C43.51 Malignant melanoma of anal skin

The ICD-10-CM code for Malignant melanoma of anal skin is C43.51 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

C43-C44: Melanoma and other malignant neoplasms of skin (C43-C44)

Category C43

33 codes (24 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to C43.51:

• Melanoma (malignant) › skin › perineum
• Melanoma (malignant) › skin › anus, anal (skin)
• Melanoma (malignant) › skin › perianal skin

Inclusion Terms

• Malignant melanoma of anal margin
• Malignant melanoma of perianal skin

U.S. Hospital Utilization

• An estimated 130 U.S. inpatient stays in 2023 included C43.51 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary site .......................................................... 33

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference C43.51 with the canonical source and edition:

C43.51 — Malignant melanoma of anal skin. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/C43.51

Canonical URL: https://icd10codingpro.com/codes/C43.51