Chapter 11

K00–K95: Diseases of the Digestive System

Diseases of the Digestive System diagnostic classification updated for 2026.

Chapter Instructions

Excludes2(Not included here. Code separately if applicable.)

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)

All Codes Billable Only

Internal Codes

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K50.919|
Crohn's disease, unspecified, with unspecified complications
K51.00|
Ulcerative (chronic) pancolitis without complications
K51.011|
Ulcerative (chronic) pancolitis with rectal bleeding
K51.012|
Ulcerative (chronic) pancolitis with intestinal obstruction
K51.013|
Ulcerative (chronic) pancolitis with fistula
K51.014|
Ulcerative (chronic) pancolitis with abscess
K51.018|
Ulcerative (chronic) pancolitis with other complication
K51.019|
Ulcerative (chronic) pancolitis with unspecified complications
K51.20|
Ulcerative (chronic) proctitis without complications
K51.211|
Ulcerative (chronic) proctitis with rectal bleeding
K51.212|
Ulcerative (chronic) proctitis with intestinal obstruction
K51.213|
Ulcerative (chronic) proctitis with fistula
K51.214|
Ulcerative (chronic) proctitis with abscess
K51.218|
Ulcerative (chronic) proctitis with other complication
K51.219|
Ulcerative (chronic) proctitis with unspecified complications
K51.30|
Ulcerative (chronic) rectosigmoiditis without complications
K51.311|
Ulcerative (chronic) rectosigmoiditis with rectal bleeding
K51.312|
Ulcerative (chronic) rectosigmoiditis with intestinal obstruction
K51.313|
Ulcerative (chronic) rectosigmoiditis with fistula
K51.314|
Ulcerative (chronic) rectosigmoiditis with abscess
K51.318|
Ulcerative (chronic) rectosigmoiditis with other complication
K51.319|
Ulcerative (chronic) rectosigmoiditis with unspecified complications
K51.40|
Inflammatory polyps of colon without complications
K51.411|
Inflammatory polyps of colon with rectal bleeding
K51.412|
Inflammatory polyps of colon with intestinal obstruction
K51.413|
Inflammatory polyps of colon with fistula
K51.414|
Inflammatory polyps of colon with abscess
K51.418|
Inflammatory polyps of colon with other complication
K51.419|
Inflammatory polyps of colon with unspecified complications
K51.50|
Left sided colitis without complications
K51.511|
Left sided colitis with rectal bleeding
K51.512|
Left sided colitis with intestinal obstruction
K51.513|
Left sided colitis with fistula
K51.514|
Left sided colitis with abscess
K51.518|
Left sided colitis with other complication
K51.519|
Left sided colitis with unspecified complications
K51.80|
Other ulcerative colitis without complications
K51.811|
Other ulcerative colitis with rectal bleeding
K51.812|
Other ulcerative colitis with intestinal obstruction
K51.813|
Other ulcerative colitis with fistula
K51.814|
Other ulcerative colitis with abscess
K51.818|
Other ulcerative colitis with other complication
K51.819|
Other ulcerative colitis with unspecified complications
K51.90|
Ulcerative colitis, unspecified, without complications
K51.911|
Ulcerative colitis, unspecified with rectal bleeding
K51.912|
Ulcerative colitis, unspecified with intestinal obstruction
K51.913|
Ulcerative colitis, unspecified with fistula
K51.914|
Ulcerative colitis, unspecified with abscess
K51.918|
Ulcerative colitis, unspecified with other complication
K51.919|
Ulcerative colitis, unspecified with unspecified complications

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