M20 Acquired deformities of fingers and toes

Excl.:

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)

Incl.:

Boutonnière and swan-neck deformities

Excl.:

clubbing of fingers ( R68.3)

palmar fascial fibromatosis [Dupuytren] ( M72.0)

trigger finger ( M65.3)

M20.1 Hallux valgus (acquired)

Incl.:

Bunion

M20.2 Hallux rigidus

M20.3 Other deformity of hallux (acquired)

Incl.:

Hallux varus

M20.4 Other hammer toe(s) (acquired)

M20.5 Other deformities of toe(s) (acquired)

M20.6 Acquired deformity of toe(s), unspecified

M21 Other acquired deformities of limbs

Modifier-Hint

[See site code at the beginning of this chapter]

Excl.:

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

Excl.:

metatarsus valgus ( Q66.6)

talipes calcaneovalgus ( Q66.4)

M21.1 Varus deformity, not elsewhere classified

Excl.:

metatarsus varus ( Q66.2)

tibia vara ( M92.5)

M21.2 Flexion deformity

M21.3 Wrist or foot drop (acquired)

M21.4 Flat foot [pes planus] (acquired)

Excl.:

congenital pes planus ( Q66.5)

M21.5 Acquired clawhand, clubhand, clawfoot and clubfoot

Excl.:

clubfoot, not specified as acquired ( Q66.8)

M21.6 Other acquired deformities of ankle and foot

Excl.:

deformities of toe (acquired) ( M20.1-M20.6)

M21.7 Unequal limb length (acquired)

M21.8 Other specified acquired deformities of limbs

M21.9 Acquired deformity of limb, unspecified

M22 Disorders of patella

Excl.:

dislocation of patella ( S83.0)

M22.0 Recurrent dislocation of patella

M22.1 Recurrent subluxation of patella

M22.2 Patellofemoral disorders

M22.3 Other derangements of patella

M22.4 Chondromalacia patellae

M22.8 Other disorders of patella

M22.9 Disorder of patella, unspecified

M23 Internal derangement of knee

Modifier-Hint

Excl.:

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)

recurrent dislocation or subluxation

• patella (M22.0-M22.1)

Modifiers

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.

Code	Title
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

M23.0 Cystic meniscus

M23.1 Discoid meniscus (congenital)

M23.2 Derangement of meniscus due to old tear or injury

Incl.:

Old bucket-handle tear

M23.3 Other meniscus derangements

Incl.:

Degenerate Detached Retained

meniscus

M23.4 Loose body in knee

M23.5 Chronic instability of knee

M23.6 Other spontaneous disruption of ligament(s) of knee

M23.8 Other internal derangements of knee

Incl.:

Laxity of ligament of knee

Snapping knee

M23.9 Internal derangement of knee, unspecified

M24 Other specific joint derangements

Modifier-Hint

[See site code at the beginning of this chapter]

Excl.:

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

Excl.:

loose body in knee ( M23.4)

M24.1 Other articular cartilage disorders

Excl.:

chondrocalcinosis ( M11.1-M11.2)

internal derangement of knee ( M23.-)

metastatic calcification ( E83.5)

ochronosis ( E70.2)

M24.2 Disorder of ligament

Incl.:

Instability secondary to old ligament injury

Ligamentous laxity NOS

Excl.:

familial ligamentous laxity ( M35.7)

knee ( M23.5-M23.8)

M24.3 Pathological dislocation and subluxation of joint, not elsewhere classified

Excl.:

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

Excl.:

patella ( M22.0-M22.1)

vertebral subluxation ( M43.3-M43.5)

M24.5 Contracture of joint

Excl.:

acquired deformities of limbs ( M20-M21)

contracture of tendon (sheath) without contracture of joint ( M67.1)

Dupuytren contracture ( M72.0)

M24.6 Ankylosis of joint

Excl.:

spine ( M43.2)

stiffness of joint without ankylosis ( M25.6)

M24.7 Protrusio acetabuli

M24.8 Other specific joint derangements, not elsewhere classified

Excl.:

involving iliotibial band syndrome ( M76.3)

M24.9 Joint derangement, unspecified

M25 Other joint disorders, not elsewhere classified

Modifier-Hint

[See site code at the beginning of this chapter]

Excl.:

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

Excl.:

current injury - see injury of joint by body region

M25.1 Fistula of joint

M25.2 Flail joint

M25.3 Other instability of joint

Excl.:

instability of joint secondary to:

• old ligament injury (M24.2)
• removal of joint prosthesis (M96.8)

M25.4 Effusion of joint

Excl.:

hydrarthrosis of yaws ( A66.6)

M25.5 Pain in joint

M25.6 Stiffness of joint, not elsewhere classified

M25.7 Osteophyte

M25.8 Other specified joint disorders

M25.9 Joint disorder, unspecified