ICD-10-CM > M00-M99 > M00-M02 > M00 > M00.1 > M00.16 M00.16 Pneumococcal arthritis, knee Non-Billable/Non-Specific Codes M00.161Pneumococcal arthritis, right kneeM00.162Pneumococcal arthritis, left kneeM00.169Pneumococcal arthritis, unspecified knee