Stenosis due to nervous system prosth dev/grft, sequela

This code signifies a narrowing or stricture of a bodily passage or vessel that has developed as a long-term complication (sequela) of a previously implanted nervous system prosthetic device, implant, or graft. This stenosis is a direct result of the presence or function of the implanted material, rather than an acute event.

Use this code when documenting a patient presenting with symptoms or findings of stenosis, such as cerebrospinal fluid flow obstruction or nerve compression, that is directly attributable to a past neurosurgical implant (e.g., shunt, spinal cord stimulator, nerve graft). This code is appropriate for chronic or late-onset complications where the initial device insertion or acute complication has already been treated.

• Always assign this code as a secondary diagnosis, following the code for the specific type of stenosis (e.g., G91.0 for communicating hydrocephalus).
• Ensure documentation clearly links the stenosis to the previous nervous system device; this is a sequela code.
• Do not use for acute complications or mechanical failures of the device itself; those would fall under different T codes.