Is C18.1 a billable ICD-10 code?

Yes. C18.1 (Malignant neoplasm of appendix) is billable and can be used for insurance claims. Always verify payer-specific requirements.

C18.1 ✓ Billable

Malignant neoplasm of appendix

Q: What is ICD-10 code C18.1?

ICD-10-CM code C18.1 stands for "Malignant neoplasm of appendix". It is a billable code in the Neoplasms chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Neoplasms

Code

C18.1

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 C18.1?

ICD-10-CM code C18.1 represents Malignant neoplasm of appendix. It is a billable diagnosis code in the Neoplasms chapter, effective October 1, 2025 – September 30, 2026.

Is C18.1 billable?

Yes. C18.1 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is C18.1 in?

C18.1 belongs to the Neoplasms chapter (C00–D49) of ICD-10-CM.

Related codes in the C18 category

C18 Malignant neoplasm of colon Non-billable C18.0 Malignant neoplasm of cecum Billable C18.2 Malignant neoplasm of ascending colon Billable C18.3 Malignant neoplasm of hepatic flexure Billable C18.4 Malignant neoplasm of transverse colon Billable C18.5 Malignant neoplasm of splenic flexure Billable C18.6 Malignant neoplasm of descending colon Billable C18.7 Malignant neoplasm of sigmoid colon Billable

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