M23.301
Other meniscus derangements, unspecified lateral meniscus, 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
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 5
M23.3code
Inclusion terms
- Degenerate meniscus
- Detached meniscus
- Retained meniscus
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 — M23.30
M23.300 Oth meniscus derangements, unsp lateral meniscus, right knee M23.302 Oth meniscus derangements, unsp lateral meniscus, unsp knee M23.303 Oth meniscus derangements, unsp medial meniscus, right knee M23.304 Other meniscus derangements, unsp medial meniscus, left knee M23.305 Other meniscus derangements, unsp medial meniscus, unsp knee M23.306 Other meniscus derangements, unsp meniscus, right knee M23.307 Other meniscus derangements, unspecified meniscus, left knee M23.309 Other meniscus derangements, unsp meniscus, unspecified 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.