Chapter XIII
Diseases of the musculoskeletal system and connective tissue
(M00-M99)
Arthropathies
(M00-M25)
Disorders affecting predominantly peripheral (limb) joints
Other joint disorders
(M20-M25)
Excludes:
joints of the spine (M40-M54)
| M20 | Acquired deformities of fingers and toes Latin: Deformationes digitorum manus et digitorum pedis acquistae | |||||||
| Excludes: | acquired absence of fingers and toes (Z89.-) congenital: · absence of fingers and toes (Q71.3, Q72.3) · deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-) | |||||||
| M20.0 | Deformity of finger(s) Latin: Deformatio digiti manus | |||||||
| Boutonnière and swan-neck deformities | ||||||||
| Excludes: | clubbing of fingers (R68.3) palmar fascial fibromatosis [Dupuytren] (M72.0) trigger finger (M65.3) | |||||||
| M20.1 | Hallux valgus (acquired) Latin: Hallux valgus (acquisitus) | |||||||
| Bunion | ||||||||
| M20.2 | Hallux rigidus Latin: Hallux rigidus | |||||||
| M20.3 | Other deformity of hallux (acquired) Latin: Deformatio hallucis (acquisita) alia | |||||||
| Hallux varus | ||||||||
| M20.4 | Other hammer toe(s) (acquired) Latin: Deformatio digiti pedis (acquisita) alia | |||||||
| M20.5 | Other deformities of toe(s) (acquired) Latin: Deformationes digitorum pedis (asquisitae) | |||||||
| M20.6 | Acquired deformity of toe(s), unspecified Latin: Deformatio digiti pedis acquisita, non specificata | |||||||
| M21 | Other acquired deformities of limbs Latin: Deformationes extremitatum acquisitae aliae | |||||||
| [See site code at the beginning of this chapter] | ||||||||
| Excludes: | acquired absence of limb (Z89.-) acquired deformities of fingers or toes (M20.-) congenital: · absence of limbs (Q71-Q73) · deformities and malformations of limbs (Q65-Q66, Q68-Q74) coxa plana (M91.2) | |||||||
| M21.0 | Valgus deformity, not elsewhere classified Latin: Deformatio valga | |||||||
| Excludes: | metatarsus valgus (Q66.6) talipes calcaneovalgus (Q66.4) | |||||||
| M21.1 | Varus deformity, not elsewhere classified Latin: Deformatio vara | |||||||
| Excludes: | metatarsus varus (Q66.2) tibia vara (M92.5) | |||||||
| M21.2 | Flexion deformity Latin: Deformatio flexionis | |||||||
| M21.3 | Wrist or foot drop (acquired) Latin: Articulus instabilis sive pes haerens (acquisitus) | |||||||
| M21.4 | Flat foot [pes planus] (acquired) Latin: Pes planus (acquisitus) | |||||||
| Excludes: | congenital pes planus (Q66.5) | |||||||
| M21.5 | Acquired clawhand, clubhand, clawfoot and clubfoot Latin: Manus onychogryphosa contracta asquisita et pes onychogryphosus contractus asquisitus | |||||||
| Excludes: | clubfoot, not specified as acquired (Q66.8) | |||||||
| M21.6 | Other acquired deformities of ankle and foot Latin: Deformationes malleoli et pedis acquisitae aliae | |||||||
| Excludes: | deformities of toe (acquired) (M20.1-M20.6) | |||||||
| M21.7 | Unequal limb length (acquired) Latin: Longitudo extremitatum impar (acquisita) | |||||||
| M21.8 | Other specified acquired deformities of limbs Latin: Deformationes extremitatum acquisitae aliae, specificatae | |||||||
| M21.9 | Acquired deformity of limb, unspecified Latin: Deformatio extremitatis acquisita, non specificata | |||||||
| M22 | Disorders of patella Latin: Morbi patellae | |||||||
| Excludes: | dislocation of patella (S83.0) | |||||||
| M22.0 | Recurrent dislocation of patella Latin: Luxatio patellae recurrens (recidiva) | |||||||
| M22.1 | Recurrent subluxation of patella Latin: Subluxatio patellae recurrens | |||||||
| M22.2 | Patellofemoral disorders Latin: Disordines patellofemorales | |||||||
| M22.3 | Other derangements of patella Latin: Mutationes patellae aliae | |||||||
| M22.4 | Chondromalacia patellae Latin: Shondromalacia patellae | |||||||
| M22.8 | Other disorders of patella Latin: Morbi patellae alii | |||||||
| M22.9 | Disorder of patella, unspecified Latin: Morbus patellae, non specificatus | |||||||
| M23 | Internal derangement of knee Latin: Morbi genus interni | |||||||||
| The following supplementary subclassification to indicate the site of involvement is provided for optional use with appropriate subcategories in M23.-; see also note at the beginning of this chapter. | ||||||||||
| 0 | Multiple sites | |||||||||
| 1 | Anterior cruciate ligament or Anterior horn of medial meniscus | |||||||||
| 2 | Posterior cruciate ligament or Posterior horn of medial meniscus | |||||||||
| 3 | Medial collateral ligament or Other and unspecified medial meniscus | |||||||||
| 4 | Lateral collateral ligament or Anterior horn of lateral meniscus | |||||||||
| 5 | Posterior horn of lateral meniscus | |||||||||
| 6 | Other and unspecified lateral meniscus | |||||||||
| 7 | Capsular ligament | |||||||||
| 9 | Unspecified ligament or Unspecified meniscus | |||||||||
