ICD-10-CM > M00-M99 > M20-M25 > M20 > M20.0 > M20.01 M20.01 Mallet finger Non-Billable/Non-Specific Codes M20.011Mallet finger of right finger(s)M20.012Mallet finger of left finger(s)M20.019Mallet finger of unspecified finger(s)