ICD-10-CM › M00-M99 › M20-M25 › M codes › M23

M23

Internal derangement of knee

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 8 more specific codes instead:

  • M23.0 Cystic meniscus (also a header)
  • M23.2 Derangement of meniscus due to old tear or injury (also a header)
  • M23.3 Other meniscus derangements (also a header)
  • M23.4 Loose body in knee (also a header)
  • M23.5 Chronic instability of knee (also a header)
  • M23.6 Other spontaneous disruption of ligament(s) of knee (also a header)
  • M23.8 Other internal derangements of knee (also a header)
  • M23.9 Unspecified internal derangement of knee (also a header)

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

  1. FY2012 Added to the draft code set draft Internal derangement of knee

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

This code

Excludes1 - never coded here

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

Excludes2 - not included here

  • 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)

Inherited from the M20-M25 section Other joint disorders (M20-M25)

Excludes2 - not included here

  • joints of the spine (M40-M54)