ICD-10 Code for Megacolon

Also indexed as (acquired) (functional) (not Hirschsprung's disease) (in)

The ICD-10-CM code for megacolon is K59.39 — Other megacolon. This is the code the Alphabetic Index gives for megacolon with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).

Billable

Which megacolon code should you use?

The Alphabetic Index lists 6 codes under Megacolon. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.

By type

Chagas' disease	B57.32	Megacolon in Chagas' disease
congenital, congenitum	Q43.1	Hirschsprung's disease
Hirschsprung's	Q43.1	Hirschsprung's disease
toxic NEC	K59.31	Toxic megacolon

Megacolon toxic NEC

due to › Clostridioides difficile › not specified as recurrent	A04.72	Enterocolitis due to Clostridium difficile, not specified as recurrent
due to › Clostridioides difficile › recurrent	A04.71	Enterocolitis due to Clostridium difficile, recurrent
due to › Clostridium difficile › not specified as recurrent	A04.72	Enterocolitis due to Clostridium difficile, not specified as recurrent
due to › Clostridium difficile › recurrent	A04.71	Enterocolitis due to Clostridium difficile, recurrent

Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources