mechanical complication

Could anyone explain what the mechanical complication?
I can not distinguish ICD 996.4 family and 996.7 family because of not understanding mechanical complication.
When can I use 996.4 and when can I use 996.7?
please help.
Thanks in advance.

re: mechanical complication

[Could anyone explain what the mechanical complication?
I can not distinguish ICD 996.4 family and 996.7 family because of not understanding mechanical complication.
When can I use 996.4 and when can I use 996.7?
please help.
Thanks in advance.]
996.4 states "orthopedic device" 996.7 Is for other internal device. For example if you have a renal dialysis access complication you would use 996.73. For a prosthetic hip replacment dislocation you would use 996.42

re: mechanical complication

Thank you for reply, but 996.78 also has orthopedic device, implant, and graft.
then, what is the difference 996.78 and 996.4 family?
The meaning of "mechanical" does not matter to choose this code?
Please some more information.

re: mechanical complication

I interpret this 996.4 as meaning there is a Mechanical Complication of the implant not working properly or broken and 996.7 as meaning that due to the Mechanical Complication the patient now has an infection, stenosis, or something of that nature. Someone please correct me if I am wrong.