M20.012 – Mallet finger of left finger(s)

ICD-10-CM 2027 diagnosis code · Other joint disorders

Billable code

ICD-10-CM code M20.012

Code: M20.012 (claims format: M20012)
Description: Mallet finger of left finger(s)
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M20-M25 Other joint disorders
Parent codes: M20 › M20.0 › M20.01

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M20 – Acquired deformities of fingers and toes

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.-)

M20.0 – Deformity of finger(s)

Excludes1 (not coded here):

clubbing of fingers (R68.3)
palmar fascial fibromatosis [Dupuytren] (M72.0)
trigger finger (M65.3)

Block M20-M25

Excludes2 (not included here):

joints of the spine (M40-M54)

Related codes in M20.01

M20.011 – Mallet finger of right finger(s)Billable
M20.019 – Mallet finger of unspecified finger(s)Billable

Frequently asked questions

What is ICD-10 code M20.012?

M20.012 is the ICD-10-CM code for mallet finger of left finger(s), in the block M20-M25 (Other joint disorders).

Is M20.012 a billable code?

Yes. M20.012 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M20.012 belong to?

It belongs to category M20 – Acquired deformities of fingers and toes.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.