M23.339 Other meniscus derangements, other medial meniscus, unspecified knee

ICD-10-CM Diagnosis Code M23.339: Other Meniscus Derangements, Other Medial Meniscus, Unspecified Knee

ICD-10-CM code M23.339 designates other meniscus derangements involving the other medial meniscus of an unspecified knee. This active, billable diagnosis concept falls under parent code M23.33. Clinical literature notes medial meniscus involvement in chronic knee injuries, while payer articles list related right and left medial knee codes for orthoses. 1 2 3 4

Plain-language overview

Code M23.339 identifies a disease or syndrome classification for other meniscus derangements specifically involving the other medial meniscus when the affected knee is unspecified. 1

What this code represents

The terminology record establishes M23.339 as an active concept with the parent code M23.33, which denotes other meniscus derangements of the other medial meniscus. 1

The designation for M23.339 indicates an unspecified knee, distinguishing it from related codes that specify the right or left knee for the same medial meniscus derangement. 1 3

Coding details

Code M23.339 is classified as a billable diagnosis, and the official terminology record indicates that this concept has narrower concepts within the ICD-10-CM system. 1 4

Documentation considerations

The terminology record for M23.339 specifies an unspecified knee, and a related Medicare policy article lists distinct codes for right and left medial meniscus derangements. 1 3

Clinical context

Clinical literature indicates that the medial meniscus is more involved in chronic cases of anterior cruciate ligament ruptures, while lateral meniscus injuries are noted in acute tears. 2

Coverage and utilization context

A Medicare policy article for knee orthoses includes related meniscus derangement codes specifying right and left knees, placing M23.339 in a broader context of orthoses policy lists. 3

What the sources add

While the terminology record defines the active disease classification for M23.339, the billing agency source explicitly confirms its billable status and lists a related lateral meniscus code. 1 4

Comparing sources reveals that official terminology records provide the hierarchical structure and active status, whereas clinical literature describes anatomical associations with ligament injuries rather than coding rules. 1 2

Sources

1. ICD-10-CM M23.339 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Knee Orthoses - Policy Article (A52465) — cms.gov; accessed 2026-07-27.
4. Codigo. The #1 Billing Agency for Medical Practices — codigo.care; accessed 2026-07-27.