Is C44.521 a billable ICD-10 code?

Yes. C44.521 (Squamous cell carcinoma of skin of breast) is billable and can be used for insurance claims. Always verify payer-specific requirements.

C44.521 ✓ Billable

Squamous cell carcinoma of skin of breast

Q: What is ICD-10 code C44.521?

ICD-10-CM code C44.521 stands for "Squamous cell carcinoma of skin of breast". It is a billable code in the Neoplasms chapter, effective FY2026 (Oct 1, 2025 – Sep 30, 2026).

ICD-10-CM · FY2026 · Neoplasms

Code

C44.521

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 C44.521?

ICD-10-CM code C44.521 represents Squamous cell carcinoma of skin of breast. It is a billable diagnosis code in the Neoplasms chapter, effective October 1, 2025 – September 30, 2026.

Is C44.521 billable?

Yes. C44.521 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.

What chapter is C44.521 in?

C44.521 belongs to the Neoplasms chapter (C00–D49) of ICD-10-CM.

Related codes in the C44 category

C44 Other and unspecified malignant neoplasm of skin Non-billable C44.0 Other and unspecified malignant neoplasm of skin of lip Non-billable C44.1 Other and unspecified malignant neoplasm of skin of eyelid, including canthus Non-billable C44.2 Other and unspecified malignant neoplasm of skin of ear and external auricular canal Non-billable C44.00 Unspecified malignant neoplasm of skin of lip Billable C44.01 Basal cell carcinoma of skin of lip Billable C44.02 Squamous cell carcinoma of skin of lip Billable C44.09 Other specified malignant neoplasm of skin of lip Billable

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