ICD-10-CM > M00-M99 > M15-M19 > M19 > M19.9 M19.9 Osteoarthritis, unspecified site Non-Billable/Non-Specific Codes M19.90Unspecified osteoarthritis, unspecified siteM19.91Primary osteoarthritis, unspecified siteM19.92Post-traumatic osteoarthritis, unspecified siteM19.93Secondary osteoarthritis, unspecified site