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M51.2 – Lumbar Disc Herniation ICD-10

M51.2 is an ICD-10 code for displacement of intervertebral discs in the lumbar and sacral region without myelopathy, commonly known as a lumbar disc herniation or slipped disc.

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Things worth knowing about "M51.2"

M51.2 is an ICD-10 code for displacement of intervertebral discs in the lumbar and sacral region without myelopathy, commonly known as a lumbar disc herniation or slipped disc.

What Does the Diagnosis M51.2 Mean?

The ICD-10 code M51.2 refers to displacement of intervertebral discs of other and unspecified parts of the spine, without myelopathy – most commonly affecting the lumbar and sacral spine. In clinical practice, this code is frequently assigned for a lumbar disc herniation, a condition in which disc material protrudes from its normal position and may irritate or compress adjacent nerve structures.

The term without myelopathy indicates that the spinal cord itself is not damaged – unlike more severe forms of disc herniation where spinal cord involvement is present.

Causes

Intervertebral disc displacement can result from a variety of factors:

Degenerative changes: With age, discs lose water content and elasticity, making them more prone to herniation.
Physical strain: Heavy lifting, poor posture, or repetitive loading of the spine can contribute to disc displacement.
Trauma: Accidents or sudden movements can trigger an acute disc herniation.
Genetic predisposition: A family history of disc problems is a recognized risk factor.
Sedentary lifestyle and excess body weight: Inadequate muscle support and increased spinal load worsen the risk.

Symptoms

Symptoms vary depending on the extent and location of the displacement:

Back pain: Often unilateral, frequently radiating into the buttock and leg (sciatica).
Numbness and tingling: Abnormal sensations in the leg or foot, depending on the affected nerve root.
Muscle weakness: Reduced strength in specific leg muscles when nerve compression is significant.
Pain worsening with activity: Coughing, sneezing, or prolonged sitting can intensify symptoms.

Diagnosis

The following methods are used to confirm the diagnosis:

Clinical examination: Assessment of reflexes, sensation, and muscle strength, along with specific tests such as the straight leg raise (Lasegue test).
MRI (Magnetic Resonance Imaging): The gold standard for visualizing disc herniations and nerve root involvement.
CT (Computed Tomography): Used as a complement to assess bony structures.
X-ray: To exclude other causes such as fractures or tumors.

Treatment

Conservative Treatment

In the majority of cases, symptoms improve without surgery:

Physiotherapy and targeted exercise: Strengthening the back and abdominal muscles to relieve spinal pressure.
Pain management: Use of analgesics (e.g., NSAIDs such as ibuprofen) and, if needed, muscle relaxants.
Heat and cold therapy: For short-term relief of pain and muscle tension.
Injection therapy: Periradicular corticosteroid injections near the affected nerve root for severe symptoms.

Surgical Treatment

Surgery is indicated when:

Severe or progressive neurological deficits are present (e.g., motor paralysis).
Bladder or bowel dysfunction occurs (cauda equina syndrome – a medical emergency).
Conservative treatment fails to provide adequate relief after several weeks.

Surgical options include microdiscectomy (microsurgical removal of the herniated disc fragment) and endoscopic techniques.

Prognosis and Course

The prognosis for M51.2 is generally favorable. Up to 90 % of patients recover within 6 to 12 weeks with conservative management. Recurrence is possible; regular back exercise and strengthening programs can help reduce the risk of relapse.

References

World Health Organization – ICD-10 Classification of Mental and Behavioural Disorders. Geneva: WHO, 2019.
German Neurological Society (DGN) – Guideline: Lumbar Radiculopathy (2023), available at www.dgn.org.
Koes BW, van Tulder M, Peul WC – Diagnosis and treatment of sciatica. BMJ 2007;334(7607):1313–1317.

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