NPI Atlas

ICD-10 Code for Megacolon

The default ICD-10-CM 2027 code for megacolon (acquired) (functional) (not Hirschsprung's disease) (in) is K59.39 – Other megacolon. More specific codes depend on the details documented, as listed in the official index (6 codes, 6 billable).

Main code: K59.39 – Other megacolon
Billable: Yes

Index entries for Megacolon

Chagas' disease – B57.32
congenital, congenitum (aganglionic) – Q43.1
Hirschsprung's (disease) – Q43.1
toxic NEC – K59.31
- due to
  - Clostridioides difficile
    - not specified as recurrent – A04.72
    - recurrent – A04.71
  - Clostridium difficile
    - not specified as recurrent – A04.72
    - recurrent – A04.71

How to choose the right code

Start with the main term, then pick the indented subterm that matches the documentation (type, cause, site, laterality, episode of care). Always confirm the code in the tabular list: follow its Excludes1/Excludes2, “code first” and “use additional code” notes, and add a 7th character where required.

Source: CDC/NCHS ICD-10-CM FY2027 alphabetic index.