ⅩⅢ.Diseases of the musculoskeletal system and connective tissue (M00-M99)M00-M03.Infectious arthropathiesM00.Pyogenic arthritisM00.0.Staphylococcal arthritis and polyarthritisM00.1.Pneumococcal arthritis and polyarthritisM00.2.Other streptococcal arthritis and polyarthritisM00.8.Arthritis and polyarthritis due to other specified bacterial agentsM00.9.Pyogenic arthritis, unspecifiedM01.Direct inf..