Diseases of the musculoskeletal system and connective tissue (M00-M99)

Note:
Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Excludes 2:
arthropathic psoriasis (L40.5-)
certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
compartment syndrome (traumatic) (T79.A-)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Other joint disorders (M20-M25)

Excludes 2:
joints of the spine (M40-M54)
M20 Acquired deformities of fingers and toes [+]
Excludes 1: acquired absence of fingers and toes (Z89.-)
congenital absence of fingers and toes (Q71.3-, Q72.3-)
congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)
M21 Other acquired deformities of limbs [+]
Excludes 1: acquired absence of limb (Z89.-)
congenital absence of limbs (Q71-Q73)
congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
Excludes 2: acquired deformities of fingers or toes (M20.-)
coxa plana (M91.2)
M22 Disorder of patella [+]
Excludes 2: traumatic dislocation of patella (S83.0-)
M23 Internal derangement of knee [+]
Excludes 1: ankylosis (M24.66)
deformity of knee (M21.-)
osteochondritis dissecans (M93.2)
Excludes 2: current injury - see injury of knee and lower leg (S80-S89)
recurrent dislocation or subluxation of joints (M24.4)
recurrent dislocation or subluxation of patella (M22.0-M22.1)
M24 Other specific joint derangements [+]
Excludes 1: current injury - see injury of joint by body region
Excludes 2: ganglion (M67.4)
snapping knee (M23.8-)
temporomandibular joint disorders (M26.6-)
M25 Other joint disorder, not elsewhere classified [+]
Excludes 2: abnormality of gait and mobility (R26.-)
acquired deformities of limb (M20-M21)
calcification of bursa (M71.4-)
calcification of shoulder (joint) (M75.3)
calcification of tendon (M65.2-)
difficulty in walking (R26.2)
temporomandibular joint disorder (M26.6-)

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