Chapter XIII

Diseases of the musculoskeletal system and connective tissue

Soft tissue disorders

Disorders of muscles

Excludes: dermatopolymyositis ( M33.- )
muscular dystrophies and myopathies ( G71-G72 )
myopathy in:
· amyloidosis ( E85.- )
· polyarteritis nodosa ( M30.0 )
· rheumatoid arthritis ( M05.3 )
· scleroderma ( M34.- )
· Sjögren's syndrome ( M35.0 )
· systemic lupus erythematosus ( M32.- )

M60 Myositis
[See site code at the beginning of this chapter ]
M60.0 Infective myositis
Tropical pyomyositis
Use additional code (B95-B97), if desired, to identify infectious agent.
M60.1 Interstitial myositis
M60.2 Foreign body granuloma of soft tissue, not elsewhere classified
Excludes: foreign body granuloma of skin and subcutaneous tissue ( L92.3 )
M60.8 Other myositis
M60.9 Myositis, unspecified

M61 Calcification and ossification of muscle
[See site code at the beginning of this chapter ]
M61.0 Myositis ossificans traumatica
M61.1 Myositis ossificans progressiva
Fibrodysplasia ossificans progressiva
M61.2 Paralytic calcification and ossification of muscle
Myositis ossificans associated with quadriplegia or paraplegia
M61.3 Calcification and ossification of muscles associated with burns
Myositis ossificans associated with burns
M61.4 Other calcification of muscle
Excludes: calcific tendinitis ( M65.2 )
· of shoulder ( M75.3 )
M61.5 Other ossification of muscle
M61.9 Calcification and ossification of muscle, unspecified

M62 Other disorders of muscle
[See site code at the beginning of this chapter ]
Excludes: cramp and spasm ( R25.2 )
myalgia ( M79.1 )
· alcoholic ( G72.1 )
· drug-induced ( G72.0 )
stiff-man syndrome ( G25.8 )
M62.0 Diastasis of muscle
M62.1 Other rupture of muscle (nontraumatic)
Excludes: rupture of tendon ( M66.- )
traumatic rupture of muscle - see injury of muscle by body region
M62.2 Ischaemic infarction of muscle
Compartment syndrome, non-traumatic
Excludes: compartment syndrome, traumatic ( T79.6 )
traumatic ischaemia of muscle ( T79.6 )
Volkmann's ischaemic contracture ( T79.6 )
M62.3 Immobility syndrome (paraplegic)
M62.4 Contracture of muscle
Excludes: contracture of joint ( M24.5 )
M62.5 Muscle wasting and atrophy, not elsewhere classified
Disuse atrophy NEC
M62.6 Muscle strain
Excludes: current injury - see injury of muscle by body region
M62.8 Other specified disorders of muscle


Muscle (sheath) hernia
M62.9 Disorder of muscle, unspecified

M63* Disorders of muscle in diseases classified elsewhere
Excludes: myopathy in:
· endocrine diseases ( G73.5* )
· metabolic diseases ( G73.6* )
M63.0* Myositis in bacterial diseases classified elsewhere
Myositis in:
· leprosy [Hansen's disease] ( A30.-+ )
· syphilis ( A51.4+ , A52.7+ )
M63.1* Myositis in protozoal and parasitic infections classified elsewhere
Myositis in:
· cysticercosis ( B69.8+ )
· schistosomiasis [bilharziasis] ( B65.-+ )
· toxoplasmosis ( B58.8+ )
· trichinellosis ( B75+ )
M63.2* Myositis in other infectious diseases classified elsewhere
Myositis in mycosis ( B35-B49+ )
M63.3* Myositis in sarcoidosis ( D86.8+ )
M63.8* Other disorders of muscle in diseases classified elsewhere