Blister (nonthermal) of left shoulder, initial encounter

This code describes a non-burn related fluid-filled lesion on the skin of the patient's left shoulder. Such blisters can result from various causes, including friction, allergic reactions, or certain skin conditions, but specifically exclude those caused by heat or cold.

Apply this code when documenting the initial treatment or evaluation of a patient presenting with a blister on their left shoulder that is not due to a thermal injury. This is appropriate for conditions like contact dermatitis causing blistering, friction blisters from clothing or equipment, or blisters from insect bites on the specified anatomical site.

• Ensure the documentation clearly specifies "left shoulder" and confirms the blister is non-thermal in origin.
• Verify this is the patient's first encounter for this specific injury; subsequent encounters will require a different seventh character.
• Look for additional codes to identify the underlying cause of the blister, if known (e.g., contact dermatitis, insect bite).