Is M23.0 a billable ICD-10-CM code?

No. M23.0 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M23.0 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 M23.0?

M23.0 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M23.0 (M23) and apply to it just the same.

M23.0

M23.0 — Cystic meniscus

Non-billable headerICD-10-CM

M23.0 is a non-billable header ICD-10-CM code for cystic meniscus. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above M23.0

These are not written on M23.0, but they bind it: a note on a category applies to every code beneath it. Billing M23.0 with anything listed here is a denial.

Written on M23 — Internal derangement of knee

ankylosis (M24.66)
deformity of knee (M21.-)
osteochondritis dissecans (M93.2)

Excludes2 inherited from the categories above M23.0

Also inherited, and the opposite of Excludes1: these conditions are not part of M23.0, but a patient can have both, so you may code both.

Written on M23 — Internal derangement of knee

current injury - see injury of knee and lower leg (S80-S89)
recurrent dislocation or subluxation of joints (M24.4)
recurrent dislocation or subluxation of patella (M22.0-M22.1)

Risk adjustment

M23.0 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 history

M23.0 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead M23.0

7 child codes. Green means billable.

Related codes at this level

Codes that share M23. If M23.0 is not quite right, the correct code is usually one of these.

Questions about M23.0

Is M23.0 a billable ICD-10-CM code?: No. M23.0 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M23.0 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 M23.0?: M23.0 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M23.0 (M23) and apply to it just the same.