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

Spondylopathies
(M45-M49)


M45		Ankylosing spondylitis
		[See site code before M40 ]
		Rheumatoid arthritis of spine
		Excludes:	arthropathy in Reiter's disease ( M02.3 ) Behçet's disease ( M35.2 ) juvenile (ankylosing) spondylitis ( M08.1 )


M46		Other inflammatory spondylopathies
		[See site code before M40 ]
M46.0		Spinal enthesopathy
		Disorder of ligamentous or muscular attachments of spine
M46.1		Sacroiliitis, not elsewhere classified
M46.2		Osteomyelitis of vertebra
M46.3		Infection of intervertebral disc (pyogenic)
		Use additional code (B95-B97), if desired, to identify infectious agent.
M46.4		Discitis, unspecified
M46.5		Other infective spondylopathies
M46.8		Other specified inflammatory spondylopathies
M46.9		Inflammatory spondylopathy, unspecified


M47		Spondylosis
		[See site code before M40 ]
		Includes:	arthrosis or osteoarthritis of spine degeneration of facet joints
M47.0+		Anterior spinal and vertebral artery compression syndromes ( G99.2* )
M47.1		Other spondylosis with myelopathy
		Spondylogenic compression of spinal cord+ ( G99.2* )
		Excludes:	vertebral subluxation ( M43.3-M43.5 )
M47.2		Other spondylosis with radiculopathy
M47.8		Other spondylosis
		Cervical spondylosis Lumbosacral spondylosis Thoracic spondylosis				} } }	without myelopathy or radiculopathy
M47.9		Spondylosis, unspecified


M48		Other spondylopathies
		[See site code before M40 ]
M48.0		Spinal stenosis
		Caudal stenosis
M48.1		Ankylosing hyperostosis [Forestier]
		Diffuse idiopathic skeletal hyperostosis [DISH]
M48.2		Kissing spine
M48.3		Traumatic spondylopathy
M48.4		Fatigue fracture of vertebra
		Stress fracture of vertebra
M48.5		Collapsed vertebra, not elsewhere classified
		Collapsed vertebra NOS Wedging of vertebra NOS
		Excludes:	collapsed vertebra in osteoporosis ( M80.- ) current injury - see injury of spine by body region.
M48.8		Other specified spondylopathies
		Ossification of posterior longitudinal ligament
M48.9		Spondylopathy, unspecified


M49*		Spondylopathies in diseases classified elsewhere
		[See site code before M40 ]
		Excludes:	psoriatic and enteropathic arthropathies ( M07.-* , M09.-* )
M49.0*		Tuberculosis of spine ( A18.0+ )
		Pott's curvature
M49.1*		Brucella spondylitis ( A23.-+ )
M49.2*		Enterobacterial spondylitis ( A01-A04+ )
M49.3*		Spondylopathy in other infectious and parasitic diseases classified elsewhere
		Excludes:	neuropathic spondylopathy in tabes dorsalis ( M49.4* )
M49.4*		Neuropathic spondylopathy
		Neuropathic spondylopathy in: · syringomyelia and syringobulbia ( G95.0+ ) · tabes dorsalis ( A52.1+ )
M49.5*		Collapsed vertebra in diseases classified elsewhere
		Metastatic fracture of vertebra ( C79.5+ )
M49.8*		Spondylopathy in other diseases classified elsewhere