M23 is the ICD-10 code for Internal derangement of knee. It is a three-character category divided into 9 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block M20–M25 (Other joint disorders) in Chapter XIII, Diseases of the musculoskeletal system and connective tissue.
- Code type
- Category (3 characters)
- Chapter
- XIII · M00–M99
- Classification
- WHO ICD-10, 2019 version
What M23 excludes
Conditions that look similar but belong under another code.
Subcodes of M23
- M23.0Cystic meniscus
- M23.1Discoid meniscus (congenital)
- M23.2Derangement of meniscus due to old tear or injury
- M23.3Other meniscus derangements
- M23.4Loose body in knee
- M23.5Chronic instability of knee
- M23.6Other spontaneous disruption of ligament(s) of knee
- M23.8Other internal derangements of knee
- M23.9Internal derangement of knee, unspecified
M23 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DM23Lidelser i knæled
M23Polven sisäiset viat
M23Binnenschädigung des Kniegelenkes [internal derangement]
M23Lésion interne du genou
M23dérangement interne van knie
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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