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G56.0 – Carpal Tunnel Syndrome: Causes & Treatment
G56.0 is the ICD-10 code for carpal tunnel syndrome, a common nerve compression disorder at the wrist causing numbness, tingling, and pain in the hand.
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G56.0 is the ICD-10 code for carpal tunnel syndrome, a common nerve compression disorder at the wrist causing numbness, tingling, and pain in the hand.
What does ICD-10 code G56.0 mean?
The ICD-10 code G56.0 refers to carpal tunnel syndrome (CTS), one of the most common peripheral nerve compression disorders. The median nerve, which runs through a narrow passageway in the wrist called the carpal tunnel, becomes compressed, causing a characteristic set of symptoms in the hand and fingers.
Causes
Carpal tunnel syndrome results from increased pressure within the carpal tunnel, a rigid canal formed by the wrist bones and a tough ligament. Common causes and risk factors include:
- Repetitive or prolonged hand and wrist use (e.g., typing, assembly work)
- Hormonal changes (e.g., pregnancy, hypothyroidism)
- Inflammatory conditions such as rheumatoid arthritis
- Diabetes mellitus
- Fluid retention or edema
- Wrist injuries or bone abnormalities
- Idiopathic (no identifiable cause)
Symptoms
Symptoms of G56.0 typically affect the thumb, index, middle, and half of the ring finger:
- Tingling and numbness in the fingers, often worse at night or in the early morning
- Pain that may radiate to the forearm or shoulder
- Weakness and clumsiness of the hand
- In advanced cases: wasting of the thenar muscles at the base of the thumb (thenar atrophy)
- Relief of symptoms by shaking the hand (the so-called "flick sign")
Diagnosis
Diagnosis of carpal tunnel syndrome is based on:
- Clinical examination: Phalen's test (sustained wrist flexion), Tinel's sign (tapping over the carpal tunnel)
- Nerve conduction studies (NCS): Measurement of median nerve conduction velocity – considered the diagnostic gold standard
- Ultrasound of the wrist to assess median nerve swelling
- MRI in complex or unclear cases
Treatment
Conservative Treatment
For mild to moderate cases, non-surgical management is recommended:
- Wrist splinting, especially at night, to keep the wrist in a neutral position
- Corticosteroid injections into the carpal tunnel to reduce inflammation
- Physical therapy and ergonomic adjustments
- Treatment of underlying conditions (e.g., diabetes, thyroid disease)
Surgical Treatment
When symptoms are severe or persistent, carpal tunnel release surgery (surgical decompression of the median nerve) is indicated. The procedure can be performed via open or endoscopic technique and has a high success rate. Most patients experience significant improvement or complete resolution of symptoms following surgery.
Prognosis
With timely treatment, the prognosis for carpal tunnel syndrome is generally very good. However, long-standing nerve compression without treatment may result in permanent sensory loss or muscle weakness. Early diagnosis and appropriate management are therefore essential.
References
- Bland JD. Carpal tunnel syndrome. BMJ. 2007;335(7615):343–346. doi:10.1136/bmj.39282.623553.AD
- American Academy of Orthopaedic Surgeons (AAOS): Clinical Practice Guideline on the Management of Carpal Tunnel Syndrome, 2016. Available at: www.aaos.org
- WHO ICD-10 Classification of Diseases – Code G56.0, World Health Organization, Geneva.
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