C44.521 — Squamous cell carcinoma of skin of breast
C44.521 is a billable, specific ICD-10-CM code for squamous cell carcinoma of skin of breast. It is valid for submission on a claim.
Other codes that can never be billed with C44.521
These codes carry an Excludes1 note pointing at C44.521. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C44.521 alone.
- C50Malignant neoplasm of breast
Risk adjustment
C44.521 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.
Medicare coverage
C44.521 is named in 81 Medicare coverage policies — 77 listing it as supporting medical necessity, and 4 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A59380Billing and Coding: MolDX: Molecular Biomarker Testing for Risk Stratification of Cutaneous Squamous Cell Carcinomanot covered
- A59382Billing and Coding: MolDX: Molecular Biomarker Testing for Risk Stratification of Cutaneous Squamous Cell Carcinomanot covered
- A59386Billing and Coding: MolDX: Molecular Biomarker Testing for Risk Stratification of Cutaneous Squamous Cell Carcinomanot covered
- A59429Billing and Coding: MolDX: Molecular Biomarker Testing for Risk Stratification of Cutaneous Squamous Cell Carcinomanot covered
Related codes at this level
Codes that share C44.52. If C44.521 is not quite right, the correct code is usually one of these.
Questions about C44.521
- Is C44.521 a billable ICD-10-CM code?
- Yes. C44.521 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does C44.521 sit in the tabular list?
- Neoplasms (C00-D49), in the block Melanoma and other malignant neoplasms of skin (C43-C44).