Secondary osteoarthritis, left hand

This code signifies degenerative joint disease affecting the left hand, arising as a consequence of another underlying condition such as trauma, inflammatory arthritis, or metabolic disorders. It indicates that the osteoarthritis is not primary (idiopathic) but rather secondary to an identifiable cause.

Apply this code when documentation explicitly states "secondary osteoarthritis of the left hand" or when osteoarthritis of the left hand is clearly linked to a pre-existing condition. Supporting documentation should identify the primary cause leading to the secondary osteoarthritis.

• Always sequence the underlying cause of the secondary osteoarthritis first, if known and actively treated.
• Distinguish carefully from primary osteoarthritis (M19.042) where no specific underlying cause is identified.
• Ensure laterality is accurately documented and coded; this code specifies the left hand.