ICD-10-CM > M00-M99 > M20-M25 > M20 > M20.0 > M20.03 M20.03 Swan-neck deformity Non-Billable/Non-Specific Codes M20.031Swan-neck deformity of right finger(s)M20.032Swan-neck deformity of left finger(s)M20.039Swan-neck deformity of unspecified finger(s)