ICD-10-CM > M00-M99 > M15-M19 > M18 > M18.3 M18.3 Unilateral post-traumatic osteoarthritis of first carpometacarpal joint Non-Billable/Non-Specific Applicable To Post-traumatic osteoarthritis of first carpometacarpal joint NOS Codes M18.30Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified handM18.31Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right handM18.32Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand