Is C7A.021 a billable ICD-10-CM code?

Yes. C7A.021 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does C7A.021 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neuroendocrine tumors (C7A).

C7A.021

C7A.021 — Malignant carcinoid tumor of the cecum

Billable / specific codeICD-10-CM

C7A.021 is a billable, specific ICD-10-CM code for malignant carcinoid tumor of the cecum. It is valid for submission on a claim.

Excludes2 inherited from the categories above C7A.021

Also inherited, and the opposite of Excludes1: these conditions are not part of C7A.021, but a patient can have both, so you may code both.

Written on C7A — Malignant neuroendocrine tumors

malignant pancreatic islet cell tumors (C25.4)
Merkel cell carcinoma (C4A.-)

Other codes that can never be billed with C7A.021

These codes carry an Excludes1 note pointing at C7A.021. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C7A.021 alone.

C75Malignant neoplasm of other endocrine glands and related structures

Risk adjustment

C7A.021 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 21 Lymphoma and Other Cancers0.671 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

C7A.021 is named in 60 Medicare coverage policies — 60 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52479Oral Anticancer Drugs - Policy Article
A52479Oral Anticancer Drugs - Policy Article
A52480Oral Antiemetic Drugs (Replacement for Intravenous Antiemetics) - Policy Article
A52986Billing and Coding: Biomarkers for Oncology

How C7A.021 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 C7A.021.

Tumor›carcinoid›malignant›cecum

Code history

C7A.021 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share C7A.02. If C7A.021 is not quite right, the correct code is usually one of these.

Questions about C7A.021

Is C7A.021 a billable ICD-10-CM code?: Yes. C7A.021 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does C7A.021 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neuroendocrine tumors (C7A).