Unil primary osteoarth of first carpometacarp joint, r hand

This code identifies a degenerative joint disease affecting the base of the right thumb, specifically the joint between the first metacarpal bone and the trapezium bone. It signifies that the osteoarthritis is primary (idiopathic) and affects only one side.

Apply this code for patients diagnosed with osteoarthritis localized to the first carpometacarpal joint of the right hand, without a known secondary cause. Documentation should clearly state "primary osteoarthritis," "unilateral," and specify "right hand" and "first carpometacarpal joint."

• Ensure documentation specifies "primary" osteoarthritis; differentiate from secondary forms.
• Verify laterality (right hand) and the specific joint (first carpometacarpal) are clearly documented.
• Do not use this code if the osteoarthritis affects both hands or is generalized.