C26Header code — not billable

Malignant neoplasm of other and ill-defined digestive organs

Chapter
2. Neoplasms
Category
C26
Effective date
October 1, 2026

Related codes in category C26

C26.0Malignant neoplasm of intestinal tract, part unspecifiedYesC26.1Malignant neoplasm of spleenYesC26.9Malignant neoplasm of ill-defined sites within the dgstv sysYes

Frequently asked questions

What is ICD-10 code C26?

C26 is an ICD-10-CM diagnosis code for Malignant neoplasm of other and ill-defined digestive organs.

Is C26 a billable code?

No. C26 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is C26 in?

C26 falls under Chapter 2: Neoplasms.

When did C26 become effective?

C26 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to C26?

C26 belongs to category C26, which includes 3 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.