Distal interphalangeal psoriatic arthropathy

This code identifies a specific form of psoriatic arthritis affecting the distal interphalangeal (DIP) joints of the hands or feet. It is characterized by inflammation, pain, and swelling in these joints, often accompanied by nail changes typical of psoriasis. This condition is a seronegative spondyloarthropathy linked to psoriasis.

Apply this code when documentation clearly indicates psoriatic arthritis localized to the DIP joints. Supporting clinical findings include DIP joint tenderness, swelling, dactylitis, and psoriatic nail involvement. This code is appropriate for both initial diagnoses and exacerbations of existing DIP psoriatic arthropathy.

• Ensure documentation specifies "distal interphalangeal" to differentiate from other psoriatic arthropathy presentations.
• Code the underlying psoriasis (L40.0-L40.9) as a primary diagnosis if it is the reason for the encounter, or as an additional diagnosis.
• Do not confuse with other forms of inflammatory arthritis affecting DIP joints, such as osteoarthritis or rheumatoid arthritis (which rarely affects DIPs).