M24.64 – Ankylosis, hand

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

Non-billable header

ICD-10-CM code M24.64

Code: M24.64 (claims format: M2464)
Description: Ankylosis, hand
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: M24 › M24.6

Billable codes under M24.64

M24.64 is a header code and cannot be used on claims. Choose the most specific code:

M24.641 – Ankylosis, right handBillable
M24.642 – Ankylosis, left handBillable
M24.649 – Ankylosis, unspecified handBillable

Notes inherited from parent codes

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

M24 – Other specific joint derangements

Excludes1 (not coded here):

current injury - see injury of joint by body region

Excludes2 (not included here):

ganglion (M67.4)
snapping knee (M23.8-)
temporomandibular joint disorders (M26.6-)

M24.6 – Ankylosis of joint

Excludes1 (not coded here):

stiffness of joint without ankylosis (M25.6-)

Excludes2 (not included here):

spine (M43.2-)

Block M20-M25

Excludes2 (not included here):

joints of the spine (M40-M54)

Index terms for M24.64

Entries in the ICD-10-CM alphabetic index that lead to this code:

Ankylosis, hand

Related codes in M24.6

M24.60 – Ankylosis, unspecified jointBillable
M24.61 – Ankylosis, shoulderHeader
M24.62 – Ankylosis, elbowHeader
M24.63 – Ankylosis, wristHeader
M24.65 – Ankylosis, hipHeader
M24.66 – Ankylosis, kneeHeader
M24.67 – Ankylosis, ankle and footHeader
M24.69 – Ankylosis, other specified jointBillable

Frequently asked questions

What is ICD-10 code M24.64?

M24.64 is the ICD-10-CM code for ankylosis, hand, in the block M20-M25 (Other joint disorders).

Is M24.64 a billable code?

No. M24.64 is a header code with more specific child codes; report one of the billable codes listed above.

What category does M24.64 belong to?

It belongs to category M24 – Other specific joint derangements.

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.