Is M24 a billable ICD-10-CM code?

No. M24 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M24 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other joint disorders (M20-M25).

What cannot be coded together with M24?

M24 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

M24

M24 — Other specific joint derangements

Non-billable headerICD-10-CM

M24 is a non-billable header ICD-10-CM code for other specific joint derangements. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

current injury - see injury of joint by body region

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

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

Other codes that can never be billed with M24

These codes carry an Excludes1 note pointing at M24. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M24 alone.

M23Internal derangement of knee
M24.3Pathological dislocation of joint, not elsewhere classified
M25.3Other instability of joint
M25.6Stiffness of joint, not elsewhere classified
M35.7Hypermobility syndrome
M62.4Contracture of muscle

Risk adjustment

M24 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead M24

10 child codes. Green means billable.

Questions about M24

Is M24 a billable ICD-10-CM code?: No. M24 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M24 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other joint disorders (M20-M25).
What cannot be coded together with M24?: M24 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.