Alphabetic Index FY2027

K51.31

Ulcerative (chronic) rectosigmoiditis with complications

FY2027Chapter 11: Diseases of the digestive system/K50–K52 Noninfective enteritis and colitis

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

K51.31 is a non-billable ICD-10-CM code header for ulcerative (chronic) rectosigmoiditis with complications. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are 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 and 2 more. Its coding notes include a Use additional code instruction, 3 Excludes1 entries and 8 Excludes2 entries.

Use additional code

Add the listed code as a secondary code, if known.

Inherited from K51 Ulcerative colitis
  • code to identify any associated fistulas, if applicable:
  • code to identify manifestations, such as:
    • pyoderma gangrenosum (L88)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from K51 Ulcerative colitis
  • Crohn's disease [regional enteritis] (K50.-)
Also from chapter/block level (2 notes)
Inherited from K50–K52 Noninfective enteritis and colitis

Excludes2

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

Also from chapter/block level (8 notes)
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.

Also from chapter/block level (1 note)
Inherited from K50–K52 Noninfective enteritis and colitis
  • noninfective inflammatory bowel disease

More specific codes under K51.31 6