C03Header code — not billable

Malignant neoplasm of gum

Chapter
2. Neoplasms
Category
C03
Effective date
October 1, 2026

Related codes in category C03

C03.0Malignant neoplasm of upper gumYesC03.1Malignant neoplasm of lower gumYesC03.9Malignant neoplasm of gum, unspecifiedYes

Frequently asked questions

What is ICD-10 code C03?

C03 is an ICD-10-CM diagnosis code for Malignant neoplasm of gum.

Is C03 a billable code?

No. C03 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 C03 in?

C03 falls under Chapter 2: Neoplasms.

When did C03 become effective?

C03 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to C03?

C03 belongs to category C03, 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.