Is C50 a billable ICD-10-CM code?

No. C50 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does C50 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neoplasms of breast (C50).

What cannot be coded together with C50?

C50 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

C50

C50 — Malignant neoplasm of breast

Non-billable headerICD-10-CM

C50 is a non-billable header ICD-10-CM code for malignant neoplasm of breast. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

skin of breast (C44.501, C44.511, C44.521, C44.591)

Use additional code

Add a secondary code to capture the detail described below.

code to identify estrogen, and other hormones and factors receptor status (Z17.-)

Includes

Conditions this code covers.

connective tissue of breast
Paget's disease of breast
Paget's disease of nipple

Other codes that can never be billed with C50

These codes carry an Excludes1 note pointing at C50. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C50 alone.

N61Inflammatory disorders of breast
D05Carcinoma in situ of breast
C49Malignant neoplasm of other connective and soft tissue
C49.3Malignant neoplasm of connective and soft tissue of thorax

Risk adjustment

C50 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 to one of these instead C50

10 child codes. Green means billable.

Questions about C50

Is C50 a billable ICD-10-CM code?: No. C50 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does C50 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neoplasms of breast (C50).
What cannot be coded together with C50?: C50 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.