C04Header code — not billable

Malignant neoplasm of floor of mouth

Chapter
2. Neoplasms
Category
C04
Effective date
October 1, 2026

Related codes in category C04

C04.0Malignant neoplasm of anterior floor of mouthYesC04.1Malignant neoplasm of lateral floor of mouthYesC04.8Malignant neoplasm of overlapping sites of floor of mouthYesC04.9Malignant neoplasm of floor of mouth, unspecifiedYes

Frequently asked questions

What is ICD-10 code C04?

C04 is an ICD-10-CM diagnosis code for Malignant neoplasm of floor of mouth.

Is C04 a billable code?

No. C04 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 C04 in?

C04 falls under Chapter 2: Neoplasms.

When did C04 become effective?

C04 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to C04?

C04 belongs to category C04, which includes 4 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.