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M99.2 – Subluxation Stenosis of the Neural Canal
M99.2 is an ICD-10 diagnosis code for subluxation stenosis of the neural canal. It describes a narrowing of the spinal canal caused by a partial displacement of a vertebra.
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M99.2 is an ICD-10 diagnosis code for subluxation stenosis of the neural canal. It describes a narrowing of the spinal canal caused by a partial displacement of a vertebra.
Definition
M99.2 is a diagnostic code from the International Classification of Diseases (ICD-10) and stands for Subluxation Stenosis of the Neural Canal. This refers to a narrowing (stenosis) of the spinal canal caused by an incomplete displacement (subluxation) of one vertebra relative to an adjacent vertebra. The result is a reduction in the available space for the spinal cord and the nerve roots branching off from it.
Causes
Subluxation stenosis of the neural canal can be triggered by various factors:
- Degenerative changes: Age-related wear of intervertebral discs, facet joints, or spinal ligaments
- Spondylolisthesis: Forward or backward slipping of a vertebral body
- Traumatic injuries: Accidents or falls causing displacement of vertebral bodies
- Congenital anomalies: Narrowing or malalignment of the spine present from birth
- Chronic inflammation: Conditions such as rheumatoid arthritis that damage the joints of the spine
Symptoms
Symptoms depend on which part of the spine is affected and the degree of narrowing. Common symptoms include:
- Back pain or neck pain, often activity-related
- Radiating pain into the arms or legs (radiculopathy)
- Numbness, tingling, or weakness in the limbs
- Gait disturbances or balance problems in severe cases
- In severe cases: bladder or bowel dysfunction (medical emergency)
Diagnosis
The diagnosis of subluxation stenosis of the neural canal (M99.2) is established through a combination of:
- Clinical examination: Assessment of reflexes, muscle strength, sensation, and range of motion
- Imaging studies: X-rays to assess vertebral alignment, MRI (Magnetic Resonance Imaging) for detailed visualization of the spinal cord, discs, and soft tissues, and CT (Computed Tomography) for bone evaluation
- Neurophysiological testing: Electromyography (EMG) or nerve conduction studies if nerve involvement is suspected
Treatment
Conservative Therapy
For mild to moderate symptoms, conservative treatment is usually recommended first:
- Physiotherapy and targeted spinal strengthening exercises
- Pain management with non-steroidal anti-inflammatory drugs (NSAIDs) or analgesics
- Infiltration therapy (e.g., epidural corticosteroid injections) to reduce nerve inflammation
- Orthopedic aids such as braces or orthoses
Surgical Therapy
Persistent or severe symptoms, nerve damage, or risk of spinal cord injury may require surgical intervention:
- Decompression: Widening of the spinal canal by removing bone or disc material
- Stabilization: Spinal fusion (spondylodesis) of the affected spinal segments
References
- World Health Organization (WHO): International Classification of Diseases, 10th Revision (ICD-10) – Code M99.2 Subluxation stenosis of neural canal. www.who.int
- Koes BW, van Tulder M, Peul WC: Diagnosis and treatment of sciatica. BMJ. 2007;334(7607):1313–1317. doi:10.1136/bmj.39223.428495.BE
- Kreiner DS et al.: Evidence-Based Clinical Guidelines for Multidisciplinary Spine Care: Diagnosis and Treatment of Degenerative Lumbar Spinal Stenosis. North American Spine Society (NASS), 2011.
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