ICD-10-CM > M00-M99 > M20-M25 > M20 > M20.0 M20.0 Deformity of finger(s) Non-Billable/Non-Specific Type 1 Excludes clubbing of fingers (R68.3)palmar fascial fibromatosis [Dupuytren] (M72.0)trigger finger (M65.3) Codes M20.00Unspecified deformity of finger(s)M20.001Unspecified deformity of right finger(s)M20.002Unspecified deformity of left finger(s)M20.009Unspecified deformity of unspecified finger(s)M20.01Mallet fingerM20.011Mallet finger of right finger(s)M20.012Mallet finger of left finger(s)M20.019Mallet finger of unspecified finger(s)M20.02Boutonnière deformityM20.021Boutonnière deformity of right finger(s)M20.022Boutonnière deformity of left finger(s)M20.029Boutonnière deformity of unspecified finger(s)M20.03Swan-neck deformityM20.031Swan-neck deformity of right finger(s)M20.032Swan-neck deformity of left finger(s)M20.039Swan-neck deformity of unspecified finger(s)M20.09Other deformity of finger(s)M20.091Other deformity of right finger(s)M20.092Other deformity of left finger(s)M20.099Other deformity of finger(s), unspecified finger(s)