715.96
716.9
ICD 9 code for total knee arthoplasty status post: V43.65
Without further information, probably the best ICD 9 code for seronegative arthritis would be 714.0, which is the code for rheumatoid arthritis.
716.9
81.54
719.46
80.9 knee arthroscopy
81.54 Total knee replacement
274.0 274.0
81.47
V43.65 aka knee replacement
996.4x