| Excludes: | ankylosis (M24.6) current injury - see injury to the knee and lower leg (S80-S89) deformity of knee (M21.-) disorders of patella (M22.-) osteochondritis dissecans (M93.2) recurrent dislocation or subluxation (M24.4) · patella (M22.0-M22.1) | |||||||||
| M23.0 | Cystic meniscus Latin: Cystis menisci genus | |||||||||
| M23.1 | Discoid meniscus (congenital) Latin: Meniscus genus discoides (congenitus) | |||||||||
| M23.2 | Derangement of meniscus due to old tear or injury Latin: Laesio menisci genus traumatica obsoleta |
|||||||||
| Old bucket-handle tear | ||||||||||
| M23.3 | Other meniscus derangements Latin: Mutationes menisci aliae | |||||||||
| Degenerate Detached Retained | } } } | meniscus | ||||||||
| M23.4 | Loose body in knee Latin: Corpus liberum genus | |||||||||
| M23.5 | Chronic instability of knee Latin: Instabilitas genus chronica | |||||||||
| M23.6 | Other spontaneous disruption of ligament(s) of knee Latin: Ruptura ligamenti genus spontanea alia | |||||||||
| M23.8 | Other internal derangements of knee Latin: Mutationes genus internae aliae | |||||||||
| Laxity of ligament of knee Snapping knee | ||||||||||
| M23.9 | Internal derangement of knee, unspecified Latin: Mutatio genus interna, non specificata | |||||||||
| M24 | Other specific joint derangements Latin: Morbi arbiculorum alii, specificati |
|||||||
| [See site code at the beginning of this chapter] | ||||||||
| Excludes: | current injury - see injury of joint by body region ganglion (M67.4) snapping knee (M23.8) temporomandibular joint disorders (K07.6) | |||||||
| M24.0 | Loose body in joint Latin: Corpus liberum articuli | |||||||
| Excludes: | loose body in knee (M23.4) | |||||||
| M24.1 | Other articular cartilage disorders Latin: Morbi cartilaginis articularis alii | |||||||
| Excludes: | chondrocalcinosis (M11.1-M11.2) internal derangement of knee (M23.-) metastatic calcification (E83.5) ochronosis (E70.2) | |||||||
| M24.2 | Disorder of ligament Latin: Morbus ligamenti | |||||||
| Instability secondary to old ligament injury Ligamentous laxity NOS | ||||||||
| Excludes: | familial ligamentous laxity
(M35.7) knee (M23.5-M23.8) | |||||||
| M24.3 | Pathological dislocation and subluxation of joint, not elsewhere classified Latin: Luxatio et subluxatio articuli pathologica | |||||||
| Excludes: | dislocation or displacement of joint: · congenital - see congenital malformations and deformations of the musculoskeletal system (Q65-Q79) · current injury - see injury of joints and ligaments by body region · recurrent (M24.4) | |||||||
| M24.4 | Recurrent dislocation and subluxation of joint Latin: Luxatio et subluxatio articuli recidiva | |||||||
| Excludes: | patella
(M22.0-M22.1) vertebral subluxation (M43.3-M43.5) | |||||||
| M24.5 | Contracture of joint Latin: Contractura articuli | |||||||
| Excludes: | acquired deformities of limbs
(M20-M21) contracture of tendon (sheath) without contracture of joint (M67.1) Dupuytren's contracture (M72.0) | |||||||
| M24.6 | Ankylosis of joint Latin: Ankylosis articuli | |||||||
| Excludes: | spine (M43.2) stiffness of joint without ankylosis (M25.6) | |||||||
| M24.7 | Protrusio acetabuli Latin: Protrusio acetabuli | |||||||
| M24.8 | Other specific joint derangements, not elsewhere classified Latin: Mutationes articuli aliae, specificatae |
|||||||
| Irritable hip | ||||||||
| Excludes: | that involving iliotibial band syndrome (M76.3) | |||||||
| M24.9 | Joint derangement, unspecified Latin: Mutatio articuli, non specificata | |||||||
| M25 | Other joint disorders, not elsewhere classified Latin: Morbi articulorum alii | |||||||
| [See site code at the beginning of this chapter] | ||||||||
| Excludes: | abnormality of gait and mobility (R26.-) calcification of: · bursa (M71.4) · shoulder (joint) (M75.3) · tendon (M65.2) deformities classified to M20-M21 difficulty in walking (R26.2) | |||||||
| M25.0 | Haemarthrosis Latin: Haemorthrosis | |||||||
| Excludes: | current injury - see injury of joint by body region | |||||||
| M25.1 | Fistula of joint Latin: Fistula articuli | |||||||
| M25.2 | Flail joint Latin: Instabilitas articuli | |||||||
| M25.3 | Other instability of joint Latin: Instabilitas articuli alia | |||||||
| Excludes: | instability of joint secondary to: · old ligament injury (M24.2) · removal of joint prosthesis (M96.8) | |||||||
| M25.4 | Effusion of joint Latin: Hydrarthron | |||||||
| Excludes: | hydrarthrosis of yaws (A66.6) | |||||||
| M25.5 | Pain in joint Latin: Arthralgia | |||||||
| M25.6 | Stiffness of joint, not elsewhere classified Latin: Rigiditas articuli | |||||||
| M25.7 | Osteophyte Latin: Osteophyton | |||||||
| M25.8 | Other specified joint disorders Latin: Morbi articulorum alii, specificati | |||||||
| M25.9 | Joint disorder, unspecified Latin: Morbus articuli, non specificatus | |||||||
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