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M65.3 Trigger Finger – Causes & Treatment
M65.3 is the ICD-10 code for trigger finger (stenosing tenosynovitis), a condition in which a finger catches or locks when bent or straightened.
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M65.3 is the ICD-10 code for trigger finger (stenosing tenosynovitis), a condition in which a finger catches or locks when bent or straightened.
What is M65.3 – Trigger Finger?
The ICD-10 code M65.3 refers to stenosing tenosynovitis, commonly known as trigger finger. In this condition, the tendon sheath or the annular pulley (a ring-shaped ligament) around a flexor tendon becomes thickened or inflamed, preventing the tendon from gliding smoothly. As a result, the affected finger snaps, clicks, or locks when bent or straightened – similar to the action of a trigger, which gives the condition its common name.
Causes
The exact cause is not always clear. Commonly associated factors include:
- Repetitive hand movements and overuse of the flexor tendons (e.g., in manual work or prolonged computer use)
- Inflammatory conditions such as rheumatoid arthritis
- Metabolic disorders such as diabetes mellitus or thyroid disease
- Anatomical variations in the pulley system of the finger
- Idiopathic onset (no identifiable cause) in some cases
Symptoms
Typical symptoms of M65.3 include:
- Pain and tenderness at the base of the affected finger, especially over the metacarpophalangeal joint
- Audible or palpable snapping, catching, or locking of the finger during flexion or extension
- Morning stiffness of the finger
- In advanced cases: the finger becoming fixed in a bent or straight position
- A palpable nodule or swelling at the base of the finger
Diagnosis
Trigger finger is typically diagnosed clinically through a physical examination. The characteristic snapping or locking during active finger movement is usually sufficient for diagnosis. An ultrasound examination may be used to visualize thickening of the tendon sheath or pulley and to rule out other causes. Blood tests may be ordered to identify underlying conditions such as diabetes or rheumatic disease.
Treatment
Conservative Treatment
In mild to moderate cases, non-surgical management is the first approach:
- Rest and splinting of the affected finger
- Anti-inflammatory medications (NSAIDs) to reduce pain and swelling
- Corticosteroid injections into the tendon sheath – often highly effective, especially for first-time treatment
- Physiotherapy and targeted exercises
Surgical Treatment
If symptoms persist or the finger becomes completely locked, surgical release of the annular pulley (pulley release) may be required. This procedure is commonly performed on an outpatient basis under local anaesthesia and generally yields excellent long-term results. A minimally invasive, percutaneous technique is also available in many centres.
Prognosis
The overall prognosis for M65.3 is favourable. Many patients respond well to corticosteroid injections. Recurrence after surgical treatment is uncommon. Early intervention typically prevents permanent loss of finger function.
References
- Makkouk AH et al. – Trigger finger: etiology, evaluation, and treatment. Current Reviews in Musculoskeletal Medicine, 2008;1(2):92-96. PubMed PMID: 19468879.
- Wolfe SW et al. (eds.): Green's Operative Hand Surgery, 7th edition. Elsevier, 2017. Chapter: Stenosing Tenosynovitis.
- World Health Organization: ICD-10 Version 2019 – M65.3 Trigger finger. Available at: https://icd.who.int/browse10/2019/en
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