ICD-10 Code C43.6 – Malignant melanoma of upper limb, including shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C43.6 – Malignant melanoma of upper limb, including shoulder
What it is
C43.6 identifies a malignant melanoma located on the upper limb, including the shoulder. Use it when the documentation specifies melanoma in that anatomic site and does not indicate a more specific subsite.
Clinical signs
Typical findings include an irregular pigmented skin lesion that may change in size, shape, color, or border. Clinical features vary; refer to documentation and pathology confirmation when available.
When to use this code
Use C43.6 when the provider documents malignant melanoma of the arm, forearm, hand, or shoulder, without a more precise site code. It also fits when pathology confirms melanoma in that region and the note supports the diagnosis. If the record only says “melanoma” with no site, check documentation.
Do not use for
Do not use this code for benign nevi, melanoma in situ, or other skin cancers. Do not assign it when the lesion is documented on a different body site.
Coding tip
Verify the exact anatomic location in the operative note, pathology report, or assessment before assigning C43.6.