Inj extn/abdr musc/fasc/tend of l thm at forarm lv, sequela

This code signifies a long-term effect or complication resulting from a previous injury to the extensor or abductor muscles, fascia, or tendons of the left thumb, specifically where these structures are located at the forearm level. This indicates that the initial acute injury has resolved, but the patient continues to experience residual symptoms or conditions directly attributable to that past trauma.

This code is appropriate for documenting chronic pain, weakness, limited range of motion, or other persistent functional deficits in the left thumb and forearm that are a direct consequence of an old injury to its extensor or abductor musculotendinous units. It should be used when the initial acute injury is no longer present, but its lasting impact requires ongoing medical attention or management.

• Ensure documentation clearly links the current sequela to a previously sustained injury of the specified muscle groups.
• This code requires a seventh character 'S' for sequela, indicating the long-term nature of the condition.
• Do not use for acute injuries; instead, select an appropriate acute injury code from the S56.392 range.