Primary blast inj brain, NEC LOC status unknown, sequela

This code signifies a brain injury resulting directly from the overpressure wave of an explosion, where the patient's level of consciousness immediately following the injury is not documented. It specifically refers to the long-term effects or complications arising from such an injury, rather than the acute event.

Apply this code when documenting the sequelae of a primary blast brain injury where the initial loss of consciousness status was not recorded. This is appropriate for follow-up encounters addressing chronic neurological deficits, cognitive impairments, or other lasting consequences directly attributable to the original blast trauma.

• Only use for the sequela (late effects) of the injury, not the initial acute injury.
• Ensure documentation explicitly states "primary blast injury" and that the loss of consciousness status is unknown or unspecified.
• Always sequence this code after the primary diagnosis describing the specific sequela being treated (e.g., cognitive deficit, chronic headache).