K51.818

Other ulcerative colitis with other complication

Billable FY2026 2025-10-01 → 2026-09-30

Exclusions 11 never code together

K51code

Excludes1

Crohn's disease [regional enteritis] (K50.-)K50.-

K50-K52block

Excludes1

irritable bowel syndrome (K58.-)K58.-
megacolon (K59.3-)K59.3-

K00-K95chapter

Excludes2

certain conditions originating in the perinatal period (P04-P96)P04-P96
certain infectious and parasitic diseases (A00-B99)A00-B99
complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Q00-Q99
endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
neoplasms (C00-D49)C00-D49
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 7

K51code

Use additional code

code to identify any associated fistulas, if applicable:
anal fistula (K60.3-)K60.3-
anorectal fistula (K60.5-)K60.5-
rectal fistula (K60.4-)K60.4-
code to identify manifestations, such as:
pyoderma gangrenosum (L88)L88

K50-K52block

Includes

noninfective inflammatory bowel disease

Index entries leading here 1

Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) K52.9
- ulcerative (chronic) K51.90
  - specified type NEC K51.80
    - with
      - complication K51.819
        
        specified complication NEC K51.818

Alongside this code 5 same parent — K51.81

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 K51.819 Other ulcerative colitis with unspecified complications

Medications 1

109 Colitis, Ulcerative drugs

MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

CMS22HCC35 CMS28HCC81 ESRD21HCC35 ESRD24HCC35 RX08HCC67

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable: yes
Code set: FY2026
Parent: K51.81
Block: K50-K52
Siblings: 5

Present FY2024–FY2027.