C44.520 – Squamous cell carcinoma of anal skin

ICD-10-CM 2027 diagnosis code · Melanoma and other malignant neoplasms of skin

Billable code

ICD-10-CM code C44.520

Code: C44.520 (claims format: C44520)
Description: Squamous cell carcinoma of anal skin
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 2. Neoplasms (C00-D49)
Block: C43-C44 Melanoma and other malignant neoplasms of skin
Parent codes: C44 › C44.5 › C44.52

Notes for C44.520

Applicable to:

Squamous cell carcinoma of anal margin
Squamous cell carcinoma of perianal skin

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

C44 – Other and unspecified malignant neoplasm of skin

Includes:

malignant neoplasm of sebaceous glands
malignant neoplasm of sweat glands

Excludes1 (not coded here):

Kaposi's sarcoma of skin (C46.0)
malignant melanoma of skin (C43.-)
malignant neoplasm of skin of genital organs (C51-C52, C60.-, C63.2)
Merkel cell carcinoma (C4A.-)

C44.5 – Other and unspecified malignant neoplasm of skin of trunk

Excludes1 (not coded here):

anus NOS (C21.0)
scrotum (C63.2)

Related codes in C44.52

Frequently asked questions

What is ICD-10 code C44.520?

C44.520 is the ICD-10-CM code for squamous cell carcinoma of anal skin, in the block C43-C44 (Melanoma and other malignant neoplasms of skin).

Is C44.520 a billable code?

Yes. C44.520 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does C44.520 belong to?

It belongs to category C44 – Other and unspecified malignant neoplasm of skin.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.