Fracture of base of skull, unspecified side, sequela

This code signifies a long-term complication or late effect resulting from a fracture to the base of the skull, where the specific side of the fracture was not documented. These sequelae can manifest months or years after the initial injury and may include conditions such as cranial nerve palsies, CSF leaks, or chronic headaches directly attributable to the original fracture.

Apply this code when documentation clearly indicates a current condition is a residual effect of a previously sustained, unspecified base of skull fracture. This is appropriate when the acute phase of the fracture has passed, and the patient is being treated for a persistent problem directly linked to that past injury. The medical record should explicitly state the link between the current condition and the prior skull base fracture.

• Always sequence this sequela code after the code for the specific condition or manifestation being treated (e.g., G51.0 for Bell's palsy due to the fracture).
• Ensure the documentation explicitly states "sequela of" or "due to prior" to support the use of the 7th character 'S'.
• Do not use this code for acute or active fractures; those require the appropriate 7th character for initial, subsequent, or malunion/nonunion encounters.