Is C18.1 a billable ICD-10-CM code?

Yes. C18.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does C18.1 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neoplasms of digestive organs (C15-C26).

C18.1

C18.1 — Malignant neoplasm of appendix

Billable / specific codeICD-10-CM

C18.1 is a billable, specific ICD-10-CM code for malignant neoplasm of appendix. It is valid for submission on a claim.

Risk adjustment

C18.1 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 22 Bladder, Colorectal, and Other Cancers0.363 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

C18.1 is named in 102 Medicare coverage policies — 102 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

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How C18.1 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to C18.1.

Tumor›mucocarcinoid›unspecified site

Related codes at this level

Codes that share C18. If C18.1 is not quite right, the correct code is usually one of these.

Questions about C18.1

Is C18.1 a billable ICD-10-CM code?: Yes. C18.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does C18.1 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neoplasms of digestive organs (C15-C26).