Chapter XIII

Diseases of the musculoskeletal system and connective tissue


The following supplementary subclassification to indicate the site of involvement is provided for optional use with appropriate categories in the block on dorsopathies, except categories M50 and M51; see also note at the beginning of this chapter.
0 Multiple sites in spine
1 Occipito-atlanto-axial region
2 Cervical region
3 Cervicothoracic region
4 Thoracic region
5 Thoracolumbar region
6 Lumbar region
7 Lumbosacral region
8 Sacral and sacrococcygeal region
9 Site unspecified

Deforming dorsopathies

M40 Kyphosis and lordosis
[See site code before M40 ]
Excludes: kyphoscoliosis ( M41.- )
kyphosis and lordosis:
· congenital ( Q76.4 )
· postprocedural ( M96.- )
M40.0 Postural kyphosis
Excludes: osteochondrosis of spine ( M42.- )
M40.1 Other secondary kyphosis
M40.2 Other and unspecified kyphosis
M40.3 Flatback syndrome
M40.4 Other lordosis
· acquired
· postural
M40.5 Lordosis, unspecified

M41 Scoliosis
[See site code before M40 ]
Includes: kyphoscoliosis
Excludes: congenital scoliosis:
· NOS ( Q67.5 )
· due to bony malformation ( Q76.3 )
· postural ( Q67.5 )
kyphoscoliotic heart disease ( I27.1 )
postprocedural ( M96.- )
M41.0 Infantile idiopathic scoliosis
M41.1 Juvenile idiopathic scoliosis
Adolescent scoliosis
M41.2 Other idiopathic scoliosis
M41.3 Thoracogenic scoliosis
M41.4 Neuromuscular scoliosis
Scoliosis secondary to cerebral palsy, Friedreich's ataxia, poliomyelitis, and other neuromuscular disorders.
M41.5 Other secondary scoliosis
M41.8 Other forms of scoliosis
M41.9 Scoliosis, unspecified

M42 Spinal osteochondrosis
[See site code before M40 ]
Excludes: postural kyphosis ( M40.0 )
M42.0 Juvenile osteochondrosis of spine
Calvé's disease
Scheuermann's disease
Excludes: postural kyphosis ( M40.0 )
M42.1 Adult osteochondrosis of spine
M42.9 Spinal osteochondrosis, unspecified

M43 Other deforming dorsopathies
[See site code before M40 ]
Excludes: congenital spondylolysis and spondylolisthesis ( Q76.2 )
hemivertebra ( Q76.3-Q76.4 )
Klippel-Feil syndrome ( Q76.1 )
lumbarization and sacralization ( Q76.4 )
platyspondylisis ( Q76.4 )
spina bifida occulta ( Q76.0 )
spinal curvature in:
· osteoporosis ( M80-M81 )
· Paget's disease of bone [osteitis deformans] ( M88.- )
M43.0 Spondylolysis
M43.1 Spondylolisthesis
M43.2 Other fusion of spine
Ankylosis of spinal joint
Excludes: ankylosing spondylitis ( M45 )
arthrodesis status ( Z98.1 )
pseudoarthrosis after fusion or arthrodesis ( M96.0 )
M43.3 Recurrent atlantoaxial subluxation with myelopathy
M43.4 Other recurrent atlantoaxial subluxation
M43.5 Other recurrent vertebral subluxation
Excludes: biomechanical lesions NEC ( M99.- )
M43.6 Torticollis
Excludes: torticollis:
· congenital (sternomastoid) ( Q68.0 )
· current injury - see injury of spine by body region
· due to birth injury ( P15.2 )
· psychogenic ( F45.8 )
· spasmodic ( G24.3 )
M43.8 Other specified deforming dorsopathies
Excludes: kyphosis and lordosis ( M40.- )
scoliosis ( M41.- )
M43.9 Deforming dorsopathy, unspecified
Curvature of spine NOS