ICD-10-CM > M00-M99 > M20-M25 > M20 > M20.0 > M20.02 M20.02 Boutonnière deformity Non-Billable/Non-Specific Codes M20.021Boutonnière deformity of right finger(s)M20.022Boutonnière deformity of left finger(s)M20.029Boutonnière deformity of unspecified finger(s)