ICD-10 Code C44.621 – Squamous cell carcinoma of skin of unspecified upper limb, including shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C44.621 – Squamous cell carcinoma of skin of unspecified upper limb, including shoulder
What it is
This code identifies a squamous cell carcinoma arising in the skin of an unspecified upper limb, including the shoulder. Use it when the record confirms the site but does not specify right or left.
Clinical signs
Typical findings include a persistent scaly or crusted skin lesion, a nonhealing ulcer, or a firm enlarging nodule. Clinical features vary; refer to documentation.
When to use this code
Use C44.621 when the provider documents squamous cell carcinoma of the skin on an upper limb or shoulder and laterality is not stated. It also fits pathology-confirmed cases with an unspecified side in the final diagnosis. If the note localizes the lesion to a different body site, do not assign this code.
Do not use for
Do not use this code for basal cell carcinoma, melanoma, or SCC at a different anatomic site. Check documentation if the lesion is described as deeper than skin or if laterality is clearly stated.
Coding tip
Look for exact site wording and laterality in the assessment, pathology, or operative note before assigning this code.