillable
- K31.7Polyp of stomach and duodenumBillable
- K31.8Other specified diseases of stomach and duodenumHeader
- K31.AGastric intestinal metaplasiaHeader