Is C00.4 a billable ICD-10 code?

Yes. C00.4 (Malignant neoplasm of lower lip, inner aspect) is billable and can be used for insurance claims. Always verify payer-specific requirements.

C00.4 ✓ Billable

Malignant neoplasm of lower lip, inner aspect

Q: What is ICD-10 code C00.4?

ICD-10-CM code C00.4 stands for "Malignant neoplasm of lower lip, inner aspect". It is a billable code in the Neoplasms chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Neoplasms

Code

C00.4

System

ICD-10-CM

Billable

Yes — valid for submission

Effective

FY2026

Chapter

Neoplasms

Source

CMS / CDC NCHS

⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Frequently asked questions

What is ICD-10 code C00.4?

ICD-10-CM code C00.4 represents Malignant neoplasm of lower lip, inner aspect. It is a billable diagnosis code in the Neoplasms chapter, effective October 1, 2025 – September 30, 2026.

Is C00.4 billable?

Yes. C00.4 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is C00.4 in?

C00.4 belongs to the Neoplasms chapter (C00–D49) of ICD-10-CM.

Related codes in the C00 category

C00 Malignant neoplasm of lip Non-billable C00.0 Malignant neoplasm of external upper lip Billable C00.1 Malignant neoplasm of external lower lip Billable C00.2 Malignant neoplasm of external lip, unspecified Billable C00.3 Malignant neoplasm of upper lip, inner aspect Billable C00.5 Malignant neoplasm of lip, unspecified, inner aspect Billable C00.6 Malignant neoplasm of commissure of lip, unspecified Billable C00.8 Malignant neoplasm of overlapping sites of lip Billable

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