ICD-10 Code C79.2 – Secondary malignant neoplasm of skin (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C79.2 – Secondary malignant neoplasm of skin
What it is
C79.2 identifies metastatic cancer that has spread to the skin from another primary site. Use it when the skin lesion is a secondary malignant deposit, not a primary skin cancer.
Clinical signs
Findings may include new skin nodules, plaques, or ulcerated lesions in a patient with known malignancy. Clinical features vary; refer to documentation and pathology when available.
When to use this code
Use C79.2 when the record clearly documents secondary malignant involvement of the skin, such as metastatic deposits confirmed by biopsy or specialist assessment. Code the primary cancer separately when it is still active or being managed. If the note only says “skin lesion” or “rash,” check documentation before assigning this code.
Do not use for
Do not use this code for primary skin cancers, benign skin lesions, or nonspecific dermatologic findings. Check documentation if the source of the lesion is unclear.
Coding tip
Verify that the chart states “metastatic,” “secondary,” or equivalent wording before you code C79.2.