Primary blast inj brain, NEC LOC of unsp duration, subs

This code signifies a brain injury resulting from the direct impact of a blast wave, not categorized under more specific blast-related brain trauma. The patient experienced a loss of consciousness for an unknown duration at the time of the injury. This code is used for follow-up care after the initial treatment of the injury.

Apply this code for subsequent encounters when a patient is receiving ongoing care for a primary blast-induced brain injury that doesn't fit other specific blast injury codes. Documentation should clearly state the injury mechanism as a blast, confirm a history of associated loss of consciousness of unspecified duration, and indicate that this is not the initial treatment visit.

• Ensure documentation specifies "primary blast injury" and not secondary, tertiary, or quaternary blast effects.
• Verify the encounter is for follow-up care; use an acute encounter code for the initial treatment.
• Do not use if the duration of loss of consciousness is known or if the injury is specifically described as diffuse axonal injury or another specified blast-related brain injury.