ICD-10-CM > M00-M99 > M15-M19 > M17 > M17.1 M17.1 Unilateral primary osteoarthritis of knee Non-Billable/Non-Specific Applicable To Primary osteoarthritis of knee NOS Codes M17.10Unilateral primary osteoarthritis, unspecified kneeM17.11Unilateral primary osteoarthritis, right kneeM17.12Unilateral primary osteoarthritis, left knee