Chapter XIII

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

Dorsopathies
(M40-M54)


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-M43)


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
		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