K59.39

Other megacolon

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

Exclusions 16 never code together

K59code

Excludes1

change in bowel habit NOS (R19.4)R19.4
intestinal malabsorption (K90.-)K90.-
psychogenic intestinal disorders (F45.8)F45.8

Excludes2

functional disorders of stomach (K31.-)K31.-

K59.3code

Excludes1

congenital megacolon (aganglionic) (Q43.1)Q43.1
megacolon (due to) (in) Chagas' disease (B57.32)B57.32
megacolon (due to) (in) Clostridium difficile (A04.7-)A04.7-
megacolon (due to) (in) Hirschsprung's disease (Q43.1)Q43.1

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 3

K59.39code

Inclusion terms

Megacolon NOS

K59.3code

Inclusion terms

Dilatation of colon

Code first

, if applicable (T51-T65) to identify toxic agentT51-T65

Index entries leading here 6

Excess, excessive, excessively
- large
  - colon K59.39
Dilatation
- colon K59.39
- rectum K59.39
Syndrome — see also Disease
- faulty bowel habit K59.39
Macrosigmoid K59.39
Megacolon (acquired) (functional) (not Hirschsprung's disease) (in) K59.39
Megasigmoid K59.39

Alongside this code 1 same parent — K59.3

K59.31 Toxic megacolon

Medications 2

26 Megacolon drugs 26 Megacolon, Toxic 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

Maps to no condition category in any loaded model.

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

This code

Billable: yes
Code set: FY2026
Parent: K59.3
Block: K55-K64
Siblings: 1

Present FY2024–FY2027.