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M60.8 – Other Myositis: Causes & Treatment
M60.8 is the ICD-10 code for other myositis – inflammatory conditions of skeletal muscle not classified elsewhere. Common causes include autoimmune disorders, medications, and infections.
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M60.8 is the ICD-10 code for other myositis – inflammatory conditions of skeletal muscle not classified elsewhere. Common causes include autoimmune disorders, medications, and infections.
What is M60.8?
The ICD-10 code M60.8 refers to other myositis – inflammatory diseases of the skeletal muscles that do not fit into more specific subcategories such as infectious myositis (M60.0) or interstitial myositis (M60.1). The term myositis derives from the Greek words “mys” (muscle) and “itis” (inflammation), and describes a group of conditions characterized by muscle inflammation of varying causes.
Causes
Myositis classified under M60.8 can result from a range of underlying factors:
- Autoimmune processes: The immune system mistakenly attacks muscle tissue, as seen in dermatomyositis or inclusion body myositis.
- Medications and substances: Statins, corticosteroids, or certain antibiotics can trigger drug-induced myositis.
- Infections: Viral (e.g., influenza, COVID-19), bacterial, or parasitic infections can lead to muscle inflammation.
- Physical causes: Overexertion, trauma, or repetitive muscle injury.
- Paraneoplastic processes: Underlying malignancies may indirectly cause muscle inflammation.
Symptoms
Symptoms of M60.8 vary depending on the cause and severity of the inflammation:
- Muscle pain (myalgia), often exacerbated by activity or present at rest
- Muscle weakness, particularly in proximal muscle groups (shoulders, hips)
- Muscle swelling and tenderness on palpation
- General malaise, fatigue, and fever (especially in infectious cases)
- In severe cases: rhabdomyolysis (breakdown of muscle tissue) with dark-colored urine
Diagnosis
Diagnosing myositis under M60.8 involves several steps:
- Blood tests: Elevated muscle enzymes such as creatine kinase (CK), lactate dehydrogenase (LDH), and aldolase; inflammatory markers (CRP, ESR)
- Autoantibody testing: e.g., anti-Jo-1, anti-Mi-2 when autoimmune myositis is suspected
- Imaging: MRI of affected muscles to identify areas of inflammation
- Electromyography (EMG): Assessment of electrical muscle activity
- Muscle biopsy: Tissue examination to confirm diagnosis and distinguish between types of myositis
Treatment
Treatment depends on the underlying cause of the myositis:
- Autoimmune myositis: Corticosteroids (e.g., prednisolone) as first-line therapy; immunosuppressants such as methotrexate, azathioprine, or rituximab if response is insufficient
- Drug-induced myositis: Discontinuation of the causative medication
- Infectious myositis: Antibiotics, antivirals, or antiparasitic agents depending on the pathogen
- Physiotherapy: Targeted muscle rehabilitation to restore strength and function
- Pain management: Nonsteroidal anti-inflammatory drugs (NSAIDs) for symptomatic relief
Prognosis
The prognosis for M60.8 largely depends on the underlying cause. Drug-induced and infectious myositis often resolve completely once the cause is treated. Autoimmune forms may require long-term therapy but can be well managed with early intervention and appropriate treatment.
References
- World Health Organization – ICD-10 Classification of Diseases, 10th Revision, Chapter M60: Myositis. who.int
- Dalakas MC. – Inflammatory muscle diseases. New England Journal of Medicine. 2015;372(18):1734–1747.
- Lundberg IE, Tjarnlund A, Bottai M et al. – 2017 European League Against Rheumatism/American College of Rheumatology Classification Criteria for Adult and Juvenile Idiopathic Inflammatory Myopathies. Annals of the Rheumatic Diseases. 2017;76(12):1955–1964.
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