Boutonniere deformity of left finger(s)

📋Clinical Description

This diagnosis code signifies a specific hand deformity affecting the left finger(s) where the middle joint (proximal interphalangeal or PIP joint) is bent (flexed) and the end joint (distal interphalangeal or DIP joint) is hyperextended. This condition results from disruption of the central slip of the extensor tendon.

🎯When to Use

Use this code when documentation clearly indicates a boutonniere deformity affecting one or more fingers on the patient's left hand. This typically occurs due to trauma, inflammatory arthritis (e.g., rheumatoid arthritis), or chronic overuse. Supporting documentation should specify the affected side and the characteristic PIP flexion and DIP hyperextension.

💡Coding Tips

Ensure laterality is explicitly documented as "left" to support this specific code.
Distinguish from swan neck deformity, which presents with PIP hyperextension and DIP flexion.
Code any underlying cause, such as rheumatoid arthritis (M05.-, M06.-), in addition to the deformity.

AI-generated reference — verify against official guidelines

Code Hierarchy

▲M20.02Boutonniere deformity

M20.022(current)

Crosswalks

736.21ApproxICD-9

Same Category

M20Acquired deformities of fingers and toes M20.0Deformity of finger(s)M20.00Unspecified deformity of finger(s)M20.001Unspecified deformity of right finger(s)M20.002Unspecified deformity of left finger(s)