ICD-10 Code C44.609 – Unspecified malignant neoplasm of skin of left upper limb, including shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.609 – Unspecified malignant neoplasm of skin of left upper limb, including shoulder
What it is
This code identifies a malignant skin neoplasm on the left upper limb, including the shoulder, when the exact histology or site detail is not documented. Use it when the record confirms skin cancer but does not specify a more precise diagnosis.
Clinical signs
Findings may include a suspicious skin lesion, nonhealing sore, changing mole, or an irregular, enlarging mass on the left arm or shoulder. Clinical features vary; refer to documentation.
When to use this code
Use C44.609 when the provider documents a malignant neoplasm of skin in the left upper limb or shoulder and does not identify a more specific type or subsite. It also applies when pathology or assessment confirms malignancy, but the note remains nonspecific. Check documentation if laterality or anatomic detail is unclear.
Do not use for
Do not use this code for benign skin lesions, dysplastic nevi, or nonmalignant tumors. Also avoid it when the record supports a more specific skin cancer code or a different body site.
Coding tip
If pathology, operative notes, or the final assessment provide a more specific diagnosis, code that instead of an unspecified malignant neoplasm.