C43.51 – Malignant melanoma of anal skin

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

Billable code

ICD-10-CM code C43.51

Code: C43.51 (claims format: C4351)
Description: Malignant melanoma 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: C43 › C43.5

Notes for C43.51

Applicable to:

Malignant melanoma of anal margin
Malignant melanoma of perianal skin

Notes inherited from parent codes

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

C43 – Malignant melanoma of skin

Excludes1 (not coded here):

melanoma in situ (D03.-)

Excludes2 (not included here):

malignant melanoma of skin of genital organs (C51-C52, C60.-, C63.-)
Merkel cell carcinoma (C4A.-)
sites other than skin-code to malignant neoplasm of the site

C43.5 – Malignant melanoma of trunk

Excludes2 (not included here):

malignant neoplasm of anus NOS (C21.0)
malignant neoplasm of scrotum (C63.2)

Index terms for C43.51

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in C43.5

Frequently asked questions

What is ICD-10 code C43.51?

C43.51 is the ICD-10-CM code for malignant melanoma of anal skin, in the block C43-C44 (Melanoma and other malignant neoplasms of skin).

Is C43.51 a billable code?

Yes. C43.51 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does C43.51 belong to?

It belongs to category C43 – Malignant melanoma 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.