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M60.1 Interstitial Myositis – Causes & Treatment
M60.1 is the ICD-10 code for interstitial myositis, an inflammatory condition of skeletal muscle affecting the connective tissue between muscle fibres. It causes pain, weakness and reduced mobility.
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M60.1 is the ICD-10 code for interstitial myositis, an inflammatory condition of skeletal muscle affecting the connective tissue between muscle fibres. It causes pain, weakness and reduced mobility.
What is M60.1 – Interstitial Myositis?
M60.1 is the ICD-10 diagnosis code for interstitial myositis, an inflammatory disease of the skeletal muscles. In this form of myositis, the inflammation primarily affects the connective tissue between muscle fibres (the interstitium), which distinguishes it from other types of myositis that mainly target the muscle fibres themselves.
Causes
The causes of interstitial myositis are diverse and not always clearly identifiable:
- Autoimmune reactions: The immune system mistakenly attacks the body's own muscle tissue.
- Infections: Bacterial or viral infections can trigger inflammatory responses in muscle tissue.
- Medication side effects: Certain drugs, such as statins, can promote muscle inflammation.
- Systemic diseases: Rheumatic or connective tissue disorders such as lupus or scleroderma may be associated with interstitial myositis.
- Idiopathic: In some cases, no specific cause can be identified.
Symptoms
Symptoms may develop gradually and vary in severity:
- Muscle pain (myalgia), often symmetrical
- Muscle weakness, particularly in the shoulders, upper arms, hips and thighs
- Increased muscle fatigue during daily activities
- Swelling or tenderness in the affected muscle area
- In severe cases: limited range of motion and functional impairment
- General symptoms such as fatigue, fever or unintended weight loss may occur
Diagnosis
Diagnosing interstitial myositis requires a thorough clinical and laboratory evaluation:
- Blood tests: Elevated muscle enzymes such as creatine kinase (CK), lactate dehydrogenase (LDH) and aldolase indicate muscle damage. Inflammatory markers (CRP, ESR) may also be elevated.
- Autoantibody testing: Specific autoantibodies (e.g. anti-Jo-1) can point to an autoimmune cause.
- Electromyography (EMG): Measures electrical activity in muscles to assess muscle damage.
- MRI of muscles: Imaging to visualise areas of inflammation within muscle tissue.
- Muscle biopsy: A small tissue sample is taken for histological examination – considered the gold standard for diagnosis.
Treatment
Treatment depends on the underlying cause, disease severity and individual patient factors:
Pharmacological Treatment
- Corticosteroids (e.g. prednisone) are typically the first-line treatment to reduce inflammation.
- Immunosuppressants such as methotrexate, azathioprine or mycophenolate are used in severe or chronic cases.
- Biologics (e.g. rituximab) may be considered in treatment-resistant cases.
Physiotherapy and Rehabilitation
- Targeted muscle training to maintain and improve muscle strength
- Physiotherapy to prevent contractures and preserve mobility
Treatment of the Underlying Condition
If a systemic disease or infection is identified as the cause, it must be treated specifically and directly.
Prognosis
The course of interstitial myositis varies widely. Some patients respond well to treatment and achieve complete remission. Others may experience a chronic course requiring repeated treatment cycles. Early diagnosis and consistent therapy significantly improve long-term outcomes.
References
- World Health Organization: ICD-10 Classification of Mental and Behavioural Disorders – M60.1 Interstitial myositis, WHO, Geneva.
- Dalakas MC. Inflammatory muscle diseases. New England Journal of Medicine. 2015;372(18):1734-1747.
- European League Against Rheumatism (EULAR): Recommendations for the management of idiopathic inflammatory myopathies, 2017.
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