Injury of thoracic sympathetic nervous system, sequela

This code signifies a long-term or late-developing complication resulting from a past injury to the sympathetic nerves located in the thoracic region of the spine. These nerves control involuntary bodily functions, and their injury can lead to persistent issues like chronic pain, altered sweating, or circulatory problems in the affected areas. The "sequela" indicates that the initial acute injury has resolved, but its lasting effects are still present.

Use this code when documenting conditions such as persistent Horner's syndrome, chronic neuropathic pain, or complex regional pain syndrome (CRPS) that are directly attributable to a previous trauma to the thoracic sympathetic chain. This applies when the original injury event is no longer acute, and the patient is being treated for the residual effects.

• Always link this sequela code to an external cause code (V00-Y99) to specify the original injury event, if known.
• Ensure documentation clearly states the connection between the current condition and a past injury to the thoracic sympathetic nervous system.
• Do not use this code for acute injuries; instead, use the appropriate acute injury code from the S24 category.