Blister (nonthermal) of lip, subsequent encounter

This code indicates a non-thermal blister located on the lip that is being addressed during a follow-up visit. This could result from friction, irritation, or other non-burn related causes, presenting as a fluid-filled lesion on the labial mucosa or vermilion border.

Apply this code for encounters where a patient is returning for evaluation or treatment of a previously diagnosed non-thermal lip blister. Documentation should clearly state "subsequent encounter" or indicate ongoing management of the condition, such as wound care, monitoring for healing, or follow-up after initial treatment.

• Ensure the documentation specifies "non-thermal" to differentiate from burn blisters.
• Verify the encounter type is subsequent; use the initial encounter code for the first presentation.
• Confirm the blister is specifically on the lip, not other oral or facial areas.