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M46.4 – Infective Intervertebral Disc Disorder
M46.4 is the ICD-10 code for infective intervertebral disc disorders. Bacteria or other pathogens infect the disc space, causing inflammation, pain, and potentially serious complications.
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M46.4 is the ICD-10 code for infective intervertebral disc disorders. Bacteria or other pathogens infect the disc space, causing inflammation, pain, and potentially serious complications.
What Does the ICD-10 Code M46.4 Mean?
The ICD-10 code M46.4 refers to discitis, unspecified – an infective inflammation of the intervertebral discs of the spine. It belongs to the group of inflammatory spondylopathies and is most commonly caused by a bacterial infection, though fungi and other microorganisms can also be responsible. The infection affects the disc space and frequently involves the adjacent vertebral bodies and surrounding soft tissue.
Causes
The most common cause of M46.4 is a bacterial infection that reaches the disc through the bloodstream (haematogenous spread). Less frequently, infection arises from direct spread following spinal surgery or trauma. Common causative organisms include:
- Staphylococcus aureus (most frequent pathogen)
- Streptococci
- Escherichia coli and other gram-negative bacteria
- Mycobacterium tuberculosis (in tuberculous forms)
- Fungi such as Candida species (particularly in immunocompromised individuals)
Known risk factors include:
- Diabetes mellitus
- Immunosuppression (e.g., from medications or HIV infection)
- Intravenous drug use
- Prior spinal surgery or interventional procedures
- Endocarditis or other systemic bacterial infections
Symptoms
The clinical presentation of M46.4 often develops gradually and may initially be non-specific. Typical symptoms include:
- Back pain, often severe and worsened by movement
- Localised tenderness over the affected spinal region
- Fever and general malaise
- Restricted spinal mobility
- In severe cases: neurological deficits such as numbness, weakness, or paralysis (if the spinal cord or nerve roots are involved)
Diagnosis
Diagnosing infective discitis requires a combination of clinical assessment, laboratory tests, and imaging:
- Blood tests: Elevated inflammatory markers (CRP, ESR, white blood cell count)
- Blood cultures: To identify the causative pathogen
- MRI of the spine: Gold standard for early detection; clearly shows inflammation and the extent of involvement
- CT-guided biopsy: For targeted microbiological sampling from the affected disc space
- X-ray and CT: Supplementary but less sensitive in early disease stages
Treatment
Treatment depends on the identified or most likely pathogen and the clinical severity of the condition:
Pharmacological Treatment
The primary treatment involves antibiotics selected according to the pathogen and sensitivity testing. Initial intravenous therapy is recommended, followed by oral maintenance treatment for several weeks to months. In cases of fungal infection, antifungal agents (e.g., fluconazole, amphotericin B) are used instead.
Immobilisation and Physical Measures
Temporary spinal immobilisation (e.g., using a brace or orthosis) may help relieve pain and stabilise the spine. Bed rest is only advised in severe cases.
Surgical Treatment
Surgery is indicated when:
- Neurological deficits are present or worsening
- An abscess (e.g., epidural abscess) has formed
- Spinal instability is detected
- Conservative therapy has failed
Surgical intervention typically involves drainage of the infectious focus, decompression of neural structures, and stabilisation of the spine if needed.
Prognosis
With early diagnosis and consistent treatment, the prognosis of M46.4 is generally favourable. However, delayed therapy can lead to permanent damage to the spine and nervous system. Regular clinical and laboratory follow-up examinations are essential throughout the course of treatment.
References
- Zimmerli W. - Vertebral Osteomyelitis. New England Journal of Medicine, 2010; 362(11):1022–1029.
- World Health Organization (WHO): ICD-10 Classification of Mental and Behavioural Disorders – Code M46.4.
- Berbari E. F., Kanj S. S., Kowalski T. J. et al. - 2015 Infectious Diseases Society of America (IDSA) Clinical Practice Guidelines for the Diagnosis and Treatment of Native Vertebral Osteomyelitis in Adults. Clinical Infectious Diseases, 2015; 61(6):e26–e46.
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