A00-B99 C00-D48D50-D89 E00-E90 F00-F99 G00-G99 H00-H59 H60-H95 I00-I99 J00-J99 K00-K93
L00-L99 M00-M99 N00-N99 O00-O99 P00-P96 Q00-Q99 R00-R99 S00-T98 V01-Y98 Z00-Z99 U00-U99

M20-M25 Other joint disorders

Chapter XIII

Diseases of the musculoskeletal system and connective tissue


Disorders affecting predominantly peripheral (limb) joints

Other joint disorders

joints of the spine (M40-M54)

M20Acquired deformities of fingers and toes
Latin: Deformationes digitorum manus et digitorum pedis acquistae
Excludes:acquired absence of fingers and toes (Z89.-)
· 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)
M20.1Hallux valgus (acquired)
Latin: Hallux valgus (acquisitus)
M20.2Hallux rigidus
Latin: Hallux rigidus
M20.3Other deformity of hallux (acquired)
Latin: Deformatio hallucis (acquisita) alia
Hallux varus
M20.4Other hammer toe(s) (acquired)
Latin: Deformatio digiti pedis (acquisita) alia
M20.5Other deformities of toe(s) (acquired)
Latin: Deformationes digitorum pedis (asquisitae)
M20.6Acquired deformity of toe(s), unspecified
Latin: Deformatio digiti pedis acquisita, non specificata
M21Other 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.-)
· absence of limbs (Q71-Q73)
· deformities and malformations of limbs (Q65-Q66, Q68-Q74)
coxa plana (M91.2)
M21.0Valgus 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)
M21.2Flexion deformity
Latin: Deformatio flexionis
M21.3 Wrist or foot drop (acquired)
Latin: Articulus instabilis sive pes haerens (acquisitus)
M21.4Flat foot [pes planus] (acquired)
Latin: Pes planus (acquisitus)
Excludes:congenital pes planus (Q66.5)
M21.5Acquired clawhand, clubhand, clawfoot and clubfoot
Latin: Manus onychogryphosa contracta asquisita et pes onychogryphosus contractus asquisitus
Excludes:clubfoot, not specified as acquired (Q66.8)
M21.6Other acquired deformities of ankle and foot
Latin: Deformationes malleoli et pedis acquisitae aliae
Excludes: deformities of toe (acquired) (M20.1-M20.6)
M21.7Unequal limb length (acquired)
Latin: Longitudo extremitatum impar (acquisita)
M21.8 Other specified acquired deformities of limbs
Latin: Deformationes extremitatum acquisitae aliae, specificatae
M21.9Acquired 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)
M22.1Recurrent subluxation of patella
Latin: Subluxatio patellae recurrens
M22.2Patellofemoral disorders
Latin: Disordines patellofemorales
M22.3Other derangements of patella
Latin: Mutationes patellae aliae
M22.4Chondromalacia patellae
Latin: Shondromalacia patellae
M22.8Other disorders of patella
Latin: Morbi patellae alii
M22.9Disorder of patella, unspecified
Latin: Morbus patellae, non specificatus
M23Internal 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.
0Multiple sites
1Anterior cruciate ligament or Anterior horn of medial meniscus
2Posterior cruciate ligament or Posterior horn of medial meniscus
3Medial collateral ligament or Other and unspecified medial meniscus
4Lateral collateral ligament or Anterior horn of lateral meniscus
5Posterior horn of lateral meniscus
6Other and unspecified lateral meniscus
7Capsular ligament
9Unspecified 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)
M23.0Cystic meniscus
Latin: Cystis menisci genus
M23.1Discoid meniscus (congenital)
Latin: Meniscus genus discoides (congenitus)
M23.2Derangement of meniscus due to old tear or injury
Latin: Laesio menisci genus traumatica obsoleta
Old bucket-handle tear
M23.3Other meniscus derangements
Latin: Mutationes menisci aliae
M23.4Loose body in knee
Latin: Corpus liberum genus
M23.5Chronic instability of knee
Latin: Instabilitas genus chronica
M23.6Other spontaneous disruption of ligament(s) of knee
Latin: Ruptura ligamenti genus spontanea alia
M23.8Other internal derangements of knee
Latin: Mutationes genus internae aliae
Laxity of ligament of knee
Snapping knee
M23.9Internal derangement of knee, unspecified
Latin: Mutatio genus interna, non specificata
M24Other 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)
M24.0Loose body in joint
Latin: Corpus liberum articuli
Excludes:loose body in knee (M23.4)
M24.1Other 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)
M24.2Disorder 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)
M24.3Pathological 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)
M24.4Recurrent dislocation and subluxation of joint
Latin: Luxatio et subluxatio articuli recidiva
Excludes:patella (M22.0-M22.1)
vertebral subluxation (M43.3-M43.5)
M24.5Contracture 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)
M24.6Ankylosis of joint
Latin: Ankylosis articuli
Excludes:spine (M43.2)
stiffness of joint without ankylosis (M25.6)
M24.7Protrusio 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)
M24.9Joint 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)
Latin: Haemorthrosis
Excludes:current injury - see injury of joint by body region
M25.1Fistula of joint
Latin: Fistula articuli
M25.2Flail joint
Latin: Instabilitas articuli
M25.3Other instability of joint
Latin: Instabilitas articuli alia
Excludes:instability of joint secondary to:
· old ligament injury (M24.2)
· removal of joint prosthesis (M96.8)
M25.4Effusion of joint
Latin: Hydrarthron
Excludes:hydrarthrosis of yaws (A66.6)
M25.5Pain in joint
Latin: Arthralgia
M25.6Stiffness of joint, not elsewhere classified
Latin: Rigiditas articuli
Latin: Osteophyton
M25.8Other specified joint disorders
Latin: Morbi articulorum alii, specificati
M25.9Joint disorder, unspecified
Latin: Morbus articuli, non specificatus