Is C79.1 a billable ICD-10-CM code?

No. C79.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does C79.1 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80).

What cannot be coded together with C79.1?

C79.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above C79.1 (C79) and apply to it just the same.

C79.1

C79.1 — Secondary malignant neoplasm of bladder and other and unspecified urinary organs

Non-billable headerICD-10-CM

C79.1 is a non-billable header ICD-10-CM code for secondary malignant neoplasm of bladder and other and unspecified urinary organs. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above C79.1

These are not written on C79.1, but they bind it: a note on a category applies to every code beneath it. Billing C79.1 with anything listed here is a denial.

Written on C79 — Secondary malignant neoplasm of other and unspecified sites

secondary carcinoid tumors (C7B.-)
secondary neuroendocrine tumors (C7B.-)

Risk adjustment

C79.1 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code history

C79.1 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead C79.1

3 child codes. Green means billable.

Related codes at this level

Codes that share C79. If C79.1 is not quite right, the correct code is usually one of these.

Questions about C79.1

Is C79.1 a billable ICD-10-CM code?: No. C79.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does C79.1 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80).
What cannot be coded together with C79.1?: C79.1 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above C79.1 (C79) and apply to it just the same.