M60: Myositis

M60.8: Other myositis

Myositis refers to any condition causing inflammation in the muscles. Weakness, swelling, and pain are the most common myositis symptoms. The inflammation can be part of a systemic (whole body) disease, such as rheumatoid arthritis or lupus, or it can be an isolated event. 'Other myositis' under the ICD-10 code M60.8 refers to less common forms of myositis which may not fit into the traditional categories. This could include rare types or myositis caused by unusual factors. It can affect people of any age, even though certain forms are more common at certain life stages. The affected muscle may appear to be red and swollen, and it can often be tender to the touch. The exact cause of other myositis is often unknown, but it can sometimes be traced to a reaction to a drug or an infection.