ICD-10-CM M20: Acquired deformities of fingers and toes

ICD-10-CM Diagnosis Code (2025)

Official Description for M20

Acquired deformities of fingers and toes

Coding Notes & Guidelines for M20

Excludes1: Not Coded Here
  • acquired absence of fingers and toes (Z89.-)
  • congenital absence of fingers and toes (Q71.3-, Q72.3-)
  • congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)
Excludes1: Not Coded Here
  • clubbing of fingers (R68.3)
  • palmar fascial fibromatosis [Dupuytren] (M72.0)
  • trigger finger (M65.3)
Excludes2: Not Included Here

bunion (M21.6-)

Child Codes (More Specific Codes for M20):

M20.0 - Deformity of finger(s) M20.00 - Unspecified deformity of finger(s) M20.001 - Unspecified deformity of right finger(s) M20.002 - Unspecified deformity of left finger(s) M20.009 - Unspecified deformity of unspecified finger(s) M20.01 - Mallet finger M20.011 - Mallet finger of right finger(s) M20.012 - Mallet finger of left finger(s) M20.019 - Mallet finger of unspecified finger(s) M20.02 - Boutonnière deformity M20.021 - Boutonnière deformity of right finger(s) M20.022 - Boutonnière deformity of left finger(s) M20.029 - Boutonnière deformity of unspecified finger(s) M20.03 - Swan-neck deformity M20.031 - Swan-neck deformity of right finger(s) M20.032 - Swan-neck deformity of left finger(s) M20.039 - Swan-neck deformity of unspecified finger(s) M20.09 - Other deformity of finger(s) M20.091 - Other deformity of right finger(s) M20.092 - Other deformity of left finger(s) M20.099 - Other deformity of finger(s), unspecified finger(s) M20.1 - Hallux valgus (acquired) M20.10 - Hallux valgus (acquired), unspecified foot M20.11 - Hallux valgus (acquired), right foot M20.12 - Hallux valgus (acquired), left foot M20.2 - Hallux rigidus M20.20 - Hallux rigidus, unspecified foot M20.21 - Hallux rigidus, right foot M20.22 - Hallux rigidus, left foot M20.3 - Hallux varus (acquired) M20.30 - Hallux varus (acquired), unspecified foot M20.31 - Hallux varus (acquired), right foot M20.32 - Hallux varus (acquired), left foot M20.4 - Other hammer toe(s) (acquired) M20.40 - Other hammer toe(s) (acquired), unspecified foot M20.41 - Other hammer toe(s) (acquired), right foot M20.42 - Other hammer toe(s) (acquired), left foot M20.5 - Other deformities of toe(s) (acquired) M20.5X - Other deformities of toe(s) (acquired) M20.5X1 - Other deformities of toe(s) (acquired), right foot M20.5X2 - Other deformities of toe(s) (acquired), left foot M20.5X9 - Other deformities of toe(s) (acquired), unspecified foot M20.6 - Acquired deformities of toe(s), unspecified M20.60 - Acquired deformities of toe(s), unspecified, unspecified foot M20.61 - Acquired deformities of toe(s), unspecified, right foot M20.62 - Acquired deformities of toe(s), unspecified, left foot

About ICD-10-CM Code M20 (Acquired deformities of fingers and toes)

ICD-10-CM code M20 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM M20 became effective on October 1, 2024.

This page provides detailed information about M20 - Acquired deformities of fingers and toes. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Acquired deformities of fingers and toes.