Chronic secondary temporomandibular myofascial pain (Q91448)

Chronic secondary temporomandibular myofascial pain is chronic pain in the masseter or temporalis muscle(s) attributed to persistent inflammation (due to e.g. infection, crystal deposition or autoimmune disorders), structural changes (such as osteoarthritis or spondylosis), injury, or diseases of the nervous system. It occurs on at least 50% of the days during at least three months. The duration of pain per day is at least 2 hours. Chronic secondary temporomandibular myofascial pain is also termed chronic secondary orofacial muscle pain. If the etiology is vague, consider using codes in the section of chronic primary pain.