Ca in situ skin of right upper limb, including shoulder

This code signifies the presence of non-invasive malignant cells confined to the epidermis (carcinoma in situ) on the skin of a patient's right upper extremity, encompassing the shoulder region. This condition represents the earliest stage of squamous cell carcinoma or melanoma, where the abnormal cells have not yet invaded deeper tissues.

Apply this code when documentation confirms a diagnosis of carcinoma in situ affecting the skin of the right arm, forearm, hand, or shoulder. Supporting documentation typically includes pathology reports confirming in situ malignancy and physician notes specifying the anatomical location on the right upper limb.

• Ensure the pathology report explicitly states "in situ" and not invasive carcinoma.
• Verify laterality (right upper limb) is clearly documented; do not use for unspecified or left-sided lesions.
• Distinguish from benign skin lesions or other malignant skin neoplasms that are invasive.