M23
Non-billableInternal derangement of knee
Internal derangement of knee
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •arthropathic psoriasisL40.5
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •compartment syndrome (traumatic)A-)T79
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •joints of the spineM40-M54
- •current injury - see injury of knee and lower legS80-S89
- •recurrent dislocation or subluxation of jointsM24.4
- •recurrent dislocation or subluxation of patellaM22.0-M22.1
Child Codes (8)
M23.0Cystic meniscus
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
M23.9Unspecified internal derangement of knee
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(17)
UMLS
- Derangement of kneeC0158053
- Derangement of knee (disorder)C0158053
- IDK - Internal derangement of knee jointC0158053
- Internal derangement of kneeC0158053
- Internal derangement of knee jointC0158053
- Internal derangement of knee, unspecifiedC0158053
- Knee derangementC0158053
- Unspecified internal derangement of kneeC0158053
- Unspecified internal derangement of unspecified kneeC0158053
- derangement internal kneeC0158053
- derangement kneeC0158053
- derangement of kneeC0158053
- internal derangement kneeC0158053
- internal derangement of kneeC0158053
- internal knee derangementC0158053
- knee derangementC0158053
- knee internal derangementC0158053
Frequently Asked Questions
What is the ICD-10 code for internal derangement of knee?
The ICD-10-CM code for internal derangement of knee is M23. The full clinical description is "Internal derangement of knee". M23 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code M23 mean?
ICD-10-CM code M23 represents “Internal derangement of knee”. It is classified under Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue and is a non-billable header code. Use a more specific child code for billing purposes.
Is M23 a billable code?
No, M23 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 8 child codes under M23.
What chapter is M23 in?
M23 is in Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (codes M00-M99).
What codes cannot be used with M23?
M23 has Excludes1 notes indicating codes that cannot be used together with it, including: ankylosis (M24.66); deformity of knee (M21.-); osteochondritis dissecans (M93.2).
What are the subcategories under M23?
M23 has 8 child codes, including: M23.0 (Cystic meniscus), M23.2 (Derangement of meniscus due to old tear or injury), M23.3 (Other meniscus derangements), M23.4 (Loose body in knee), and 4 more.
What are the UMLS CUIs for M23?
M23 is linked to 1 UMLS Concept Unique Identifier: C0158053. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does M23 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like internal derangement of knee affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of M23?
M23 maps to the ICD-11 code: FA33.Z (Internal derangement of knee, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.