M70-M79: Other soft tissue disorders

M77: Other enthesopathies

Enthesopathies, classified under the ICD-10 code group M77, are medical conditions that affect the entheses, which are the points at which tendons or ligaments attach to bone. There are a variety of enthesopathies, but all share features including inflammation, pain, and in some cases, restricted movement. The causes of these conditions can be complex and can include overuse, stress, or strain on the affected area, certain systemic diseases, such as arthritis or wear and tear related to age. Typically, the symptoms worsen during physical activity that stresses the affected tendon or ligament, while rest often brings some relief. Progression of enthesopathies could lead to chronic pain and decreased function of the affected body part if left untreated. They can affect any enthesis but are most commonly found in high-strain areas such as the Achilles tendon, where the tendon connects to the heel.