Oth injury of unsp innominate or subclavian artery, sequela

This code signifies a long-term complication or late effect resulting from a previously sustained, non-specific injury to an unspecified innominate (brachiocephalic) or subclavian artery. The initial injury is no longer acute, and the patient is experiencing ongoing issues directly attributable to that past trauma.

Apply this code when documenting a sequela, such as chronic arterial stenosis, pseudoaneurysm, or persistent dissection, that developed after an injury to the innominate or subclavian artery. This is appropriate when the original injury event is in the past and the current encounter addresses the residual effects.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela (e.g., I70.8 for atherosclerosis of other arteries).
• Ensure documentation clearly links the current condition to a past injury of the innominate or subclavian artery.
• The "S" seventh character indicates sequela and should only be used for complications or conditions arising as a direct result of a previous injury, after the acute phase has passed.