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

This code describes the long-term effects (sequela) of a primary blast injury to the brain, where the initial injury involved a loss of consciousness of unknown duration. It signifies a brain injury directly caused by the overpressure wave of an explosion, with residual symptoms or conditions present after the acute phase.

Use this code when documenting a patient presenting with chronic neurological deficits or other lasting complications directly attributable to a primary blast-induced brain injury. The patient's history must clearly indicate a primary blast exposure and an initial loss of consciousness, with the current encounter addressing the ongoing sequelae.

• This code is for sequelae; an additional code for the specific residual condition (e.g., cognitive deficit, epilepsy) should also be reported.
• Ensure documentation specifies "primary blast injury" and not secondary or tertiary blast mechanisms.
• Verify that the loss of consciousness duration was truly "unspecified" in the original injury documentation; otherwise, a more specific code may apply.