Blister (nonthermal) of left ring finger, subs encntr

This code signifies a non-burn related blister located on the ring finger of the patient's left hand. This blister is not due to heat, cold, or chemical exposure, but rather from other causes such as friction or allergic reaction.

Apply this code when a patient presents for follow-up care, such as a dressing change or wound check, for a previously diagnosed nonthermal blister on their left ring finger. This indicates that the initial treatment has already been rendered and the patient is in a subsequent phase of care.

• Ensure the documentation clearly specifies a "nonthermal" etiology for the blister.
• Verify the laterality (left) and specific digit (ring finger) are accurately documented.
• Confirm that the encounter is for follow-up care, not the initial presentation, to justify the "D" seventh character.