Primary blast injury of lung, bilateral, sequela

This code signifies long-term complications or residual effects stemming from a primary blast injury affecting both lungs. These sequelae can include persistent respiratory dysfunction, chronic inflammation, fibrosis, or other lasting structural damage to the pulmonary system directly attributable to the initial blast force.

Apply this code when documenting a patient's current condition that is a direct consequence of a primary blast injury to both lungs, and the acute phase of the injury has passed. This is appropriate for follow-up encounters or when managing chronic issues arising from such an event.

• Requires a seventh character "S" to indicate sequela, meaning the residual effect of a past injury.
• Do not use for acute blast injuries; those would be coded with the appropriate acute injury codes.
• Always code the specific manifestation of the sequela (e.g., chronic respiratory failure, pulmonary fibrosis) in addition to this sequela code.