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K59.3

Non-billable

Megacolon, not elsewhere classified

K59.3 is the ICD-10-CM code for Megacolon, not elsewhere classified. It is a non-billable category code — use a more specific child code such as K59.31 for billing.

Status
Header (non-billable)
Chapter
K00-K95
Parent
K59
Subcodes
2
Edition
FY2026

K00-K95 Diseases of the digestive system

What this means — in plain language

MedlinePlus · NIH

When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion. Your digestive system is a series of hollow organs joined in a long, twisting tube. It runs from your mouth to your anus and includes your esophagus, stomach, and small and large intestines. Your liver, gallbladder and pancreas are also involved. They produce juices to help…

Read more about Digestive Diseases at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Includes

  • •Dilatation of colon

Excludes1 — not coded here

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

Code first

  • •, if applicable (T51-T65) to identify toxic agent

Medications indicated for this condition

FDA labeling

Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.

Conditions mapped to this code

MedlinePlus · NIH
ConstipationDiarrhea

Plain-language health-topic references grounded in MedlinePlus (NIH/NLM).

Frequently asked questions

What is ICD-10 code K59.3?
K59.3 is the ICD-10-CM code for "Megacolon, not elsewhere classified". It falls under K00-K95 Diseases of the digestive system.
Is K59.3 a billable code?
No — K59.3 is a non-billable header code. Use a more specific child code (such as K59.31) for billing.
What are the subcodes of K59.3?
K59.3 has 2 more specific child codes, including K59.31, K59.39.
What is excluded from K59.3?
Excludes1 (not coded here): congenital megacolon (aganglionic) (Q43.1); megacolon (due to) (in) Chagas' disease (B57.32); megacolon (due to) (in) Clostridium difficile (A04.7-); megacolon (due to) (in) Hirschsprung's disease (Q43.1).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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