Blister (nonthermal) of unspecified upper arm, init encntr

This code signifies a non-burn related fluid-filled lesion on the upper arm, where the specific side (left or right) is not documented. It indicates the first time a patient is receiving active treatment for this particular injury.

Apply this code when a patient presents with a blister on their upper arm that is not caused by heat, cold, or chemicals, and the medical record does not specify which arm is affected. This is appropriate for the initial visit for evaluation and management of the blister.

• Ensure documentation explicitly states the blister is non-thermal and the upper arm is the affected site.
• Only use this code when the laterality (left or right) is truly unspecified in the medical record.
• The "A" seventh character indicates an initial encounter for active treatment.