Inj extensor musc/fasc/tend left thumb at wrs/hnd lv, init

This code signifies an injury to the extensor muscles, fascia, or tendons of the left thumb, specifically occurring at the wrist or hand level. This injury is not a sprain, strain, or laceration, but rather another specified type of damage to these structures.

Use this code for initial encounters when a patient presents with a documented injury to the ext extensor mechanism of the left thumb at the wrist or hand, and the injury type is described as something other than a sprain, strain, or open wound. Examples include crush injuries, avulsions, or other specified traumatic disruptions of these tissues.

• Ensure documentation clearly specifies the left thumb and the injury location at the wrist or hand level.
• Verify that the injury type is "other specified" and not a simple sprain/strain (S66.21-S66.22-) or laceration (S66.20-).
• Confirm this is the patient's initial encounter for this specific injury.