Comparison of implant related complications amongst patients with opioid use disorder and non-users following total knee arthroplasty

Table 1 List of ICD-9 procedure and complication codes used

ICD-9 code	Procedure and/or complication
81.54	Total knee arthroplasty
81.55; 00.80-00.84	Total knee arthroplasty revision
305.50-305.52	Opioid abuse
304.00-304.02	Opioid dependency
996.41	Mechanical loosening of prosthetic joint
996.42	Dislocation of prosthetic joint
996.43	Broken prosthetic joint implant
996.44	Peri-prosthetic fracture around prosthetic joint
996.47	Other mechanical complication of prosthetic joint implant
996.49	Other mechanical complication of other internal orthopedic device, implant, and graft
996.77	Other complications due to internal joint prosthesis
730, 996.66, 996.67, 996.69, 998.13, 998.30–998.32, 998.51, 998.59	Infection and wound