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


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