M20.0 – Deformity of finger(s)

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

Non-billable header

ICD-10-CM code M20.0

Code: M20.0 (claims format: M200)
Description: Deformity of finger(s)
Billable: No – use a more specific code below
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

Billable codes under M20.0

M20.0 is a header code and cannot be used on claims. Choose the most specific code:

M20.00 – Unspecified deformity of finger(s)Header (more codes below)
M20.01 – Mallet fingerHeader (more codes below)
M20.02 – Boutonniere deformityHeader (more codes below)
M20.03 – Swan-neck deformityHeader (more codes below)
M20.09 – Other deformity of finger(s)Header (more codes below)

Notes for M20.0

Excludes1 (not coded here):

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

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.-)

Block M20-M25

Excludes2 (not included here):

joints of the spine (M40-M54)

Related codes in M20

M20.1 – Hallux valgus (acquired)Header
M20.2 – Hallux rigidusHeader
M20.3 – Hallux varus (acquired)Header
M20.4 – Other hammer toe(s) (acquired)Header
M20.5 – Other deformities of toe(s) (acquired)Header
M20.6 – Acquired deformities of toe(s), unspecifiedHeader

Frequently asked questions

What is ICD-10 code M20.0?

M20.0 is the ICD-10-CM code for deformity of finger(s), in the block M20-M25 (Other joint disorders).

Is M20.0 a billable code?

No. M20.0 is a header code with more specific child codes; report one of the billable codes listed above.

What category does M20.0 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.