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Diseases of the musculoskeletal system and connective tissue
NOTES:
Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
EXCLUDES2:
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)
Chapter: 13: Diseases of the musculoskeletal system and connective tissue
M00-M25Arthropathies
NOTES:
 This block comprises arthropathies due to microbiological agents. Distinction is made between the following types of etiological relationship:
 a) direct infection of joint, where organisms invade synovial tissue and microbial antigen is present in the joint;
 b) indirect infection, which may be of two types: a reactive arthropathy, where microbial infection of the body is established but neither organisms nor antigens can be identified in the joint, and a postinfective arthropathy, where microbial antigen is present but recovery of an organism is inconstant and evidence of local multiplication is lacking.
INCLUDES:
 Disorders affecting predominantly peripheral (limb) joints
Arthropathies
M04Autoinflammatory syndromes
M05-M14Inflammatory polyarthropathies
M15-M19Osteoarthritis
EXCLUDES2:
 osteoarthritis of spine (M47.-)
Osteoarthritis
M20-M25Other joint disorders
EXCLUDES2:
 joints of the spine (M40-M54)
Other joint disorders
M26-M27Dentofacial anomalies [including malocclusion] and other disorders of jaw
EXCLUDES1:
 hemifacial atrophy or hypertrophy (Q67.4)
 unilateral condylar hyperplasia or hypoplasia (M27.8)
Dentofacial anomalies [including malocclusion] and other disorders of jaw
M30-M36Systemic connective tissue disorders
INCLUDES:
 autoimmune disease NOS
 collagen (vascular) disease NOS
 systemic autoimmune disease
 systemic collagen (vascular) disease
EXCLUDES1:
 autoimmune disease, single organ or single cell-type -code to relevant condition category
Systemic connective tissue disorders
M40-M54Dorsopathies
M45-M49Spondylopathies
M50-M54Other dorsopathies
EXCLUDES1:
 current injury - see injury of spine by body region
 discitis NOS (M46.4-)
Other dorsopathies
M60-M79Soft tissue disorders
EXCLUDES1:
 dermatopolymyositis (M33.-)
 muscular dystrophies and myopathies (G71-G72)
 myopathy in amyloidosis (E85.-)
 myopathy in polyarteritis nodosa (M30.0)
 myopathy in rheumatoid arthritis (M05.32) myopathy in scleroderma (M34.-)
 myopathy in Sjögren's syndrome (M35.03)
 myopathy in systemic lupus erythematosus (M32.-)
Soft tissue disorders
M65-M67Disorders of synovium and tendon
M70-M79Other soft tissue disorders
M80-M94Osteopathies and chondropathies
M86-M90Other osteopathies
EXCLUDES1:
 postprocedural osteopathies (M96.-)
Other osteopathies
M91-M94Chondropathies
EXCLUDES1:
 postprocedural chondropathies (M96.-)
Chondropathies
M95Other disorders of the musculoskeletal system and connective tissue
M96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
M97Periprosthetic fracture around internal prosthetic joint
M99Biomechanical lesions, not elsewhere classified