| M18 | Osteoarthritis of first carpometacarpal joint |
| M180 | Bilateral primary osteoarthritis of first carpometacarpal joints |
| M181 | Unilateral primary osteoarthritis of first carpometacarpal joint |
| M1810 | Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand |
| M1811 | Unilateral primary osteoarthritis of first carpometacarpal joint, right hand |
| M1812 | Unilateral primary osteoarthritis of first carpometacarpal joint, left hand |
| M182 | Bilateral post-traumatic osteoarthritis of first carpometacarpal joints |
| M183 | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint |
| M1830 | Unil post-trauma osteoarth of 1st carpometacarp jt,unsp hand Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand |
| M1831 | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand |
| M1832 | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand |
| M184 | Other bilateral secondary osteoarthritis of first carpometacarpal joints |
| M185 | Other unilateral secondary osteoarthritis of first carpometacarpal joint |
| M1850 | Oth unil sec osteoarth of 1st carpometacarp joint, unsp hand Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand |
| M1851 | Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand |
| M1852 | Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand |
| M189 | Osteoarthritis of first carpometacarpal joint, unspecified |
| M19 | Other and unspecified osteoarthritis |
| M190 | Primary osteoarthritis of other joints |
| M1901 | Primary osteoarthritis, shoulder |
| M19011 | Primary osteoarthritis, right shoulder |
| M19012 | Primary osteoarthritis, left shoulder |
| M19019 | Primary osteoarthritis, unspecified shoulder |
| M1902 | Primary osteoarthritis, elbow |
| M19021 | Primary osteoarthritis, right elbow |
| M19022 | Primary osteoarthritis, left elbow |
| M19029 | Primary osteoarthritis, unspecified elbow |
| M1903 | Primary osteoarthritis, wrist |
| M19031 | Primary osteoarthritis, right wrist |
| M19032 | Primary osteoarthritis, left wrist |
| M19039 | Primary osteoarthritis, unspecified wrist |
| M1904 | Primary osteoarthritis, hand |
| M19041 | Primary osteoarthritis, right hand |
| M19042 | Primary osteoarthritis, left hand |
| M19049 | Primary osteoarthritis, unspecified hand |
| M1907 | Primary osteoarthritis ankle and foot |
| M19071 | Primary osteoarthritis, right ankle and foot |
| M19072 | Primary osteoarthritis, left ankle and foot |
| M19079 | Primary osteoarthritis, unspecified ankle and foot |
| M1909 | Primary osteoarthritis, other specified site |
| M191 | Post-traumatic osteoarthritis of other joints |
| M1911 | Post-traumatic osteoarthritis, shoulder |
| M19111 | Post-traumatic osteoarthritis, right shoulder |
| M19112 | Post-traumatic osteoarthritis, left shoulder |
| M19119 | Post-traumatic osteoarthritis, unspecified shoulder |
| M1912 | Post-traumatic osteoarthritis, elbow |
| M19121 | Post-traumatic osteoarthritis, right elbow |
| M19122 | Post-traumatic osteoarthritis, left elbow |
| M19129 | Post-traumatic osteoarthritis, unspecified elbow |
| M1913 | Post-traumatic osteoarthritis, wrist |