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M65.4 – Stenosing Tenosynovitis (Trigger Finger)
M65.4 is the ICD-10 code for stenosing tenosynovitis, commonly known as trigger finger. The tendon sheath narrows, causing pain and a characteristic snapping or locking when bending the finger.
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M65.4 is the ICD-10 code for stenosing tenosynovitis, commonly known as trigger finger. The tendon sheath narrows, causing pain and a characteristic snapping or locking when bending the finger.
What is M65.4 – Stenosing Tenosynovitis?
The ICD-10 code M65.4 refers to stenosing tenosynovitis, widely known as trigger finger or trigger digit. This condition involves inflammation and narrowing of the tendon sheath surrounding a flexor tendon of the finger. As a result, the tendon can no longer glide smoothly within its sheath, leading to painful catching, clicking, or locking of the affected finger during bending or straightening movements.
Causes
The exact cause of stenosing tenosynovitis is often multifactorial. Common contributing factors include:
- Repetitive hand movements: Prolonged gripping or forceful finger use in occupational or leisure activities
- Underlying medical conditions: Diabetes mellitus, rheumatoid arthritis, and hypothyroidism significantly increase the risk
- Age and sex: Middle-aged and older women are disproportionately affected
- Anatomical changes: Thickening of the A1 pulley (annular ligament) at the base of the finger creates mechanical obstruction of the tendon
Symptoms
Symptoms of M65.4 typically develop gradually and may include:
- Pain and tenderness at the base of the finger, especially over the metacarpophalangeal joint
- Morning stiffness of the affected finger
- A palpable nodule or thickening in the palm
- A snapping or clicking sensation when bending or extending the finger
- In advanced cases: the finger becomes locked in a bent position and can only be straightened passively
- In severe cases: permanent flexion deformity of the finger
Diagnosis
Diagnosis is primarily clinical, based on the patient history and physical examination:
- Patient history regarding symptoms, occupation, and underlying conditions
- Inspection and palpation of the affected finger and palm
- Assessment of active and passive finger range of motion
- Ultrasound imaging if needed, to visualise the tendon sheath and pulley thickening
- Laboratory tests to rule out underlying conditions such as diabetes or rheumatoid arthritis
Treatment
Conservative Treatment
In early stages, non-surgical approaches are preferred:
- Rest and activity modification to reduce repetitive strain on the finger
- Physiotherapy and stretching exercises to improve tendon mobility
- Corticosteroid injection into the tendon sheath: highly effective in many cases, with significant symptom relief
- Splinting of the finger (especially at night) to keep it in an extended position
- Non-steroidal anti-inflammatory drugs (NSAIDs) for acute pain relief
Surgical Treatment
When conservative measures fail, surgical intervention is indicated:
- Open pulley release: The constricting A1 pulley is surgically divided under local anaesthesia – highly effective with excellent long-term outcomes
- Percutaneous pulley release: A minimally invasive needle technique suitable for selected cases
Post-operative physiotherapy is typically recommended to restore full finger function and range of motion.
References
- World Health Organization: ICD-10 Classification of Mental and Behavioural Disorders – M65.4 Stenosing tenosynovitis. WHO, Geneva 2019. www.who.int
- Makkouk A.H. et al.: Trigger finger: etiology, evaluation, and treatment. In: Current Reviews in Musculoskeletal Medicine, 2008; 1(2): 92–96. DOI: 10.1007/s12178-007-9012-1
- Gilberts E.C. et al.: Percutaneous and open trigger finger release: a randomized controlled trial. In: Journal of Hand Surgery (European Volume), 2001; 26(3): 256–260. DOI: 10.1054/jhse.2001.0527
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