Is M23.4 a billable ICD-10-CM code?

No. M23.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M23.4 sit in the tabular list?

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

M23.4

M23.4 — Loose body in knee

Non-billable headerICD-10-CM

M23.4 is a non-billable header ICD-10-CM code for loose body in knee. It cannot be billed on its own: choose one of the more specific child codes below.

Risk adjustment

M23.4 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 M23.4

3 child codes. Green means billable.

M23.40Loose body in knee, unspecified knee
M23.41Loose body in knee, right knee
M23.42Loose body in knee, left knee

Related codes at this level

Codes that share M23. If M23.4 is not quite right, the correct code is usually one of these.

M23.0Cystic meniscus
M23.2Derangement of meniscus due to old tear or injury
M23.3Other meniscus derangements
M23.5Chronic instability of knee
M23.6Other spontaneous disruption of ligament(s) of knee
M23.8Other internal derangements of knee
M23.9Unspecified internal derangement of knee

Questions about M23.4

Is M23.4 a billable ICD-10-CM code?: No. M23.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M23.4 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other joint disorders (M20-M25).