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M23.204

Derangement of unspecified medial meniscus due to old tear or injury, left knee

Billable FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 8 more specific codes sit alongside it. Worth checking whether the documentation supports one of them.
Exclusions 16 never code together
M23code
Excludes1
  • ankylosis (M24.66)M24.66
  • deformity of knee (M21.-)M21.-
  • osteochondritis dissecans (M93.2)M93.2
Excludes2
  • current injury - see injury of knee and lower leg (S80-S89)S80-S89
  • recurrent dislocation or subluxation of joints (M24.4)M24.4
  • recurrent dislocation or subluxation of patella (M22.0-M22.1)M22.0-M22.1
M00-M99chapter
Excludes2
  • arthropathic psoriasis (L40.5-)L40.5-
  • certain conditions originating in the perinatal period (P04-P96)P04-P96
  • certain infectious and parasitic diseases (A00-B99)A00-B99
  • compartment syndrome (traumatic) (T79.A-)T79.A-
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Q00-Q99
  • endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
  • injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
  • neoplasms (C00-D49)C00-D49
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 3
M23.2code
Inclusion terms
  • Old bucket-handle tear
M00-M25block
Includes
  • Disorders affecting predominantly peripheral (limb) joints
M00-M99chapter
Notes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Index entries leading here 1
Alongside this code 8 same parent — M23.20
M23.200 Derang of unsp lat mensc due to old tear/inj, right knee M23.201 Derangement of unsp lat mensc due to old tear/inj, left knee M23.202 Derangement of unsp lat mensc due to old tear/inj, unsp knee M23.203 Derang of unsp medial meniscus due to old tear/inj, r knee M23.205 Derang of unsp medial mensc due to old tear/inj, unsp knee M23.206 Derangement of unsp meniscus due to old tear/inj, right knee M23.207 Derangement of unsp meniscus due to old tear/inj, left knee M23.209 Derangement of unsp meniscus due to old tear/inj, unsp knee
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable
yes
Code set
FY2026
Parent
M23.20
Block
M00-M25
Siblings
8

Present FY2024–FY2027.