Oth bi secondary osteoarth of first carpometacarp joints

This code describes degenerative joint disease affecting both first carpometacarpal (CMC) joints, which are located at the base of the thumb. It indicates that the osteoarthritis is secondary, meaning it developed as a result of another underlying condition or injury, rather than being primary (idiopathic). This condition leads to pain, stiffness, and reduced function in both thumbs.

Use this code when documentation specifies bilateral secondary osteoarthritis of the first CMC joints. This diagnosis is typically supported by imaging studies (e.g., X-rays) showing characteristic degenerative changes and a documented underlying cause for the secondary nature. It is appropriate when the physician explicitly states "bilateral secondary osteoarthritis of the first carpometacarpal joints."

• Ensure documentation clearly specifies "secondary" osteoarthritis and not primary.
• Verify that both first carpometacarpal joints are affected; otherwise, a unilateral code or unspecified laterality code may be more appropriate.
• Code any underlying condition causing the secondary osteoarthritis first, if known and applicable, following ICD-10-CM sequencing guidelines.