M20.032 Swan-neck deformity left finger(s) M20.039 Swan-neck deformity unspecified finger(s) M20.031 Swan-neck deformity right finger(s) Swan Neck Deformity ICD-9 736.22 Swan Neck Deformity 736.22 Swan Neck Deformity Etiology / Epidemiology / Natural History Characterized by hyperextension of the...