Blister (nonthermal) of oral cavity, subsequent encounter

This code signifies a non-thermal fluid-filled lesion within the oral cavity, such as a mucocutaneous blister or bulla, that is being treated or evaluated during a follow-up visit. It indicates that the initial injury or condition has already been assessed and this encounter is for ongoing management.

Use this code for follow-up encounters related to a blister in the mouth not caused by heat or cold, such as those resulting from trauma, irritation, or certain dermatological conditions. Documentation should clearly state "subsequent encounter" or indicate ongoing care for a previously diagnosed oral blister.

• Ensure the blister is explicitly documented as "nonthermal" and located within the oral cavity.
• Confirm the encounter type is for follow-up care, not the initial diagnosis or treatment.
• Differentiate from thermal burns (T28.0-T28.9) or blisters due to specific infections (e.g., herpes simplex).