Free Medical Coding > ICD10 CM > 2024 ICD-10-CM Codes > 2024 ICD-10-CM Codes M00-M99 – Diseases of the musculoskeletal system and connective tissue (M00-M99) > 2024 ICD-10-CM Codes M15-M19 – Osteoarthritis (M15-M19) > 2024 ICD-10-CM Codes M18 – Osteoarthritis of first carpometacarpal joint (M18) > 2024 ICD-10-CM Codes M18.5 – Other unilateral secondary osteoarthritis of first carpometacarpal joint (M18.5)