Blister (nonthermal), left knee, subsequent encounter

This code indicates a non-burn related blister located on the left knee, which is being treated or evaluated after the initial encounter for the injury. This could be due to friction, pressure, or other mechanical forces, resulting in a fluid-filled lesion on the skin surface.

Apply this code when a patient presents for follow-up care, such as wound checks, dressing changes, or further evaluation of a blister on their left knee that was not caused by heat or cold. This is appropriate for subsequent visits after the initial diagnosis and treatment plan were established.

• Ensure documentation specifies "left knee" and "nonthermal" etiology.
• The 7th character "D" signifies a subsequent encounter, meaning the patient is receiving routine care during the healing phase.
• Always confirm the laterality (left vs. right) and the specific body part (knee) are clearly documented.