Blister (nonthermal) of right ring finger, initial encounter

This code signifies a non-heat-related fluid-filled lesion on the fourth digit of the right hand. It indicates the initial presentation or active treatment phase of such an injury, distinguishing it from subsequent care.

Apply this code for patients presenting with a blister on their right ring finger that is not caused by burns or frostbite. This includes blisters resulting from friction, pressure, or contact with irritants, during the period of active treatment.

• Ensure the blister etiology is explicitly documented as nonthermal.
• Verify the laterality and specific digit (ring finger) are clearly stated in the medical record.
• Confirm this is the first encounter for this specific injury to justify the "A" seventh character.