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Things worth knowing about "G57.3"

G57.3 is the ICD-10 code for meralgia paraesthetica, a nerve condition causing tingling, numbness, and burning pain along the outer thigh.

What does ICD-10 Code G57.3 mean?

The ICD-10 code G57.3 refers to meralgia paraesthetica (also spelled meralgia paresthetica), a condition affecting the peripheral nervous system. It involves compression or irritation of the lateral femoral cutaneous nerve, a purely sensory nerve that supplies the skin over the outer and front surface of the thigh. When this nerve is compressed, it causes characteristic sensory disturbances in the affected area.

Causes

The most common cause is mechanical compression of the lateral femoral cutaneous nerve as it passes under or through the inguinal ligament. Common contributing factors include:

Obesity or rapid weight gain
Tight clothing, belts, or seatbelts
Prolonged standing or walking
Pregnancy
Diabetes mellitus
Injury or surgery in the hip or groin region
Intense physical activity or muscle overuse

Symptoms

Symptoms of G57.3 are confined to the skin of the outer and front thigh. Typical complaints include:

Tingling or numbness (paraesthesias)
Burning or stabbing pain
Increased skin sensitivity (hypersensitivity)
Sensations of warmth or cold without an obvious cause
No muscle weakness, as the nerve is purely sensory

Symptoms often worsen with prolonged standing or walking and may improve when lying down.

Diagnosis

Diagnosis is primarily clinical, based on the patient history and physical examination. Additional diagnostic tools may include:

Neurological examination: Assessment of sensation in the affected area
Electromyography (EMG) and nerve conduction studies (NCS): To evaluate nerve function
Imaging (MRI or ultrasound): To rule out other causes such as tumours or hernias
Diagnostic nerve block: Local anaesthesia of the nerve can confirm the diagnosis

Treatment

Treatment depends on the severity of symptoms and the underlying cause.

Conservative Measures

Eliminating contributing factors (e.g., avoiding tight clothing, weight loss)
Physiotherapy to relieve tension on the inguinal ligament
Pain relief with non-steroidal anti-inflammatory drugs (NSAIDs)
Neuropathic pain medications such as gabapentin or pregabalin

Interventional Treatment

Local corticosteroid injection: An injection of a corticosteroid and local anaesthetic near the nerve can provide significant relief

Surgical Treatment

In rare, severe cases, surgical nerve decompression or neurectomy (nerve section) may be considered

For most patients, symptoms improve significantly with conservative management within a few months.

References

World Health Organization (WHO): ICD-10 Version 2019, Code G57.3 - Meralgia paraesthetica. Geneva: WHO.
Harney, D. & Patijn, J. (2007): Meralgia paresthetica: diagnosis and management strategies. Pain Medicine, 8(8), 669-677. PubMed PMID: 18028045.
Latinovic, R., Gulliford, M. C. & Hughes, R. A. (2006): Incidence of common compressive neuropathies in primary care. Journal of Neurology, Neurosurgery & Psychiatry, 77(2), 263-265.

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