Blister (nonthermal) of scalp, subsequent encounter

This code describes a non-thermal blister located on the scalp that is being treated or evaluated during a follow-up visit. A non-thermal blister is typically caused by friction, pressure, or a chemical irritant, as opposed to heat or cold.

Assign this code for subsequent encounters when a patient presents for ongoing management, healing assessment, or treatment of a previously diagnosed non-thermal blister of the scalp. Documentation should clearly indicate the blister's non-thermal etiology and the visit's purpose as follow-up care.

• Ensure documentation specifies "non-thermal" to differentiate from burn blisters.
• Confirm the encounter type is "subsequent" (D) and not initial (A) or sequela (S).
• Verify the anatomical site is specifically the scalp; other head regions have different codes.